Electrodeposited Ag, Au, and AuAg nanoparticles on graphene oxide-modified screen-printed carbon electrodes for the voltammetric determination of free sulfide in alkaline solutions

Screen-Printed Electrodes Modified with Metal Nanoparticles for Small Molecule Sensing

“…Examples of a well-controlled electrodeposition process are bimetallic alloys. These systems are based on particles that combine two different metals in one single particle as a core shell [54] approach or simply by co-deposition [59]. The main goal of nanoparticulated alloys is the combination of the advantages from the different metals involved and the minimization of the disadvantages of each one [60].…”

“…Cyclic voltammetry is also employed for electrodeposition, but control is more difficult because more parameters need to be optimized, such as the scan rate, scan cycles, and potential window. Published works that use this technique with noble metals are mainly focused on the novelty of the substrates employed like graphite nanosheets [49], carbon nanotubes [55], fullerenes [48], graphene [46], and graphene oxide [59] than electrodeposition itself.…”

“…Bimetallic alloys were also obtained when using cyclic voltammetry as the electrochemical technique. Gold and silver have been deposited together onto the carbonous working electrode, improving the sensitivity by slightly giving up the dynamic range [59]. Silver as a substrate was also employed in another bimetallic system, where bismuth was electrodeposited onto silver SPE, creating an alloy capable of catalyzing hydrogen peroxide oxidation, but the mechanism involved remain unknown [39].…”

Preparation of Indium Tin Oxide Nanoparticle‐modified 3‐Aminopropyltrimethoxysilane‐functionalized Indium Tin Oxide Electrode for Electrochemical Sulfide Detection

“…Sulfide anion is one of the most harmful species to the environment and general public health as a consequence of toxicity of H 2 S . In aqueous solutions, sulfide exists mainly as S 2− and HS − species as well as H 2 S (depending on the ambient pH) .…”

“…Wei et al. prepared the ITONP‐modified ITO electrode by spin coating a mixture of ITONPs and Tween‐20 and successive annealing at 450 ° C. Ideally, this high temperature annealing should be eliminated for process simplification and reduction of the sensor cost .Generally, the preparation of the nanomaterials modified electrodes for sulfide sensor are complex and least cost effective as it required to use potential, and too long preparation steps including preprocessing of nanomaterials in harsh condition , . Although, some nanomaterial‐modified electrodes have been reported for the detection of sulfides due to their good electrocatalytic properties , the fabrication of sulfide sensors using the ITONP‐modified ITO, which is prepared at low temperature (40 °C) without preprocessing of commercially available ITONP, has not been reported.…”