Pure and Ti-doped NiO multiroom spheres were prepared via ultrasonic spray pyrolysis, and their gas sensing characteristics were investigated. The sensor using 10 at% Ti-doped NiO multiroom spheres exhibited an unprecedented high response (resistance ratio = 337.8) to 1 ppm p-xylene at 350 ℃, whereas the sensor using pure NiO multiroom spheres exhibited a negligibly low response (1.3). Moreover, the control of the Ti doping and film thickness provided intriguing strategies for tuning the xylene and methylbenzene sensing characteristics, such as the selectivity, response, sensitivity (slope between response and gas concentration), and detection limit. The versatile tunability on gas sensing characteristics was explained by the Ti-doping-induced variation of the oxygen adsorption, mesoporosity, specific surface area, and charge-carrier concentration, as well as the control over the reforming and oxidation of the analyte gases using the multiroom-structured micro-reactors with high catalytic activity.

通过超声喷雾热解法制备了纯Ti和掺杂Ti的NiO多室球，并研究了它们的气敏特性。使用10at％的Ti掺杂的NiO多室球的传感器表现出前所未有的高响应（电阻比= 337.8）至1 ppm p-二甲苯在350℃时，而使用纯NiO多室球的传感器则表现出微不足道的低响应（1.3）。此外，Ti掺杂和膜厚度的控制提供了有趣的策略，可用于调整二甲苯和甲基苯的感测特性，例如选择性，响应性，灵敏度（响应性和气体浓度之间的斜率）和检测极限。气体感测特性的通用可调性是由Ti掺杂引起的氧吸附，介孔率，比表面积和电荷载流子浓度的变化，以及通过使用碳纳米管控制分析物气体的重整和氧化来解释的。具有高催化活性的多室结构微反应器。