Ultra-sensitive photoelectrochemical sensor for copper ion detection based on ITO/BiVO photoelectrode.

In this work, a photoelectrochemical sensor for Cu trace detection was prepared based on the excellent semiconductor material BiVO modified ITO electrode. It was found that Cu formed a doping effect by adsorption on the surface of ITO/BiVO electrode, which inhibited the photogenerated electron complex and thus caused an increase in photocurrent. In addition, due to the complexation effect of EDTA on Cu, the Cu adsorbed on the electrode surface is desorbed and the photocurrent returns to the blank value, making it possible to reuse electrodes.

Dual mode electrochemical-photoelectrochemical sensing platform for hydrogen sulfide detection based on the inhibition effect of titanium dioxide/bismuth tungstate/silver heterojunction.

A novel dual mode sensing platform is constructed for highly selective detection of HS, attributing to the efficient electrochemical (EC) and photoelectrochemical (PEC) signal responses of the TiO/BiWO/Ag heterojunction. On the one hand, TiO/BiWO/Ag heterojunction with excellent catalytic performance for the reduction of HO could be employed act as a probe, providing a remarkable EC response through an amperometric i-t method. On the other hand, this hybrid provides a photoelectric beacon with a favorable energy-band configuration.

Geometric and Electronic Engineering of Mn-Doped Cu(OH) Hexagonal Nanorings for Superior Oxygen Evolution Reaction Electrocatalysis.

The research on exploring advanced electrocatalysts that coupled with structural coherence and fast mass/electron transport characteristics, and maximized electrocatalytic redox activity is extremely urgent for the oxygen evolution reaction (OER), a key process for water dissociation, but it still challenging. Herein, we demonstrate a templated-engaged strategy for the fabrication of highly open and defect-rich Mn-doped Cu(OH) hexagonal nanorings (denoted as Mn-doped Cu(OH) HNs) by employing Mn(OH) hexagonal nanoplates as a sacrificial template. As a result of the successful doping of Mn into Cu(OH), the as-prepared Mn-doped Cu(OH) HNs possess rich defects and a modified electronic structure, which contribute to the exceptional property as a catalyst for OER electrocatalysis.

A photoelectrochemical glucose sensor based on gold nanoparticles as a mimic enzyme of glucose oxidase.

This work reports the first construction of the ternary layers of ITO/PbS/SiO/AuNPs nanostructure for development of photoelectrochemical (PEC) glucose sensor. Herein, the thioglycolic acid-capped PbS quantum dots was employed as a PEC active probe, which is very sensitive to oxygen. The small gold nanoparticles (AuNPs) were act as nanozyme (mimic enzyme of glucose oxidase) to catalytically oxidize glucose in the presence of oxygen, meanwhile consumed oxygen and then resulted in the decrease of cathodic photocurrent.

Fluorescence red-shift of gold-silver nanoclusters upon interaction with cysteine and its application.

In this work, gold-silver alloy nanoclusters (AuAg NCs) were demonstrated as a novel probe for fluorescent detection of cysteine (Cys). The alloy nanoclusters were fabricated by bovine serum albumin as a template and NaBH as a reducer. They showed a red emission at 650 nm.

A cathodic photoelectrochemical sensor for chromium(VI) based on the use of PbS quantum dot semiconductors on an ITO electrode.

Under visible-light irradiation, a cathodic photoelectrochemical (PEC) sensor is presented for highly sensitive determination of Cr(VI) at a potential of -0.25 V (vs SCE). PbS quantum dots (QDs) were capped with mercaptoacetic acid and assembled on the surface of an indium tin oxide (ITO) electrode via the linker poly(diallyl dimethyl ammonium chloride) providing a photoactive sensor.

Copper ion detection with improved sensitivity through catalytic quenching of gold nanocluster fluorescence.

In this report, a sensitive fluorescence detection of copper (Ⅱ) ion was developed. Although itself only a weak quencher toward gold nanocluster fluorescence, this ion functioned as a catalyst that accelerated the oxidation of iodide into iodine by a strong oxidant. The so-produced iodine quenched the nanocluster fluorescence through an efficient etching reaction, which rendered a much improved sensitivity for copper detection.

Gold nanocluster-based ratiometric fluorescent probes for hydrogen peroxide and enzymatic sensing of uric acid.

