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Proceedings Paper

Adsorption of mercaptosilanes on nanocrystalline and single crystal zinc oxide surfaces
Author(s): Jagdeep Singh; JiSun Im; James E. Whitten; Jason W. Soares; Alexa M. Meehan; Diane M. Steeves
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Paper Abstract

The wide band gap and unique photoluminescence (PL) spectrum of nanocrystalline zinc oxide (nano-ZnO) make it attractive for a variety of photonics and sensor applications. Toward the goal of modifying the electronic structure and optical properties of nano-ZnO, the adsorption of 3-mercaptopropyltriethoxysilane (MPTES) has been investigated. Nano-ZnO rods having widths of 10-20 nm and lengths of 100-300 nm were functionalized by ultrasonicating them in a hot ethanol/water solution and adding MPTES. FTIR and X-ray photoelectron spectroscopy (XPS) of the modified nano- ZnO confirm silane functionalization. The presence of hydroxyl groups prior to functionalization suggests that adsorption to ZnO occurs primarily via a condensation reaction and the formation of Zn-O-Si bonds. Comparison has been made to 3-mercaptopropyltrimethoxysilane (MPTMS) adsorbed in ultrahigh vacuum onto sputter-cleaned single crystal ZnO(0001) in which MPTMS vapor is leaked into the vacuum chamber. In this case, bonding occurs via the thiol groups, as indicated by angle-resolved XPS studies. Similar experiments in which sputter-cleaned ZnO(0001) is dosed with dodecanethiol (DDT) confirm adsorption via S-Zn bond formation. Photoluminescence measurements of MPTES-functionalized nano-ZnO show an increase in intensity of the UV emission peak and a decrease in the visible peak relative to the unfunctionalized particles. The reduction of the visible emission peak is believed to be due to passivation of surface defects.

Paper Details

Date Published: 4 September 2008
PDF: 8 pages
Proc. SPIE 7030, Nanophotonic Materials V, 70300T (4 September 2008); doi: 10.1117/12.794805
Show Author Affiliations
Jagdeep Singh, Univ. of Massachusetts Lowell (United States)
JiSun Im, Univ. of Massachusetts Lowell (United States)
James E. Whitten, Univ. of Massachusetts Lowell (United States)
Jason W. Soares, U.S. Army Natick Soldier Research, Development and Engineering Ctr. (United States)
Alexa M. Meehan, U.S. Army Natick Soldier Research, Development and Engineering Ctr. (United States)
Diane M. Steeves, U.S. Army Natick Soldier Research, Development and Engineering Ctr. (United States)

Published in SPIE Proceedings Vol. 7030:
Nanophotonic Materials V
Zeno Gaburro; Stefano Cabrini; Dmitri Talapin, Editor(s)

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