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Selective and Rapid Room Temperature Detection of H 2 S Using Gold Nanoparticle Chain Arrays
Author(s) -
Lee Joun,
Mubeen Syed,
Hangarter Carlos M.,
Mulchandani Ashok,
Chen Wilfred,
Myung Nosang V.
Publication year - 2011
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.201100295
Subject(s) - nanoparticle , nanotechnology , materials science , colloidal gold , chain (unit) , physics , astronomy
A novel conductometric hydrogen sulfide (H 2 S) sensor was fabricated by AC dielectrophoretic assembly of amino acid mediated grown gold nanoparticles across microfabricated gold electrodes. Excellent sensing performance toward hydrogen sulfide, including a sensitivity of 29.84 % ppm −1 , a lower detection limit in the sub‐ppm level, the upper detection limit of 2 ppm, and a response time of<20 s for 10 ppm H 2 S was achieved at room temperature. In addition, excellent selectivity was demonstrated toward CO and SO 2 with minimum interference from NH 3 . Enhanced sensor performance may be attributed to the use of amino acid capped gold nanoparticles compared to thiolated gold nanoparticles and optimized assembly conditions to control the density of gold nanoparticle chains and electron transport properties.