Electrochemical Synthesis of Well-Dispersed CdTe Nanoparticles on Reduced Graphene Oxide and Its Photoelectrochemical Sensing of Catechol

Abstract

A novel and simple, visible light-activated photoelectrochemical (PEC) sensor, based on n-type cadmium telluride (CdTe) nanoparticles and reduced graphene oxide (rGO), is proposed for catechol detection for the first time. rGO films were directly deposited onto an indium tin oxide (ITO) electrode via the cyclic voltammetric reduction of graphene oxide. CdTe nanoparticles were synthesized on the rGO/ITO surface via cathodic electrodeposition. To investigate the PEC performance of the as-prepared CdTe/rGO/ITO photoelectrode, the photoelectrode was used to detect trace catechol under visible light irradiation. The sensor exhibited a wide linear range, low detection limit, and high sensitivity given the photoactivity of CdTe and the high conductivity and large surface area of the rGO. The proposed CdTe/rGO/ITO electrode successfully detected trace amounts of catechol in several real water samples. Findings suggest that CdTe/rGO/ITO electrode is a promising candidate for PEC analysis.

Photoactivity and optical applications of organic materials containing selenium and tellurium

“…44,49 Without the presence of the dye, the sulfur and selenium-containing triplet sensitizers are quenched by oxygen, which occurs much faster than micro-second scale FRET to the uorescent dye. Once the sensitizer is bound to the pocket of the protein kinase, PIM, excited triplets are sterically protected from diffusional quenching by oxygen, allowing the triplet states to persist and undergo FRET to the uorescent dye (10) (Fig. 1b).…”

“…[1][2][3][4][5] In the inorganic materials space, much work has focused on semiconductor lms or nanocrystals such as CdSe or PbSe quantum dots or CdTe. [6][7][8][9][10][11][12] In between lie classes of organochalcogens, where selenium and tellurium have been judiciously placed into otherwise organic materials. Such materials have been used as photovoltaics, 13 transistors, 14 thermoelectric generators, 15 light emitting devices, 16 and sensors.…”

Hydrothermally Grown SnO2 Flowers as Efficient Electrode Modifier for Simultaneous Detection of Catechol and Hydroquinone

“…Electrochemical technique have drown much attention over other analytical methods due to its simplicity, cost effective sample preparation, highly sensitiveness, selectivity and fast determination. [11][12][13][14][15][16][17][18][19][20][21][22] The electrochemical determination of the pollutants affected by the presence different electrode modifiers. So, many research groups working in the field of electrochemistry have made some approaches by preparing different electrode modifier such as nanomaterials, polymers and graphene based hybrid composites.…”

“On–Off–On” Photoelectrochemical/Visual Lab-on-Paper Sensing via Signal Amplification of CdS Quantum Dots@Leaf-Shape ZnO and Quenching of Au-Modified Prism-Anchored Octahedral CeO2 Nanoparticles

“…To achieve remarkable photocurrent density, the strategy of ZnO nanostructure sensitized with other small bandgap semiconductor materials such as CdS quantum dots (QDs) is normally used, which can broaden the light absorption range and improve efficiency of photogenerated charge separation. , Apart from the desirable first amplified PEC signal, an efficient quencher also plays a critical role in reducing background signals and extending the linear range in on–off–on PEC system. So far, several strategies have been applied for quenching the photocurrent when biorecognition events occur, such as steric-hindrance effects, enzymatic reactions, sensitization effects, and energy transfer. − For example, the protocol based on energy transfer between semiconductor QDs and gold nanoparticles (Au NPs) has been widely utilized in the amplification for signal-off PEC assays. , However, because the limitation amount of quenchers immobilized on biosensors greatly hinders the quenching efficiency, exploring highly sensitive signal-amplification methods should be developed. In recent years, cerium dioxide (CeO 2 ) nanomaterial has exhibited potential applications in the fields of photocatalysis, optical limiters, and biosensors based on its favorable electrical, optical, and super intrinsic oxidase-like properties. − Specifically, when Au NPs are in intimate contact with CeO 2 , CeO 2 -supported Au NPs (Au@CeO 2 ) can effectively harvest photon energy across the visible light spectrum and catalyze electron donor reagent due to surface plasmon resonance (SPR) of Au NPs and their catalytically active surfaces, resulting in change of electron-transfer processes.…”

“…20−22 For example, the protocol based on energy transfer between semiconductor QDs and gold nanoparticles (Au NPs) has been widely utilized in the amplification for signal-off PEC assays. 23,24 However, because the limitation amount of quenchers immobilized on biosensors greatly hinders the quenching efficiency, exploring highly sensitive signal-amplification methods should be developed. In recent years, cerium dioxide (CeO 2 ) nanomaterial has exhibited potential applications in the fields of photocatalysis, optical limiters, and biosensors based on its favorable electrical, optical, and super intrinsic oxidase-like properties.…”