Otgonbayar Zambaga, Jun Joo Young, Youn Cho Kwang, Yul Park Sang, Youl Park Kwang, Oh Won-Chun
Department of Advanced Materials Science and Engineering, Hanseo University, Seosan-si, Chungnam, 356-706, Korea.
Korea Institutes of Ceramic Engineering and Technology, Gyeongsangnam-do, Soho-ro, Jinju-Si, South Korea.
Sci Rep. 2022 May 4;12(1):7241. doi: 10.1038/s41598-022-11000-6.
The gas sensing ability of a pure β-SiC fiber is limited due to its low-sensitivity and selectivity with poor recovery time during a gas sensing test. The combination of functional β-SiC fibers with metal-oxide (MO) can lead to excellent electronic conductivity, boosted chemical activity, and high reaction activity with the target gas and β-SiC-InO sensor material. Influence factors such as amounts of MO, current collectors, and gas species (CO, O and without gas) for the gas sensing ability of β-SiC-InO nanocomposite were determined at standard room temperature (25 °C) and high temperature (350 °C) conditions. The gas sensing ability of the functional β-SiC fiber was significantly enhanced by the loading of InO metal-oxide. In addition, the MO junction on the β-SiC fiber was mainly subjected to the Si-C-O-In bond sensor layer with an effective electron-transfer ability. The gas sensing mechanism was based on the transfer of charges, in which the sensing material acted as an absorber or a donor of charges. The sensor material could use different current- collectors to support the electron transfer and gas sensing ability of the material. A 1:0.5M SiC-InO coated Ni-foil current collector sensor showed better sensing ability for CO and O gases than other gas sensors at room temperature and high temperature conditions. The sensing result of the electrode was obtained with different current density values without or with gas purging conditions because CO and O gases had electron acceptor properties. During the gas sensing test, the sensor material donated electrons to target gases. The current value on the CV graph then significantly changed. Our obtained sample analysis data and the gas sensing test adequately demonstrated that MO junctions on functional β-SiC fibers could improve the sensitivity of a sensor material and particularly upgrade the sensor material for gas sensing.
纯β-SiC纤维的气敏能力有限，因为在气敏测试中其灵敏度低、选择性差且恢复时间长。功能性β-SiC纤维与金属氧化物（MO）的结合可产生优异的电子导电性、增强的化学活性以及与目标气体和β-SiC-InO传感材料的高反应活性。在标准室温（25°C）和高温（350°C）条件下，确定了诸如MO的量、集电器和气体种类（CO、O和无气体）等影响因素对β-SiC-InO纳米复合材料气敏能力的影响。InO金属氧化物的负载显著提高了功能性β-SiC纤维的气敏能力。此外，β-SiC纤维上的MO结主要受具有有效电子转移能力的Si-C-O-In键传感层影响。气敏机制基于电荷转移，其中传感材料充当电荷的吸收体或供体。传感器材料可以使用不同的集电器来支持材料的电子转移和气敏能力。在室温和高温条件下，1:0.5M SiC-InO涂覆的镍箔集电器传感器对CO和O气体的传感能力优于其他气体传感器。在有或无气体吹扫条件下，通过不同的电流密度值获得了电极的传感结果，因为CO和O气体具有电子受体特性。在气敏测试期间，传感器材料向目标气体提供电子。然后CV图上的电流值发生显著变化。我们获得的样品分析数据和气敏测试充分证明，功能性β-SiC纤维上的MO结可以提高传感器材料的灵敏度，特别是提升用于气敏的传感器材料。
