Synthesis of 16-Mercaptohexadecanoic acid capped gold nanoparticles and their immobilization on a substrate |
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Authors: | Raju Kumar GuptaMP Srinivasan R Dharmarajan |
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Affiliation: | a Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117576, Singaporeb Centre for Environmental Risk Assessment and Remediation (CERAR), University of South Australia, Mawson Lakes, South Australia 5095 |
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Abstract: | Controlled assembly of nanoparticles on substrates is a promising path to develop miniaturized electronic and optical devices. Among the important issues to be addressed in this area include immobilization of the nanoparticles on substrates in order to ensure that the system is robust. In this work, 16-mercaptohexadecanoic acid (16-MHDA) capped gold nanoparticles with a narrow size distribution have been synthesized through a single phase synthesis method and subsequently immobilized on to silicon surface through covalent molecular assembly. Fourier transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) confirmed the absence of unreacted thiol in the synthesized gold nanoparticles. Presence of gold nanoparticles on Si surface after the immobilization process was confirmed through XPS. Cross-sectional high resolution transmission electron microscopy (HR-TEM) images provide direct evidence that the particles are indeed anchored to the silicon surface. The formation of uniform-sized and separated acid functionalized gold nanoparticles and their immobilization on to Si provide a basis for further nano-structuring. |
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Keywords: | Covalent binding Gold nanoparticles Functionalization Stability Immobilization |
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