Surfactantless Synthesis of Silver Nanoplates and Their Application in SERS
Authors:
Abstract
Silver nanoplates with thicknesses of 50–70 nm and edge lengths ranging from 200 nm to 1 μm have been grown on semiconductor wafers at room temperature through a simple galvanic reaction between an aqueous solution of AgNO3 and n‐type GaAs. The as‐grown Ag structures have chemically clean surfaces due to no surfactant or coordinating molecules being involved in the synthesis. Electron microscopy characterizations indicate that each Ag plate has rough surfaces and a half‐moon morphology with one straight edge and one arclike edge. Systematic studies on varying reaction conditions reveal that the oxide (i.e., Ga2O3 and As2O3) layers of GaAs, generated in situ in the reactions, play an important role in assisting the growth of anisotropic nanoplates. The cleanliness of the surfaces of the Ag nanoplates is beneficial to attachment of interesting molecules on their surfaces for various applications, such as plasmonic‐enhanced photophysical and photochemical processes and surface‐enhanced spectroscopies.Keywords
This publication has 128 references indexed in Scilit:
- Synthesis and Electrical Characterization of Silver NanobeamsNano Letters, 2006
- Printed Silver Ohmic Contacts for High-Mobility Organic Thin-Film TransistorsJournal of the American Chemical Society, 2006
- Metal-Enhanced Fluorescence-Based RNA SensingJournal of the American Chemical Society, 2006
- High‐Performance Organic Thin‐Film Transistors with Solution‐Printed Gold ContactsAdvanced Materials, 2005
- Crystal Overgrowth on Gold Nanorods: Tuning the Shape, Facet, Aspect Ratio, and Composition of the NanorodsChemistry – A European Journal, 2005
- Photolithographic Route to the Fabrication of Micro/Nanowires of III–V SemiconductorsAdvanced Functional Materials, 2005
- Formation of Self-Assembled Monolayers of Alkanethiols on GaAs Surface with in Situ Surface Activation by Ammonium HydroxideLangmuir, 1999
- Experimental investigation of charge transfer at the semiconductor/electrolyte junctionElectrochimica Acta, 1992
- Hole injection and etching studies of gallium arsenide using the scanning electrochemical microscopeLangmuir, 1990
- Surface‐enhanced Raman scattering of benzenethiol in silver solJournal of Raman Spectroscopy, 1987