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Site‐Specific Self‐Assembled Liquid‐Gated ZnO Nanowire Transistors for Sensing Applications
Author(s) -
Pachauri Vivek,
Vlandas Alexis,
Kern Klaus,
Balasubramanian Kannan
Publication year - 2010
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.200900876
Subject(s) - materials science , nanowire , nanotechnology , transistor , nanostructure , electrode , photolithography , biosensor , field effect transistor , realization (probability) , scalability , optoelectronics , computer science , voltage , chemistry , electrical engineering , statistics , mathematics , database , engineering
A scalable bottom‐up solution‐based approach for the site‐specific realization of ZnO nanowire (ZnO‐NW)‐based field‐effect transistors for sensing applications in liquids is reported. The nanowires are grown across predefined electrodes patterned by photolithography. Site specificity is attained by the use of nanoparticles acting as seeds. Using integrated on‐chip microchannels and microfabricated gate electrodes, electrochemically gated ZnO‐NW network transistors functioning in liquids are demonstrated. The optimized devices are rendered sensitive to pH through chemical functionalization. The unique combination of the sensitivity, site specificity, scalability, and cost effectiveness of the technique opens up avenues for the routine realization of one‐dimensional nanostructure‐based chemical and biosensors for analytical and diagnostic applications.