Assoc.Prof. kand. Sergey Borisov
Groupleader of Chemosensors and Biosensors
Phone: +43 (316) 873 - 32516
EMail: sergey.borisov@tugraz.at
Topics: Chemosensors and Biosensors
Articles in peer reviewed journals
2021
Combining metalloporphyrins and cyclometalated complexes – A luminous pair?
Journal of Photochemistry and Photobiology / A
407,
2021
Fluorescent 1-hydroxy-10-alkylacridin-9(10H)-one BF2-chelates
Dyes and Pigments
184,
2021
2020
Optical Sensing and Imaging of pH Values: Spectroscopies, Materials, and Applications
Chemical Reviews
120,
12357-12489,
2020
Zn(II) Schiff Bases: Bright TADF Emitters for Self-referenced Decay Time-Based Optical Temperature Sensing
ACS Omega
5,
7729–7737,
2020
TADF-Emitting Zn(II)-Benzoporphyrin: An Indicator for Simultaneous Sensing of Oxygen and Temperature
ACS Sensors
5,
1020–1027,
2020
Comparison of fluorene, silafluorene and carbazole as linkers in perylene monoimide based non-fullerene acceptors
Materials Advances
1,
2095-2106,
2020
Fatty acids as biomimetic replication agents for luminescent metal-organic framework patterns
Chemical Communications
56,
12733-12736,
2020
Fast Oxygen Scavenging of Macroporous Poly(Norbornadiene) Prepared by Ring‐Opening Metathesis Polymerization
Macromolecular Rapid Communications
41,
1900423,
2020
Everlasting rhodamine dyes and true deciding factors in their STED microscopy performance
Photochemical and Photobiological Sciences
19,
1677-1689,
2020
Green to red emitting BODIPY dyes for fluorescent sensing and imaging of carbon dioxide
Sensors and Actuators / B, Chemical
304,
2020
Use of an oxygen planar optode to assess the effect of high velocity microsprays on oxygen penetration in a human dental biofilms in-vitro
BMC Oral Health
20,
2020
Amphiphilic Rhenium-Oxo Corroles as a New Class of Sensitizers for Photodynamic Therapy
ACS Omega
5,
10596-10601,
2020
Iridium Corroles Exhibit Weak Near-Infrared Phosphorescence but Efficiently Sensitize Singlet Oxygen Formation
Scientific Reports
10,
2020
Rhenium-Imido Corroles
Inorganic Chemistry
59,
6382-6389,
2020
Tuning the sensitivity of fluoroionophore-based K+ sensors via variation of polymer matrix
Sensors and Actuators, B: Chemical
312,
2020
Multiparametric Optical Bioimaging Reveals the Fate of Epoxy Crosslinked Biomeshes in the Mouse Subcutaneous Implantation Model
Frontiers in Bioengineering and Biotechnology
8,
2020
Bright far-red emitting BODIPYs via extension with conjugated fluorene and carbazole motifs
Dyes and Pigments
174,
2020
Evaluation of Ebselen-azadioxatriangulenium as redox-sensitive fluorescent intracellular probe and as indicator within a planar redox optode
Dyes and Pigments
173,
2020
2019
Deactivation of redox mediators in lithium-oxygen batteries by singlet oxygen
Nature Communications
10,
1380,
2019
DABCOnium: An Efficient and High‐voltage Stable Singlet Oxygen Quencher for Metal‐O2 Cells
Angewandte Chemie / International Edition
58,
6535-6539,
2019
Optical sensing of ph and o2 in the evaluation of bioactive self-healing cement
ACS Omega
4,
20237-20243,
2019
Platinum(ii) and palladium(ii) complexes with electron-deficient
Dalton Transactions
48,
8882-8898,
2019
Ambient-temperature near-IR phosphorescence and potential applications of rhenium-oxo corroles
Photochemical and Photobiological Sciences
18,
1166-1170,
2019
Near-infrared fluorescent aza-BODIPY dyes for sensing and imaging of pH from the neutral to highly alkaline range
Analyst
144,
2393-2402,
2019
Luminescence Lifetime Imaging of Chemical Sensors - A Comparison between Time-Domain and Frequency-Domain Based Camera Systems
Analytical Chemistry
91,
3233-3238,
2019
Background-Free Fluorescence-Decay-Time Sensing and Imaging of pH with Highly Photostable Diazaoxotriangulenium Dyes
Analytical Chemistry
91,
808-816,
2019
Fast and stable optical pH sensor materials for oceanographic applications
Sensors and Actuators, B: Chemical
282,
204-217,
2019
High-resolution optical pH imaging of concrete exposed to chemically corrosive environments
Cement and Concrete Research
116,
231-237,
2019
2018