A method is described for ratiometric fluorometric assays of HO by using two probes that have distinct response profiles. Under the catalytic action of ferrous ion, the 615 nm emission of protein-stabilized gold nanoclusters (under 365 nm photoexcitation) is quenched by HO, while an increased signal is generated with a peak at 450 nm by oxidizing coumarin with the HO/Fe(II) system to form a blue emitting fluorophore. These decrease/increase responses give a ratiometric signal.

Ethylene Glycol Electrooxidation Based on Pentangle-Like PtCu Nanocatalysts.

The research of active and stable electrocatalysts toward liquid-fuel oxidation reaction is of great significance for the large-scale commercialization of fuel cells. Although extensive efforts have been devoted to pursuing high-performance nanocatalysts for fuel cells, both the high cost and sluggish reaction kinetics have been two major drawbacks that limited its commercial development. In this regard, we demonstrated a facile solvothermal method for the syntheses of an advanced class of PtCu nanocatalysts with a unique pentangle-like shape.

Graphene-like carbon nitride nanosheet as a novel sensing platform for electrochemical determination of tryptophan.

In this paper, a new and facile strategy has been demonstrated for the electrochemical determination of tryptophan (Trp), based on graphite-like carbon nitride (g-CN) nanosheets modified glassy carbon (CNNS/GC) electrode. The g-CN nanosheets were obtained via exfoliating bulk graphitic carbon nitride (bg-CN), which was synthesized using a thermal poly-condensation process. The obtained g-CN nanosheets were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM).

Colorimetric detection of glucose based on gold nanoparticles coupled with silver nanoparticles.

We have coupled gold nanoparticles (AuNPs) with silver nanoparticles (AgNPs) to assemble a plasmonic sensing platform for colorimetric detection of glucose. In this system, small AuNPs (~4nm) can act as glucose oxidase (GOD) mimic enzyme to catalytically oxidize glucose in the presence of oxygen, producing hydrogen peroxide, which dissolves AgNPs to lead the color changes. Glucose can be detected not only by naked eyes (from yellow to red) but also by spectrophotometer in the concentration range of 5-70μM, with detection limit of 3μM.

A sensitive plasmonic copper(II) sensor based on gold nanoparticles deposited on ITO glass substrate.

Gold nanoparticles (Au NPs) based plasmonic probe was developed for sensitive and selective detection of Cu(2+) ion. The Au NPs were self-assembled on transparent indium tin oxide (ITO) film coated glass substrate using poly dimethyl diallyl ammonium chloride (PDDA) as a linker and then calcined at 400°C to obtain pure Au NPs on ITO surface (ITO/Au NPs). The probe was fabricated by functionalizing l-cysteine (Cys) on to gold surface (ITO/Au NPs/Cys).

Formation of substrate-based gold nanocage chains through dealloying with nitric acid.

Metal nanocages have raised great interest because of their new properties and wide applications. Here, we report on the use of galvanic replacement reactions to synthesize substrate-supported Ag-Au nanocages from silver templates electrodeposited on transparent indium tin oxide (ITO) film coated glass. The residual Ag in the composition was dealloyed with 10% nitric acid.

Sensitive iodate sensor based on fluorescence quenching of gold nanocluster.

In this report we described a highly selective and sensitive iodate sensor. Due to its interaction with fluorescent gold nanoclusters, iodate was capable of oxidizing and etching gold core of the nanoclusters, resulting in fluorescence quenching. Furthermore, it was found that extra iodide ion could enhance this etching process, and even a small amount of iodate could lead to significant quenching.

Development of silver/gold nanocages onto indium tin oxide glass as a reagentless plasmonic mercury sensor.

We demonstrate the utilization of silver/gold nanocages (Ag/Au NCs) deposited onto transparent indium tin oxide (ITO) film glass as the basis of a reagentless, simple and inexpensive mercury probe. The localized surface plasmon resonance (LSPR) peak wavelength was located at ∼800 nm. By utilizing the redox reaction between Hg(2+) ions and Ag atoms that existed in Ag/Au NCs, the LSPR peak of Ag/Au NCs was blue-shifted.

Sensitive sulfide sensor with a trypsin-stabilized gold nanocluster.

In this work, we synthesized a trypsin-stabilized fluorescent gold nanocluster. It was found that sulfide interacted with the nanocluster, which could result in significant fluorescence quenching. With this quenching effect, a fluorescence sulfide sensor was developed.

A label-free immunosensor for determination of salbutamol based on localized surface plasmon resonance biosensing.

