Selective oxidative etching of CTAC-stabilized multi-branched gold nanoparticles: application in spectral sensing of iodide ions

Gold Nanoparticle-Based Colorimetric Strategies for Chemical and Biological Sensing Applications

“…Presently, various AuNPs, such as gold nanospheres, gold nanorods (AuNRs) [88,89], gold nanotriangles, and gold nanourchins [88] have been used as etching-based colorimetric sensors. Generally, the etching process causes a change in the shape or size of the nanoparticles and therewith a shift in the LSPR extinction peak and a subsequent change in color.…”

A gold nanorod-based plasmonic platform for multi-logic operation and detection

“…To the best of our knowledge, this is the first report on building AuNR-based logic gates that exploit their morphological changes. By analogy, alternative building blocks, for example, gold-based multi-branched nanoparticles [42], nanobipyramids [43] and triangular nanoplates [44] for colorimetric readout, hypochlorite [45], chromium(VI)/bromide ion [46], enzymes [22] and thiosulfate system [47] as etchants, and mercapto compounds such as glutathione and captopril as anti-etching agents, can be employed to construct various plasmonic platforms based on this strategy to execute more logical operations.…”

Controlling the reduction rate and oxidative etching for high yield green synthesis of palladium nanorods in segmented millifluidic flow reactors (SMFRs)

“…Previous studies have discovered that Br − ions demonstrate a higher degree of oxidative etching than chloride ions. 43,44 Unlike the oxidative etching of the chloride ions that maximizes the presence of single twinned structures by dissolving the multiple twinned structures back into the aqueous solution, the more intense oxidative etching of Br − ions cause the Pd atoms generated from metal precursor reduction to be deposited on the existing seed structures, thereby, enlarging their size. 45 This phenomenon results in the enlarged decahedra observed in the TEM images that are shown in Fig.…”