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Microlandscaping of Au Nanoparticles on Few‐Layer MoS 2 Films for Chemical Sensing
Author(s) -
Lu Junpeng,
Lu Jia Hui,
Liu Hongwei,
Liu Bo,
Gong Lili,
Tok Eng Soon,
Loh Kian Ping,
Sow Chorng Haur
Publication year - 2015
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201402591
Subject(s) - materials science , nanoparticle , surface modification , raman spectroscopy , layer (electronics) , nanotechnology , laser , molecule , thin film , chemical engineering , organic chemistry , optics , chemistry , physics , engineering
Surface modification or decoration of ultrathin MoS 2 films with chemical moieties is appealing since nanointerfacing can functionalize MoS 2 films with bonus potentials. In this work, a facile and effective method for microlandscaping of Au nanoparticles (NPs) on few‐layer MoS 2 films is developed. This approach first employs a focused laser beam to premodify the MoS 2 films to achieve active surface domains with unbound sulfur. When the activated surface is subsequently immersed in AuCl 3 solution, Au NPs are found to preferentially decorate onto the modified regions. As a result, Au NPs can be selectively and locally anchored onto designated regions on the MoS 2 surface. With a scanning laser beam, microlandscapes comprising of Au NPs decorated on laser‐defined micropatterns are constructed. By varying the laser power, reaction time and thickness of the MoS 2 films, the size and density of the NPs can be controlled. The resulting hybrid materials are demonstrated as efficient Raman active surfaces for the detection of aromatic molecules with high sensitivity.