Modulating the photoelectrochemical response of titanium dioxide (TiO2) photoelectrodes using gold (Au) nanoparticles excited at different wavelengths

Saha, Sudip; Victorious, Amanda; Soleymani, Leyla

doi:10.1016/j.electacta.2021.138154

Cited by 16 publications

(14 citation statements)

References 73 publications

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“…Glucose is oxidized via the GOx enzymatic reaction to produce gluconic acid and hydrogen peroxide (H 2 O 2 ), which has a rate constant for oxidation 10–100 times higher than that of water, and then, H 2 O 2 is oxidized with consumption of photogenerated holes. The photogenerated holes generated in TiO 2 and the hot holes generated in Au NPs are eliminated along with the glucose oxidation reaction, leading to a higher photocurrent with an increasing glucose concentration. − …”

Section: Resultsmentioning

confidence: 99%

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Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO₂-Coated Al Films

Qin

et al. 2022

ACS Appl. Nano Mater.

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Photoelectrochemical (PEC) biosensors show great potential in biochemical molecular detection due to the advantages of low background noise, high sensitivity, and easy integration. However, the current PEC glucose biosensors are subject to the deficiencies of the relatively large limit of detection, small detectable range of concentration, and requirement of an operation voltage. Herein, we construct an unbiased glucose biosensor both in three- and two-electrode configurations using a glucose oxidase (GOx)-modified Schottky junction comprised of Au nanoparticle (NP)-decorated TiO2-coated Al films. A wide detectable range of concentration (0.3–104 μM) is achieved at relatively zero bias versus the reference electrode in a three-electrode configuration under AM 1.5G illumination along with a fitted sensitivity of 3780 μA mM–1 cm–2 (in the concentration range of 0.3–1.0 μM) and a limit of detection down to 0.05 μM. The photocurrents corresponding to typical interfering substances (e.g., uric acid and ascorbic acid) are less than 10% of that to glucose. Moreover, the constructed sensor achieves almost no attenuation in photocurrent under light ON/OFF circular irradiation for 30 min and shows a photocurrent around 92% of the initial value after 30-day storage in air at room temperature. The satisfactory sensing performance is ascribed to the following three aspects: (1) the optical absorption is enhanced due to the formation of a plane-parallel resonance cavity and the reduced band gap of the TiO2 material, (2) the separation and extraction of the photogenerated carriers are facilitated due to the Al doping and the embedded Schottky junction, and (3) the carrier transfer from the photoelectrode surfaces into the electrolyte is boosted because of the Au NPs and nanostructured GOx decoration. This work provides an alternative route to prepare high-performance and self-powered glucose sensors for diabetes diagnosis.

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Section: Resultsmentioning

confidence: 99%

“…The photogenerated holes generated in TiO 2 and the hot holes generated in Au NPs are eliminated along with the glucose oxidation reaction, leading to a higher photocurrent with an increasing glucose concentration. 38…”

Section: Resultsmentioning

confidence: 99%

Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO₂-Coated Al Films

Qin

et al. 2022

ACS Appl. Nano Mater.

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“…The hot electrons cross the Schottky barrier to reach the conduction band of TiO2 film and are finally collected by the counter electrode together with the photogenerated electrons. The hot holes participate in the glucose oxidation reaction and effectively utilize the visible part of sunlight other than the ultraviolet light [19] .…”

Section: Working Principlementioning

confidence: 99%

“…Constructing Au NHAs is an essential factor for the generation of SPR. The coupling of Au and TiO2 films can form Schottky barrier, which can improve the photocurrent response of the PEC sensor [18] . Experimental results show that for the optical sensing, the sensor has a sensitivity of 857 nm/RIU to glucose.…”

Section: Introductionmentioning

confidence: 99%

Optical and photoelectrochemical sensing of glucose based on Au nanohole arrays coupled with TiO2/Al films

Yu¹,

Lu²,

Ma³

et al. 2022

5th Optics Young Scientist Summit (OYSS 2022)

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The mainstream technology used in commercial glucose sensors is enzymatic electrochemical sensing. Although the use of enzymatic electrodes can specifically detect glucose, this sensor has many deficiencies such as large environmental impacts, complex enzyme-modification processes and relatively high cost. Constructing well-designed metal nanostructures can excite environment-dependent surface plasmon resonance (SPR) and generate hot electrons. By monitoring the central wavelength shift of SPR and collecting the photocurrent generated from the hot electrons, labelfree, enzyme-free, optical and photoelectrochemical (PEC) dual-mode sensing of glucose can be realized. Here, we combine magnetron sputtering, thermal treatment, nanosphere lithography, electron beam evaporation and lift-off processes to fabricate hexagonally-arranged gold nanohole arrays (Au NHAs) with adjustable diameters on aluminum (Al)/titanium dioxide (TiO2) film substrates, and constructed an enzyme-free glucose sensor based on the Al/TiO2/Au NHAs structure. The sensor is demonstrated to work in both optical sensing and PEC sensing modes. For optical sensing mode, the shift of the SPR peak corresponding to the glucose concentration range of 0-10 mM is observed, with an optical sensing sensitivity of 857 nm/RIU. For PEC sensing mode, the sensor at zero bias shows a linear range of 1 M-10 mM for glucose detection under simulated one-sun illumination, along with the detection of limit down to 1 M and the photocurrent sensing sensitivity of 0.53×logC A μM -1 cm -2 (where C is the molar concentration of glucose). Furthermore, the as-prepared glucose sensor also shows good stability and specific selection for glucose detection.

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“…According to an alternative hypothesis, the plasmonic Au nanoparticles can also be acting as an electron sink capturing the excited electrons from TiO2 and reducing the electron-hole recombination [15,40]. Thus, plasmonic Au nanoparticles can impart visible light activity to TiO2 for numerous applications, including photoelectrochemical sensing [41]. Photoelectrochemical TiO2-based sensors have been widely explored for the quantification of organic compounds [11,[42][43][44].…”

Section: Introductionmentioning

confidence: 99%

Surface plasmon resonance-induced visible light photocatalytic TiO2 modified with AuNPs for the quantification of hydroquinone

Mendonça

Khan

Rahemi

et al. 2021

Electrochimica Acta

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Modulating the photoelectrochemical response of titanium dioxide (TiO2) photoelectrodes using gold (Au) nanoparticles excited at different wavelengths

Cited by 16 publications

References 73 publications

Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO₂-Coated Al Films

Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO₂-Coated Al Films

Optical and photoelectrochemical sensing of glucose based on Au nanohole arrays coupled with TiO2/Al films

Surface plasmon resonance-induced visible light photocatalytic TiO2 modified with AuNPs for the quantification of hydroquinone

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Modulating the photoelectrochemical response of titanium dioxide (TiO2) photoelectrodes using gold (Au) nanoparticles excited at different wavelengths

Cited by 16 publications

References 73 publications

Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO2-Coated Al Films

Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO2-Coated Al Films

Optical and photoelectrochemical sensing of glucose based on Au nanohole arrays coupled with TiO2/Al films

Surface plasmon resonance-induced visible light photocatalytic TiO2 modified with AuNPs for the quantification of hydroquinone

Contact Info

Product

Resources

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Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO₂-Coated Al Films

Unbiased Glucose Biosensing Based on a Schottky Junction Comprised of Au Nanoparticle-Decorated TiO₂-Coated Al Films