AgAuPt hybrid nanocages modified electrode showed high sensitivity for the detection of hydrogen peroxide.

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. Thus, the change of LSPR peak was proportional to the concentration of Sal in the solution. The experimental results demonstrated that the LSPR immunosensor possessed a good sensitivity and a high selectivity for Sal. The detection range for Sal was from 0.05 to 0.8 μg/mL with a correlation coefficient of 0.996. The biosensor was applied for the detection for Sal in spiked animal feed and pork liver samples, and the recoveries were in the range of 97-105 %. Therefore, it is expected that this approach may offer a new method in designing label-free LSPR immunosensor for detection of small molecules.

A simple electrochemical approach, which integrates nanoseed nucleation and a square‐wave cyclic voltammetry (SWCV) growth strategy, was developed to construct silver nanoparticles (AgNPs) on indium tin oxide (ITO)‐coated glass surfaces. Ag nanoseeds were first deposited on the ITO surface by using pulse chronoamperometry and the particles were then grown during the SWCV process. Factors that have great effects on the characterization of AgNPs during the electrochemical process were systematically investigated. It is demonstrated that the growth process can be controlled separately. AgNPs and clusters were deposited and grown onto the ITO substrate. Moreover, the nanoparticles grew monotonically with increasing number of cycles, which provides a powerful tool to control the nanoparticle size by simply changing the number of SWCV cycles.

SummaryMetal 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. It was found that chains of Au nanocages were formed on the substrate surface during dealloying. When the concentration of HNO3 increased to 20%, the structures of nanocages were damaged and formed crescent or semi-circular shapes. The transfer process on the substrate surface was discussed.

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