Nano Research

, Volume 3, Issue 8, pp 537–544 | Cite as

Micro- and nanostripes of self-assembled Au nanocrystal superlattices by direct micromolding

Open Access
Research Article

Abstract

A simple, inexpensive direct micromolding method for patterning Au nanocrystal superlattices using a polydimethylsiloxane (PDMS) stamp has been developed. The method involves in situ synthesis of Au(I) dodecanethiolate and its decomposition leading to Au nanocrystals in the microchannels of the stamp which order themselves to form patterned superlattice stripes, in conformity with the stamp geometry. Owing to its insolubility in common solvents, the dodecanethiolate was made by reacting Au(PPh3)Cl and dodecanethiol in situ inside the microchannels, by injecting first the former solution in toluene at room temperature followed by the thiol solution at 120 °C. Annealing the reaction mixture at 250 °C, resulted in formation of nanocrystals (with a mean diameter of 7.5 nm) and hexagonal ordering. By using an external pressure while molding, parallel stripes with sub-100 nm widths were obtained. The choice of parameters such as injection temperature of the thiol and concentrations is shown to be important if an ordered superlattice is to be obtained. In addition, these parameters can be varied as a means to control the nanocrystal size.

Keywords

nanolithography soft lithography metal nanocrystal superlattice micromolding direct patterning 

Supplementary material

12274_2010_14_MOESM1_ESM.pdf (996 kb)
Supplementary material, approximately 997 KB.

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Chemistry and Physics of Materials Unit and DST Unit on NanoscienceJawaharlal Nehru Centre for Advanced Scientific ResearchBangaloreIndia

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