A versatile optode system for oxygen, carbon dioxide, and pH measurements in seawater with integrated battery and logger
Limnology and Oceanography / Methods
16,
459-473,
2018
The Janus-faced chromophore
Chemical Communications
54,
1607-1610,
2018
A validation and comparison study of new, compact, versatile optodes for oxygen, pH and carbon dioxide in marine environments
Marine Chemistry
207,
63-76,
2018
Mn4+-Doped magnesium titanate-a promising phosphor for self-referenced optical temperature sensing
Sensors
18,
2018
Stable Platinum(IV) Corroles
ACS Omega
3,
9360-9368,
2018
Ultrabright Red-Emitting Photostable Perylene Bisimide Dyes
Chemistry - a European Journal
24,
10711-10720,
2018
New red-emitting Schiff base chelates
Journal of Materials Chemistry / C
6,
8999-9009,
2018
Gene expression of terminal oxidases in two marine bacterial strains exposed to nanomolar oxygen concentrations
FEMS Microbiology Ecology
94,
2018
Ammonia sensing with fluoroionophores – A promising way to minimize interferences caused by volatile amines
Sensors and Actuators / B, Chemical
255,
1897-1901,
2018
Optical Ammonia Sensor for Continuous Bioprocess Monitoring
Proceedings / Electrochemical Society
,
2018
NIR Phosphorescent Intramolecularly Bridged Benzoporphyrins and their Application in Oxygen-Compensated Glucose Optode
Analytical Chemistry
90,
2018
Tuning photophysical properties of phosphorescent benzoporphyrin complexes via 1-step π-extension
Dyes and Pigments
2018,
610-618,
2018
Wide-range optical pH imaging of cementitious materials exposed to chemically corrosive environments
RILEM Technical Letters
3,
39-45,
2018
2017
Sodium-Selective Fluoroionophore-based Optodes for Seawater Salinity Measurements
Analytical Chemistry
2017,
7195-7202,
2017
Electron-Deficient Near-Infrared Pt(II) and Pd(II) Benzoporphyrins with Dual Phosphorescence and Unusually Efficient Thermally Activated Delayed Fluorescence: First Demonstration of Simultaneous Oxygen and Temperature Sensing with a Single Emitter
ACS Applied Materials & Interfaces
2017,
2017
Nanoparticle-Based Fluoroionophore for Analysis of Potassium Ion Dynamics in 3D Tissue Models and In Vivo
Advanced Functional Materials
2017,
2017
Singlet Oxygen during Cycling of the Aprotic Sodium–O2 Battery
Angewandte Chemie / International Edition
56,
15728-15732,
2017
Singulett-Sauerstoff in der aprotischen Natrium-O2-Batterie
Angewandte Chemie
129,
15934 –15938,
2017
Structure and spectroscopic properties of porphyrinato group 14 derivatives: Part I - Phenylacetylido ligands
Zeitschrift für Naturforschung / B
2017,
801-811,
2017
Room-Temperature-Phosphorescence-Based Dissolved Oxygen Detection by Core-Shell Polymer Nanoparticles Containing Metal-Free Organic Phosphors
Angewandte Chemie / International Edition
56,
16207-16211,
2017
Singlet oxygen generation as a major cause for parasitic reactions during cycling of aprotic lithium-oxygen batteries
Nature Energy
2,
2017
Integrating chemical imaging of cationic trace metal solutes and pH into a single hydrogel layer
Analytica Chimica Acta
950,
88-97,
2017
Photostable upconverting and downconverting pH sensors based on combination of a colorimetric NIR indicator and stable inorganic phosphors as secondary emitters
Sensors and Actuators, B: Chemical
245,
972-979,
2017
Trace Ammonia Sensors Based on Fluorescent Near-Infrared-Emitting aza-BODIPY Dyes
Analytical Chemistry
89,
2859-2865,
2017
Purely Organic Dyes with Thermally Activated Delayed Fluorescence—A Versatile Class of Indicators for Optical Temperature Sensing
Advanced Optical Materials
2017,
2017
2016
Simultaneous determination of oxygen and pH inside microfluidic devices using core-shell nanosensors
Analytical Chemistry
88,
9796–9804,
2016
Red- to NIR-Emitting, BODIPY-Based, K+-Selective Fluoroionophores and Sensing Materials
Advanced Functional Materials
26,
7697-7707,
2016
Highly sensisitive poisoning-resistant optical carbon dioxide sensors for environmental monitoring
Analytical Methods
2016,
2016
Measurement of oxygen transfer from air into organic solvents.
