Xia Yidan, Wu Zhaofeng, Qin Zhangjie, Chen Fengjuan, Lv Changwu, Zhang Min, Shaymurat Talgar, Duan Haiming
Xinjiang Key Laboratory of Solid State Physics and Devices, Xinjiang University, Urumqi 830046, China.
School of Physics Science and Technology, Xinjiang University, Urumqi 830046, China.
Nanomaterials (Basel). 2022 Mar 28;12(7):1105. doi: 10.3390/nano12071105.
Under the background of the Paris Agreement on reducing greenhouse gases, waste wools were converted into wool carbon fiber (WCF) and WCF-MoS composites by low-temperature catalytic hydrothermal carbonization. Their structures and gas-sensing performances were studied for the first time. Due to the existence of heterojunctions, the responses of the WCF-MoS composite to the five analytes were 3-400 times those of MoS and 2-11 times those of WCF. Interestingly, because of the N, P, and S elements contained in wools, the WCF prepared by the hydrothermal method was realized the doping of N, P, and S, which caused the sensing curves of WCF to have different shapes for different analytes. This characteristic was also well demonstrated by the WCF-MoS composite, which inspired us to realize the discriminative detection only by a single WCF-MoS sensor and image recognition technology. What's more, the WCF-MoS composite also showed a high sensitivity, a high selectivity, and a rapid response to NH. The response time and the recovery time to 3 ppm NH were about 16 and 5 s, respectively. The detection of limit of WCF-MoS for NH was 19.1 ppb. This work provides a new idea for the development of sensors and the resource utilization of wool waste.
在《巴黎协定》关于减少温室气体排放的背景下，通过低温催化水热碳化法将废弃羊毛转化为羊毛碳纤维（WCF）和WCF-MoS复合材料。首次对它们的结构和气敏性能进行了研究。由于异质结的存在，WCF-MoS复合材料对五种分析物的响应分别是MoS的3至400倍以及WCF的2至11倍。有趣的是，由于羊毛中含有N、P和S元素，通过水热法制备的WCF实现了N、P和S的掺杂，这使得WCF对不同分析物的传感曲线具有不同形状。WCF-MoS复合材料也很好地证明了这一特性，这启发我们仅通过单个WCF-MoS传感器和图像识别技术就能实现鉴别检测。此外，WCF-MoS复合材料对NH还表现出高灵敏度、高选择性和快速响应。对3 ppm NH的响应时间和恢复时间分别约为16秒和5秒。WCF-MoS对NH的检测限为19.1 ppb。这项工作为传感器的开发和羊毛废弃物的资源利用提供了新思路。
