Molecular detection based on conductance quantization of nanowires
2000; American Institute of Physics; Volume: 76; Issue: 10 Linguagem: Inglês
10.1063/1.126025
ISSN1520-8842
AutoresC. Z. Li, Huixin He, Albert Bogozi, J. Scott Bunch, Nongjian Tao,
Tópico(s)Force Microscopy Techniques and Applications
ResumoWe have studied molecular adsorption onto stable metallic nanowires fabricated with an electrochemical method. Upon the adsorption, the quantized conductance decreases, typically, to a fractional value, which may be attributed to the scattering of the conduction electrons by the adsorbates. The further conductance change occurs when the nanowire is exposed to another molecule that has stronger adsorption strength. Because the quantized conductance is determined by a few atoms at the narrowest portion of each nanowire, adsorption of a molecule onto the portion is enough to change the conductance, which may be used for chemical sensors.
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