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Molecular detection based on the electrical conductance of gold nanoparticle arrays
- Source :
- Sensors and Actuators B: Chemical. 156:990-993
- Publication Year :
- 2011
- Publisher :
- Elsevier BV, 2011.
-
Abstract
- We report a molecular sensing method based on changes in the electrical conductance of lithographically defined gold nanoparticle (NP) arrays immersed in an analyte solution. As the closely spaced NPs are enlarged due to the analyte-mediated deposition of gold ions onto their surfaces, the conductance increases steeply near the critical time (tc) at which conducting pathways begin to form in the NP arrays. tc decreases with increasing analyte concentration in the solution. The temperature dependence of the conductance of the modified NP arrays confirms the good electrical contacts established between the newly formed nanoclusters on the NP surfaces. Our results demonstrate that the electrical conductance through metal NP arrays can be employed as a sensitive and reliable analytical signal for NP-based sensors, which do not require any post-processing for the formation of electrical contacts between the NPs.
- Subjects :
- Analyte
Materials science
Metals and Alloys
Conductance
Nanoparticle
Nanotechnology
Condensed Matter Physics
Electrical contacts
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Ion
Nanoclusters
Metal
Electrical resistance and conductance
visual_art
Materials Chemistry
visual_art.visual_art_medium
Electrical and Electronic Engineering
Instrumentation
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 156
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........030117b31794016129f2bcbc22c55c82