Hernandez-Ramirez F, Barth S, Tarancon A, Casals O, Pellicer E, Rodriguez J, Romano-Rodriguez A, Morante J R, Mathur S
IN2UB and EME/CErMAE/CEMIC Departament d'Electrònica, Universitat de Barcelona UB, C/MartíI Franqués 1, E-08028 Barcelona, Spain.
Nanotechnology. 2007 Oct 24;18(42):424016. doi: 10.1088/0957-4484/18/42/424016. Epub 2007 Sep 19.
Individual tin oxide nanowires (NWs), contacted to platinum electrodes using focused ion beam assisted nanolithography, were used for detecting water vapor (1500-32 000 ppm) in different gaseous environments. Responses obtained in synthetic air (SA) and nitrogen atmospheres suggested differences in the sensing mechanism, which were related to changes in surface density of the adsorbed oxygen species in the two cases. A model describing the different behaviors has been proposed together with comparative evaluation of NW responses against sensors based on bulk tin oxide. The results obtained on ten individual devices (tested >6 times) revealed the interfering effect of water in the detection of carbon monoxide and illustrated the intrinsic potential of nanowire-based devices as humidity sensors. Investigations were made on sensitivity, recovery time and device stability as well as surface-humidity interactions. This is the first step towards fundamental understanding of single-crystalline one-dimensional (1D) tin oxide nanostructures for sensor applications, which could lead to integration in real devices.
利用聚焦离子束辅助纳米光刻技术将单个氧化锡纳米线（NWs）与铂电极相连，用于检测不同气体环境中的水蒸气（1500 - 32000 ppm）。在合成空气（SA）和氮气气氛中获得的响应表明传感机制存在差异，这与两种情况下吸附氧物种的表面密度变化有关。提出了一个描述不同行为的模型，并对NW响应与基于块状氧化锡的传感器进行了比较评估。在十个单独的器件上（测试>6次）获得的结果揭示了水在一氧化碳检测中的干扰作用，并说明了基于纳米线的器件作为湿度传感器的内在潜力。对灵敏度、恢复时间、器件稳定性以及表面湿度相互作用进行了研究。这是朝着从根本上理解用于传感器应用的单晶一维（1D）氧化锡纳米结构迈出的第一步，这可能会促成其在实际器件中的集成。
