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Robust gold nanoparticles stabilized by trithiol for application in chemiresistive sensors.

Authors
Garg-N; Mohanty-A; Lazarus-N; Schultz-L; Rozzi-TR; Santhanam-S; Weiss-L; Snyder-JL; Fedder-GK; Jin-R
Source
Nanotechnology 2010 Oct; 21(40):405501
NIOSHTIC No.
20037711
Abstract
The use of gold nanoparticles coated with an organic monolayer of thiol for application in chemiresistive sensors was initiated in the late 1990s; since then, such types of sensors have been widely pursued due to their high sensitivities and reversible responses to volatile organic compounds (VOCs). However, a major issue for chemical sensors based on thiol-capped gold nanoparticles is their poor long-term stability as a result of slow degradation of the monothiol-to-gold bonds. We have devised a strategy to overcome this limitation by synthesizing a more robust system using Au nanoparticles capped by trithiol ligands. Compared to its monothiol counterpart, the new system is significantly more stable and also shows improved sensitivity towards different types of polar or non-polar VOCs. Thus, the trithiol-Au nanosensor shows great promise for use in real world applications.
Keywords
Nanotechnology; Volatiles; Organic-compounds; Monitors; Monitoring-systems; Gases; Vapors
Contact
Jay L Snyder, National Institute for Occupational Safety and Health (NIOSH), Pittsburgh, PA 15236, USA
CODEN
NNOTER
Publication Date
20101008
Document Type
Journal Article
Email Address
zpx5@cdc.gov
Funding Type
Contract
Fiscal Year
2011
NTIS Accession No.
NTIS Price
Identifying No.
Contract-200-2002-00528
Issue of Publication
40
ISSN
0957-4484
NIOSH Division
NPPTL
Source Name
Nanotechnology
State
PA
Performing Organization
Carnegie Mellon Univiversity
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