Journal of chemical technology & biotechnology
91,
2016
Continuous on-chip fluorescence labelling, free-flow isoelectric focusing and marker-free isoelectric point determination of proteins and peptides
Lab on a chip - miniaturisation for chemistry and biology
,
2016
2015
NIR-emitting aza-BODIPY dyes – new building blocks for broad-range optical pH sensors
Analyst
140,
7150-7153,
2015
Imaging oxygen in neural cell and tissue models by means of anionic cell-permeable phosphorescent nanoparticles
Cellular and Molecular Life Sciences
72,
367-381,
2015
High Performance Optical Trace Oxygen Sensors Based on NIR-Emitting Benzoporphyrins Covalently Coupled to Silicone Matrixes
Sensors and Actuators / B, Chemical
216,
527-234,
2015
Early non-destructive biofouling detection and spatial distribution: Application of oxygen sensing optodes
Water Research
83,
10-20,
2015
NIR optical carbon dioxide sensors based on highly photostable dihydroxy-aza-BODIPY dyes
Journal of Materials Chemistry / C
2015,
5474-5483,
2015
Integrated catheter system for continuous glucose measurement and simultaneous insulin infusion
Biosensors & Bioelectronics
64,
102-110,
2015
Quick and simple integration of optical oxygen sensors into glass-based microfluidic devices
RSC Advances
2015,
70808 -70816,
2015
LUMOS-A Sensitive and Reliable Optode System for Measuring Dissolved Oxygen in the Nanomolar Range
PLoS ONE
10,
e0128125-e0128125,
2015
Versatile Conjugated Polymer Nanoparticles for High-Resolution O2 Imaging in 2D and 3D Cell Models and Tissues
ACS Nano
9,
5275-5288,
2015
Efficient Broadband Triplet–Triplet Annihilation‐Assisted Photon Upconversion at Subsolar Irradiance in Fully Organic Systems
Advanced Functional Materials
25,
5617-5624,
2015
Intrinsic artifacts in optical oxygen sensors - How reliable are our measurements?
Chemistry - a European Journal
21,
3978-3986,
2015
Long-wavelength analyte-sensitive luminescent probes and optical (bio) sensors
Methods and applications in fluorescence
3,
1-37,
2015
2014
Enhancing Photoinduced Electron Transfer Efficiency of Fluorescent pH-Probes with Halogenated Phenols
Analytical Chemistry
86,
9293-9300,
2014
Ultra-sensitive optical oxygen sensors for characterization of nearly anoxic systems
Nature Communications
5,
4460-4464,
2014
Exceptional oxygen sensing properties of new blue light-excitable highly luminescent europium(III) and gadolinium(III) complexes
Advanced Functional Materials
24,
6548-6560,
2014
Low cost referenced luminescent imaging of oxygen and pH with a 2-CCD colour near infrared camera
Analyst
139,
4924-4933,
2014
pH-sensitive perylene bisimide probes for live cell fluorescence lifetime imaging
Journal of Materials Chemistry / B
2,
6792-6801,
2014
New highly fluorescent pH indicator for ratiometric RGB imaging of pCO2
Methods and applications in fluorescence
2,
1-8,
2014
Robust optical oxygen sensors based on polymer-bound NIR-emitting platinum(II)–benzoporphyrins
Journal of Materials Chemistry / C
2,
7589-7598,
2014
The effect of high light intensities on luminescence lifetime based oxygen sensing
Analyst
139,
6569-6579,
2014
2013
Diketo-Pyrrolo-Pyrrole Dyes as New Colorimetric and Fluorescent pH Indicators for Optical Carbon Dioxide Sensors
Analytical Chemistry
85,
3271-3279,
2013
Singlet oxygen-induced photodegradation of the polymers and dyes in optical sensing materials and the effect of stabilizers on these processes.
