Department of Integrated Design Engineering, Faculty of Science and Technology, Keio University , 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan.
Anal Chem. 2016 Nov 1;88(21):10744-10750. doi: 10.1021/acs.analchem.6b03387. Epub 2016 Oct 20.
A polyelectrolyte film containing metastable silver ions was applied as a quartz crystal microbalance (QCM) gas detector. The polyelectrolyte film was obtained by immersing a polyelectrolyte with numerous amine groups in a metal ion solution. The QCM detector with silver ions responded to a very low methylmercaptan gas concentration (20 ppb) but did not respond to ammonia, volatile amines, aromatic compounds, or alcohols. The response speed of the QCM detector increased gradually with increasing methylmercaptan concentrations. The highly sensitive and selective response is promoted by a ligand substitution reaction caused by the formation of coordinative bonds between a metastable silver ion and amine groups in the polyelectrolyte film. To the best of our knowledge, this system has the highest sensitivity among reported QCM gas detectors. Such high-sensitivity among reported QCM gas detectors. Such high-sensitivity gas detectors for volatile sulfur compounds have wide ranging applications in areas such as volcanic eruption prediction, food inspection, environmental analysis, and medical diagnostics.
一种含有亚稳态银离子的聚电解质膜被用作石英晶体微天平（QCM）气体探测器。该聚电解质膜是通过将具有大量胺基的聚电解质浸入金属离子溶液中获得的。带有银离子的 QCM 探测器对极低浓度的甲硫醇气体（20ppb）有响应，但对氨、挥发性胺、芳香族化合物或醇没有响应。QCM 探测器的响应速度随着甲硫醇浓度的增加而逐渐增加。高灵敏度和选择性的响应是由亚稳态银离子与聚电解质膜中胺基之间形成配位键引起的配体取代反应所促进的。据我们所知，该系统是已报道的 QCM 气体探测器中灵敏度最高的。这种对挥发性硫化合物的高灵敏度气体探测器在火山爆发预测、食品检测、环境分析和医疗诊断等领域有广泛的应用。
