Document Detail

A flexible method for depositing dense nanocrystal thin films: impaction of germanium nanocrystals.
MedLine Citation:
PMID:  20660954     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Nanomaterials are exciting candidates for use in new optical and electronic devices ranging from solar cells to gas sensors. However, to reach their full potential, nanomaterials must be deposited as dense thin films on flexible substrates using inexpensive processing technologies such as roll-to-roll printing. We report a new, flexible technique for depositing aerosolized nanocrystals that lends itself to roll-to-roll processes. Germanium nanocrystals produced in a plasma are accelerated through a slit orifice by a supersonic gas jet and are impacted onto a translated substrate. A uniform nanocrystal film is quickly deposited over large areas, and features as small as 2 microm can then be patterned using conventional lift-off photolithography. The density of a deposited film depends on the pressures upstream and downstream of the orifice, their ratio, and the distance between the orifice and the substrate. Nanocrystal film densities exceeding 50% of the density of bulk germanium are routinely achieved with several sizes of nanocrystals, approaching the theoretical limit for randomly packed spheres. A simple model is presented that shows that the calculated nanocrystal velocity upon impaction is strongly correlated with the resulting film density.
Z C Holman; U R Kortshagen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-07-27
Journal Detail:
Title:  Nanotechnology     Volume:  21     ISSN:  1361-6528     ISO Abbreviation:  Nanotechnology     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-27     Completed Date:  2010-11-03     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101241272     Medline TA:  Nanotechnology     Country:  England    
Other Details:
Languages:  eng     Pagination:  335302     Citation Subset:  -    
Mechanical Engineering Department, University of Minnesota, 111 Church St. SE, Minneapolis, MN 55455, USA.
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