High-Response Room-Temperature NO2 Sensor and Ultrafast Humidity Sensor Based on SnO2 with Rich Oxygen Vacancy
High-Response Room-Temperature NO2 Sensor and Ultrafast Humidity Sensor Based on SnO2 with Rich Oxygen Vacancy
复制标题
基于富氧空位 SnO2 的高响应室温 NO2 传感器和超快湿度传感器
DOI：
10.1021/acsami.9b01737
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发表时间：
2019
影响因子：
9.5
通讯作者：
Zhu Hongwei
中科院分区：
文献类型：
--
作者：
Zhong Yujia;Li WeiWei;Zhao Xuanliang;Jiang Xin;Lin Shuyuan;Zhen Zhen;Chen Wenduo;Xie Dan;Zhu Hongwei
通过对SnSe纳米片在氩气中进行退火处理，成功地制备了含有大量空位的SnO 2纳米片（记为SnO 2-x）。透射电子显微镜（TEM）结果表明，SnO 2-x纳米片分布在无定形碳表面，其密度较高，尺寸为5-10 nm。退火后，所得SnO 2-x/非晶碳保持正方形形貌。Sn/O的化学计量比为1：1.55，证实了SnO 2纳米片中存在丰富的氧空位。所制备的SnO 2-x在室温下具有良好的NO2气敏性能。SnO 2-x基传感器对5 ppm NO2的响应为16，响应时间和恢复时间分别为331和1057 s，上级大多数报道的基于SnO 2和其他材料的室温NO2传感器。当湿度在30 ~ 40%范围内变化时，ΔR/R为0.025。超快的湿度响应（52 ms）和恢复（140 ms）与其他最先进的湿度传感器相比具有竞争力。机理研究表明，SnO_2-xis的优异传感性能与其特殊的结构有关。
SnO2nanosheets with abundant vacancies (designated as SnO2–x) have been successfully prepared by annealing SnSe nanosheets in Argon. The transmission electron microscopy results of the prepared SnO2nanosheets indicated that high-density SnO2–xnanoplates with the size of 5–10 nm were distributed on the surface of amorphous carbon. After annealing, the acquired SnO2–x/amorphous carbon retained the square morphology. The stoichiometric ratio of Sn/O = 1:1.55 confirmed that oxygen vacancies were abundant in SnO2nanosheets. The prepared SnO2–xexhibited excellent performance of sensing NO2at room temperature. The response of the SnO2–x-based sensor to 5 ppm NO2was determined to be 16 with the response time and recovery time of 331 and 1057 s, respectively, which is superior to those of most reported room-temperature NO2sensors based on SnO2and other materials. When the humidity varied from 30 to 40%, ΔR/Rwas 0.025. The ultrafast humidity response (52 ms) and recovery (140 ms) are competitive compared with other state-of-art humidity sensors. According to the mechanistic study, the excellent sensing performance of SnO2–xis attributed to its special structure.