The Journal of Physical Chemistry / A
117,
8873-8882,
2013
A versatile approach for ratiometric time-resolved read-out of colorimetric chemosensors using broadband phosphors as secondary emitters
Analytica Chimica Acta
787,
219-225,
2013
New life of ancient pigments: application in high-performance optical sensing materials
Analytical Chemistry
85,
9371-9377,
2013
In vivo imaging of brain metabolism activity using a phosphorescent oxygen-sensitive probe
Journal of neuroscience methods
216,
141-151,
2013
Novel near infra-red fluorescent pH sensors based on 1-aminoperylene bisimides covalently grafted onto poly(acryloylmorpholine)
Chemical Communications
49,
2139-2141,
2013
Fluorescent materials for pH sensing and imaging based on novel 1,4-diketopyrrolo-[3,4-c]pyrrole dyes
Journal of Materials Chemistry / C
1,
5685-5693,
2013
Tuning the dynamic range and sensitivity of optical oxygen-sensors by employing differently substituted polystyrene-derivatives
Sensors and Actuators / B, Chemical
176,
344-350,
2013
Synthesis and Properties of New Phosphorescent Red Light-Excitable Platinum(II) and Palladium(II) Complexes with Schiff Bases for Oxygen Sensing and Triplet-Triplet Annihilation-Based Upconversion
Inorganic Chemistry
52,
1206-1216,
2013
2012
A simple method to reduce optical cross-talk effects in chemical imaging with planar optodes
Limnology and oceanography
10,
101--109,
2012
Highly photostable near-infrared fluorescent pH indicators and sensors based on BF 2-chelated tetraarylazadipyrromethene dyes
Analytical Chemistry
84,
6723-6730,
2012
New luminescent oxygen-sensing and temperature-sensing materials based on gadolinium(III) and europium(III) complexes embedded in an acridone-polystyrene conjugate
Analytical and Bioanalytical Chemistry
404,
2797-2806,
2012
Imaging of surface O-2 dynamics in corals with magnetic micro optode particles
Marine biology
159,
1621-1631,
2012
A novel planar optical sensor for simultaneous monitoring of oxygen, carbon dioxide, pH and temperature
Analytical and Bioanalytical Chemistry
400,
2463-2474,
2012
Stable optical oxygen sensing materials based on click-coupling of fluorinated platinum (II) and palladium (II) porphyrins-a convenient way to eliminate dye migration and leaching
Sensors and Actuators / B, Chemical
169,
173-181,
2012
Complexes of IrIII-Octaethylporphyrin with Peptides as Probes for Sensing Cellular O2
ChemBioChem
13,
1184-1190,
2012
A Phosphorescent Nanoparticle-Based Probe for Sensing and Imaging of (Intra)Cellular Oxygen in Multiple Detection Modalities of (Intra)Cellular Oxygen in Multiple Detection Modalities
Advanced Functional Materials
22,
4931-4939,
2012
New fluorescent pH sensors based on covalently linkable PET rhodamines
Talanta
99,
194-201,
2012
Triplet–Triplet Annihilation-Based Anti-Stokes Oxygen Sensing Materials with a Very Broad Dynamic Range
Advanced Functional Materials
22,
4360-4368,
2012
Microenvironmental Ecology of the Chlorophyll b-Containing Symbiotic Cyanobacterium Prochloron in the Didemnid Ascidian Lissoclinum patella.
Frontiers in Microbiology
3,
1-18,
2012
2011
Mini-emulsion solvent evaporation: A simple and versatile way to magnetic nanosensors
Microchimica Acta
172,
299-308,
2011
Ultrabright planar optodes for luminescence life-time based microscopic imaging of O2 dynamics in biofilms
Journal of microbiological methods
85,
67-74,
2011
Novel optical trace oxygen sensors based on platinum(II) and palladium(II) complexes with 5,10,15,20-meso-tetrakis-(2,3,4,5,6-pentafluorphenyl)-porphyrin covalently immobilized on silica-gel particles.
