Gatty Hithesh K, Stemme Göran, Roxhed Niclas
Micro and Nanosystems, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
Micromachines (Basel). 2018 Nov 22;9(12):612. doi: 10.3390/mi9120612.
Bad breath or halitosis affects a majority of the population from time to time, causing personal discomfort and social embarrassment. Here, we report on a miniaturized, microelectromechanical systems (MEMS)-based, amperometric hydrogen sulfide (H₂S) sensor that potentially allows bad breath quantification through a small handheld device. The sensor is designed to detect H₂S gas in the order of parts-per-billion (ppb) and has a measured sensitivity of 0.65 nA/ppb with a response time of 21 s. The sensor was found to be selective to NO and NH₃ gases, which are normally present in the oral breath of adults. The ppb-level detection capability of the integrated sensor, combined with its relatively fast response and high sensitivity to H₂S, makes the sensor potentially applicable for oral breath monitoring.
口臭或口气不佳不时影响着大多数人，会导致个人不适和社交尴尬。在此，我们报告一种基于微机电系统（MEMS）的小型化安培型硫化氢（H₂S）传感器，它有可能通过小型手持设备实现口臭量化。该传感器设计用于检测十亿分之一（ppb）级别的H₂S气体，测量灵敏度为0.65 nA/ppb，响应时间为21秒。研究发现该传感器对通常存在于成年人呼出气体中的NO和NH₃气体具有选择性。集成传感器的ppb级检测能力，加上其对H₂S相对快速的响应和高灵敏度，使得该传感器具有用于口腔呼出气体监测的潜力。
