Department of Materials Science and Engineering, Yonsei University, Seoul, Korea.
Nanotechnology. 2010 Dec 10;21(49):495501. doi: 10.1088/0957-4484/21/49/495501. Epub 2010 Nov 16.
Single-walled carbon nanotube (SWNT) networks were used to detect hazardous dimethyl-methyl-phosphonate (DMMP) gas in real time, employing two different metals as electrodes. Random networks of SWNTs were simply obtained by drop-casting a SWNT-containing solution onto a surface-oxidized Si substrate. Although the electrical responses to DMMP at room temperature were reversible for both metals, the Pd-contacting SWNT network sensors exhibited a higher response and a shorter response time than those of the Au-contacting SWNT network sensors at the same DMMP concentration, due to the stronger interactions between the SWNTs and Pd surface atoms. In Pd-contacting SWNT network sensors, the response increased linearly with increasing DMMP concentration and reproducible response curves were obtained for DMMP levels as low as 1 ppm. These results indicate that SWNT networks in contact with Pd electrodes can function as good DMMP sensors at room temperature with scalable and fast response and excellent recovery.
单壁碳纳米管 (SWNT) 网络被用于实时检测危险的二甲基甲基膦酸酯 (DMMP) 气体，使用两种不同的金属作为电极。通过将含有 SWNTs 的溶液滴到表面氧化的 Si 衬底上，简单地获得了 SWNTs 的随机网络。尽管对于两种金属，室温下对 DMMP 的电响应都是可逆的，但与 Au 接触的 SWNT 网络传感器的响应和响应时间都比 Pd 接触的 SWNT 网络传感器更快，这是由于 SWNTs 和 Pd 表面原子之间更强的相互作用。在 Pd 接触的 SWNT 网络传感器中，响应随 DMMP 浓度的增加呈线性增加，对于低至 1ppm 的 DMMP 水平，可获得重现的响应曲线。这些结果表明，与 Pd 电极接触的 SWNT 网络可以作为室温下的良好 DMMP 传感器，具有可扩展的快速响应和优异的恢复能力。