Analytica Chimica Acta
690,
108-115,
2011
Strongly Phosphorescent Iridium(III)–Porphyrins – New Oxygen Indicators with Tuneable Photophysical Properties and Functionalities
European Journal of Inorganic Chemistry
10,
1531-1534,
2011
Intracellular O2 sensing probe based on cell-penetrating phosphorescent nanoparticles
ACS Nano
5,
5499-5508,
2011
New fluorescent perylene bisimide indicators-a platform for broadband pH optodes
Analytical and Bioanalytical Chemistry
400,
2475-2485,
2011
A simple and inexpensive high resolution color ratiometric planar optode imaging approach: Application to oxygen and pH sensing
Limnology and oceanography
9,
348-360,
2011
Other publications
2019
Macroporous Polymeric Oxygen Scavenger Material
Macroporous poly(norbornadiene) is a fast oxygen scavenger material at room temperature
Temperature sensing and sensor design using a new thermographic phosphor for a wide range of applicationsProceedings 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference, CLEO/Europe-EQEC 2015
2018
New opportunities for optical temperature sensing with Mn<sup>4+</sup>-doped magnesium titanateBragg Gratings, Photosensitivity and Poling in Glass Waveguides and Materials, BGPPM 2018
CHAPTER 1Quenched-phosphorescence Detection of Molecular Oxygen1-18
Fast pH Optodes for Use in pH Eddy Covariance
A Covalently Coupled pH Sensor Material in a Crosslinked Matrix for Oceanography
Fluorescent Triangulenium Dyes for Lifetime-based Optical pH Sensing
Thermally Activated Delayed Fluorescence Emitters for Optical Temperature Sensing and Imaging
Optical ammonia sensor for continuous bioprocess monitoring
OPTICAL PH IMAGING OF CONCRETE EXPOSED TO CHEMICALLY CORROSIVE ENVIRONMENTSProceedings of final Conference of RILEM TC 253-MCI203-208
Macroporous Polymeric Oxygen Scavenger Material
Optical Ammonia Sensor for Continuous Bioprocess MonitoringProceedings Eurosensors 2018
2017
Fluorescent Ion Sensing Materials using BODIPY Dyes with Aza-Crown Ether Recognition Units
Fluorescent Ca2+ Indicator Dyes for Optical Sensing
Fluorescent BODIPY dyes with aza crown- or cryptand ether recognition units for K+ sensing
Fluorescent Ca2+ Indicator Dyes for Optical Sensing
Optical Ion Sensors – A modular system for fluorescence indicators and their applications as sensing materials
Purely organic dyes with thermally activated delayed fluorescence – a versatile class of indicators for optical temperature sensing
FIRST ROMP BASED TERPOLYMERS FOR THE USE AS A LIGHT UP-CONVERTING MATERIAL VIA TRIPLET-TRIPLET ANNIHILATION
Optical Temperature Sensing with Thermally Activated Delayed Fluorescence Emitters
2016
Fluorescence Optical Sensors for the Measurement of K+ Ions
Fluorescent K+ Sensor Materials
Oxygen-sensor-enhanced Microfluidic Devices: Flexible Tools for Organ-on-a-chip Applications
A Versatile Approach for Integration of Oxygen Sensors into Glass-based Microfluidic Devices
A Small Autonomous Optode for Oceanographic pH, CO2 and Oxygen Measurements
New pi-extended benzoporphyrins as readily available phosphorescent dyes for application in optical oxygen sensors and triplet-triplet-annihilation upconversion systems
New Phosphorescent Benzoporphyrin Complexes for Optical Sensing of Oxygen and Triplet-Triplet-Annihilation based Upconversion
Ultra-Bright Red Emitting Perylene Indicator Dyes for Optical pH Sensors
Fluorescent Potassium Sensors for Water using BODIPY Dyes with Aza–Crown-Ether Immobilised in Hydrogel Matrices
A stable and fast pH Optode for Seawater Measurements
New Robust, Long-term Stable Optical Carbon Dioxide Sensor Based on Dihydroxy-aza-BODIPY Dyes
A Small Autonomous Optode for Oceanographic pH, CO2 and Oxygen Measurements
New Classes of NIR phosphorescent Benzoporphyrin Dyes for Optical Oxygen Sensing and Application in Photonic Materials
2015
Neuartige optische pCO2-Sensoren basierend auf BF2-Chelatverbindungen von Dihydroxy-aza-Dipyrromethenen
A pH-Optode for Seawater Monitoring
Advanced Optical Oxygen Sensor Materials based on NIR-Emitting Benzoporphyrins Covalently Grafted to Polymers
