Zhang Y, Kolmakov A, Lilach Y, Moskovits M
Department of Chemistry and Biochemistry, University of California-Santa Barbara, Santa Barbara, California 93103-9510, USA.
J Phys Chem B. 2005 Feb 10;109(5):1923-9. doi: 10.1021/jp045509l.
Tin oxide single nanowires configured as field effect transistors were shown to be operable and tunable alternately as gas sensors or as catalysts under a gaseous atmosphere that simulated realistic ambient conditions. The unusually large surface-to-volume ratio available with nanowires causes adsorption or desorption of donor or acceptor molecules on the nanowire's surface to greatly alter its bulk electron density at relatively small values of the gate voltage. This process can be sensitively monitored as changes in the nanowire's conductivity. The potentially radical change in carrier density can lead to significant changes in the nanowire's sensitivity as a sensor or reciprocally as a catalyst in reactions that involve charge exchange across the nanowire's surface. This leads to the prospect of tuning catalysis or other surface reactions entirely through electronic means.
配置为场效应晶体管的氧化锡单纳米线在模拟真实环境条件的气态气氛下，被证明可交替作为气体传感器或催化剂运行和调节。纳米线具有异常大的表面积与体积比，这使得供体或受体分子在纳米线表面的吸附或解吸在相对较小的栅极电压值下就能极大地改变其体电子密度。这个过程可以通过纳米线电导率的变化被灵敏地监测到。载流子密度的潜在剧烈变化会导致纳米线作为传感器的灵敏度发生显著变化，或者在涉及纳米线表面电荷交换的反应中作为催化剂时，其催化活性发生相反的显著变化。这带来了完全通过电子手段调节催化或其他表面反应的前景。
