Site-selective assembly and reorganization of gold nanoparticles along aminosilane-covered nanolines prepared on indium-tin oxide

Langmuir : the ACS Journal of Surfaces and Colloids
Jeonghyeon YangHiroyuki Sugimura

Abstract

We have fabricated gold nanoparticle (AuNP) arrays on indium-tin oxide (ITO) substrates in a nearly one-dimensional fashion. AuNPs were site-selectively immobilized on ITO of which the surface had been patterned by a nanolithography process based on scanning probe microscopy. The fabricated nanoscale lines covered with aminosilane self-assembled monolayer served as chemisorption sites for citrate-stabilized AuNPs of 20 nm in diameter, accordingly, AuNP nanolines with a thickness of single nanoparticle diameter were spontaneously assembled on the lines. In this 1D array, the AuNPs were almost separated from each other due to the electrostatic repulsion between their negatively charged surface layers. Furthermore, a reorganization process of the immobilized AuNP arrays has been successfully demonstrated by replacing each AuNP's surface layer from citric acid to dodecanethiol. By this process, the AuNPs lost their electrostatic repulsion and became hydrophobic so as to be attracted to each other through hydrophobic interaction, resulting in reorganization of the AuNP array. By repeating the deposition and reorganization cycle, AuNPs were more densely packed. The optical absorption peak of the arrays due to their plasmonic resonanc...Continue Reading

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Citations

Mar 26, 2014·Nanoscale·Manuel J MendesIsodiana Crupi
Apr 18, 2015·Nanoscale Research Letters·Ericka Rodríguez-LeónAmir Maldonado
Apr 6, 2016·ACS Applied Materials & Interfaces·Yudi TuHiroyuki Sugimura
Dec 11, 2014·Journal of Colloid and Interface Science·Francisco PalazonJean-Pierre Cloarec
Nov 15, 2017·Nanotechnology·Jinling SunJianhui Liao
Mar 9, 2017·Nanotechnology·Yu K Ryu, Ricardo Garcia
Aug 3, 2013·Langmuir : the ACS Journal of Surfaces and Colloids·Vinith YathindranathTorsten Hegmann
Feb 28, 2015·ACS Applied Materials & Interfaces·Lorenzo LeandroAndrei Lavrinenko
Apr 5, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Christopher R FetterlyJillian M Buriak

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