Convenient and Time-saving Synthesis for Highly Soluble and Photostable Phosphorescent Benzoporphyrin dyes
Conjugated Polymer Nanoparticles as Versatile Materials for Optical Sensing and Imaging of Oxygen in Cells and Microfluidic Devices
Simple and Versatile Synthesis of new Highly-Soluble and Photostable Phosphorescent Pt(II)- and Pd(II)-Benzoporphyrin Dyes
New High Performance Optical pCO2 Sensors Based on BF2-Chelates of Dihydroxy-aza-Dipyrromethene
Reliable quantification of dissolved oxygen in "anoxic systems" with optodes
New optodes for sensing and imaging of pH in aquatic systems on microscale
2014
Novel BF2-Chelated Tetraarylazadipyrromethene Dyes for Optical Sensing of pH and Carbon Dioxide
New fluorescent pH sensing materials based on BF2-chelated azadipyrromethenes
High-Performance Optical Oxygen Sensors Based on New Phosphorescent Metalloporphyrins
Low cost referenced luminescent imaging with 2-CCD color-near infrared cameras
Ultra-sensitive Optical Oxygen Sensors based on Long-decaying Phosphorescent Complexes embedded in Perfluorinated Polymers
Inorganic phosphors as highly versatile stable emitters for application in high performance optical sensing materials
Phenolate groups as modules for the design of effective fluorescence pH-sensors
LUMOS - A miniaturized measuring system for monitoring very low oxygen respiration rates close to anoxic conditions
Optical Carbon Dioxide Sensors based on Novel Indicator Dyes with Outstanding Photophysical Properties
Optical mulitanalyte sensors for applications in biofilms
A Multiple Fibre Optic Device for Monitoring Carbon Dioxide in Marine Environments
Optical (Trace) Oxygen Sensors Based on NIR-Emitting Benzoporphyrins Covalently Linked to Polymers
Near infra-red fluorescent pH-sensors based on 1-aminoperylene bisimides
2013
Highly Luminescent Europium(III) and Gadolinium(III) complexes for Application in Oxygen Sensing Materials
New optical sensors for marine research (pO2, pH, pCO2)
Near infra-red fluorescent pH probes and sensors
"New Life of Ancient Pigments: Application in High Performance Optical Sensing Materials"
High performance materials for optical sensing and imaging on microscale
Highly Fluorescent Diketo-Pyrrolo-Pyrrole Dyes for Optical pH and CO2 Sensors
2012
Optical oxygen sensors based on visible light excitable europium(III) and gadolinium(III) complexes
Tuning the dynamic range and sensitivity of optical O2-sensors by employing differently substituted polystyrene-derivatives
Errors in phase fluorometric based oxygen sensing caused by non-linear effects
Oxygen Lifetime Imaging with a new class of phosphorescent indicators - A smartphone application
Click based covalent coupling of platinum(II)-meso-tetra(pentafluorophenyl)porphyrin (PtTFPP) to different sensor materials
Phosphorescent IrIII-porphyrin-peptide conjugates as a cell penetrating oxygen probes
Optical pH sensors based on new 1,4-diketo[3,4-c]pyrroles and on covalently linked rhodamines
Molecular probes for intracellular oxygen based on Pt- and Pdpentafluorophenylporphyrins produced by click chemistry
Complexes of Ir(III)-octarethylporphyrin with peptides as probes for sensing celluar oxygen
Anti-Stokes trace oxygen sensors employing triplet-triplet annihilation-based upconversion
Near-infrared fluorescent pH sensors based on aza-boron-dipyrromethenes dyes
Diketo-Pyrrolo-Pyrrole Dyes as New pH Indicators for Optical CO2 Sensors in Marine Research
New Optical Sensing Materials for Application in Marine Research
2011
NIR luminescent high performance indicators and sensors
Phosphorescent platinum(II) and palladium(II) complexes with donor-acceptor Schiff bases - new red light-excitable indicators for oxygen sensing
Functionalized phosphorescent IrIII- and PtII-porphyrins – for bioconjugation and polymer coupling
New long-wave excitable, covalently coupled sensors for pH based on photoinduced electron transfer
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