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A Chemically-ResponsiveNanojunction within a SilverNanowire.
- Source :
-
Nano Letters . Mar2012, Vol. 12 Issue 3, p1729-1735. 7p. - Publication Year :
- 2012
-
Abstract
- The formation of a nanometer-scale chemically responsivejunction(CRJ) within a silver nanowire is described. A silver nanowire wasfirst prepared on glass using the lithographically patterned nanowireelectrodeposition method. A 1â5 nm gap was formed in this wireby electromigration. Finally, this gap was reconnected by applyinga voltage ramp to the nanowire resulting in the formation of a resistive,ohmic CRJ. Exposure of this CRJ-containing nanowire to ammonia (NH3) induced a rapid (<30 s) and reversible resistance changethat was as large as ÎR/R0= ()138% in 7% NH3and observable down to 500ppm NH3. Exposure to water vapor produced a weaker resistanceincrease of ÎR/R0,H2O= ()10â15% (for 2.3% water) while nitrogen dioxide (NO2) exposure induced a stronger concentration-normalized resistancedecrease of ÎR/R0,NO2= (â)10â15% (for 500 ppm NO2). The proposed mechanism of the resistance response for a CRJ, supportedby temperature-dependent measurements of the conductivity for CRJsand density functional theory calculations, is that semiconductingp-type AgxO is formed within the CRJ andthe binding of molecules to this AgxOmodulates its electrical resistance. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 15306984
- Volume :
- 12
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Nano Letters
- Publication Type :
- Academic Journal
- Accession number :
- 73768944
- Full Text :
- https://doi.org/10.1021/nl300427w