We developed a localized surface plasmon resonance (LSPR)-based label-free optical biosensor for detection of salbutamol (Sal). Hollow gold nanoparticles (HGNs) which deposited on transparent indium tin oxide (ITO) film coated glass was used to sensing platform. Antibody against Sal was immobilized on HGN surface to recognize the target Sal molecules.

Synthesis of hollow gold nanoparticles on the surface of indium tin oxide glass and their application for plasmonic biosensor.

Hollow gold nanoparticles (HGNs) deposited on the surface of transparent indium tin oxide (ITO) glass have been synthesized. The silver nanoparticles were firstly electrodeposited directly on the ITO surface as a template without any organic ligands or surfactants. Then these silver nanoparticles were taken as sacrificial templates and the HGNs were obtained by Galvanic replacement reaction between HAuCl4 solution and silver nanoparticles.

ZnS nanoparticles electrodeposited onto ITO electrode as a platform for fabrication of enzyme-based biosensors of glucose.

The electrochemical and photoelectrochemical biosensors based on glucose oxidase (GOD) and ZnS nanoparticles modified indium tin oxide (ITO) electrode were investigated. The ZnS nanoparticles were electrodeposited directly on the surface of ITO electrode. The enzyme was immobilized on ZnS/ITO electrode surface by sol-gel method to fabricate glucose biosensor.

Ultrathin gold-shell coated silver nanoparticles onto a glass platform for improvement of plasmonic sensors.

A facile and effective approach for the improvement of localized surface plasmon resonance (LSPR) biosensors based on silver-core and gold-shell nanoparticles (Ag@AuNPs) on a glass substrate was investigated. Silver nanoparticles (core) with thin gold shells on a transparent indium tin oxide (ITO) coated glass surface were prepared by sequential electrodeposition, and the influence of the thickness of the gold shell was systematically investigated. The experimental results indicate that the properties of an LSPR band of ultrathin (∼1.

Comparison of the direct electrochemistry of glucose oxidase immobilized on the surface of Au, CdS and ZnS nanostructures.

A comparison of the electrochemical and photoelectrochemical behaviors of three biosensors, based on the use of Au, CdS, and ZnS nanoparticles-glucose oxidase (GOD) system, is discussed. All the nanoparticles were electrodeposited onto the indium tin oxide (ITO) thin film coated glass surface. GOD was then immobilized on the nanoparticles-modified electrodes surface with the sol-gel technique.

Electrochemical deposition of high density gold nanoparticles on indium/tin oxide electrode for fabrication of biosensors.

High density gold nanoparticles (GNPs) on indium tin oxide (ITO) film coated glass have been prepared by one-step electrochemical deposition from KAu(CN)2 in phosphate buffer (pH 8.0) solution. The resulting electrode surface was characterized by scanning electron microscopy (SEM), UV-vis spectroscopy, X-ray diffraction (XRD) and electrochemical method.

Label-free optical biosensor based on localized surface plasmon resonance of twin-linked gold nanoparticles electrodeposited on ITO glass.

A simple low-cost electrochemical approach has been used to directly deposit twin-linked gold nanoparticles (TGNPs) onto transparent indium tin oxide (ITO) coated film glass. The as-prepared TGNPs have a transverse localized surface plasmon resonance (LSPR) band at 540 nm and a longitudinal LSPR band at about 710 nm. The longitudinal LSPR band of TGNPs exhibits higher refractive index sensitivity (245 nm/RIU) than its transverse LSPR band.

Electrodeposition of gold nanoparticles on indium/tin oxide electrode for fabrication of a disposable hydrogen peroxide biosensor.

A novel disposable third-generation hydrogen peroxide (H(2)O(2)) biosensor based on horseradish peroxidase (HRP) immobilized on the gold nanoparticles (AuNPs) electrodeposited indium tin oxide (ITO) electrode is investigated. The AuNPs deposited on ITO electrode were characterized by UV-vis, SEM, and electrochemical methods. The AuNPs attached on the ITO electrode surface with quasi-spherical shape and the average size of diameters was about 25 nm with a quite symmetric distribution.

Direct electrodeposition of gold nanoparticles on indium tin oxide surface and its application.

Gold nanoparticles (GNPs) were direct deposited onto the surface of indium tin oxide (ITO) electrode surface through cyclic voltammetric method. The GNPs-modified ITO electrodes were characterized by means of scanning electron microscopy (SEM), UV-vis spectroscopy and electrochemical methods. The quasi-spherical GNPs directly attached on the electrode surface with a relatively small size and a quite narrow distribution.