Bushmaker Adam W, Oklejas Vanessa, Walker Don, Hopkins Alan R, Chen Jihan, Cronin Stephen B
Physical Sciences Laboratories, The Aerospace Corporation, 355 S. Douglas Street, El Segundo, California 90245, USA.
Department of Electrical Engineering, The University of Southern California, 3601 Watt Way, Los Angeles, California 90089, USA.
Nat Commun. 2016 Jan 25;7:10475. doi: 10.1038/ncomms10475.
Single-ion detection has, for many years, been the domain of large devices such as the Geiger counter, and studies on interactions of ionized gasses with materials have been limited to large systems. To date, there have been no reports on single gaseous ion interaction with microelectronic devices, and single neutral atom detection techniques have shown only small, barely detectable responses. Here we report the observation of single gaseous ion adsorption on individual carbon nanotubes (CNTs), which, because of the severely restricted one-dimensional current path, experience discrete, quantized resistance increases of over two orders of magnitude. Only positive ions cause changes, by the mechanism of ion potential-induced carrier depletion, which is supported by density functional and Landauer transport theory. Our observations reveal a new single-ion/CNT heterostructure with novel electronic properties, and demonstrate that as electronics are ultimately scaled towards the one-dimensional limit, atomic-scale effects become increasingly important.
多年来，单离子检测一直是盖革计数器等大型设备的领域，并且关于电离气体与材料相互作用的研究仅限于大型系统。迄今为止，尚无关于单个气态离子与微电子器件相互作用的报道，并且单中性原子检测技术仅显示出微小的、几乎无法检测到的响应。在此，我们报告了在单个碳纳米管（CNT）上观察到单个气态离子吸附的情况，由于一维电流路径受到严重限制，碳纳米管经历了超过两个数量级的离散、量子化电阻增加。只有正离子通过离子势诱导载流子耗尽的机制引起变化，这得到了密度泛函和朗道尔输运理论的支持。我们的观察揭示了一种具有新颖电子特性的新型单离子/碳纳米管异质结构，并表明随着电子器件最终向一维极限缩小，原子尺度效应变得越来越重要。
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