Sikarwar Samiksha, Yadav B C, Dzhardimalieva G I, Golubeva N D, Srivastava Pankaj
Nanomaterials and Sensors Research Laboratory, Department of Physics, Babasaheb Bhimrao Ambedkar University Lucknow-226025 U.P. India
Laboratory of Metallopolymers, Institute of Problems of Chemical Physics, Russian Academy of Sciences Chernogolovka Moscow Region 142432 Russia.
RSC Adv. 2018 Jun 5;8(37):20534-20542. doi: 10.1039/c8ra01975d.
Metal carboxylates are widely used in science and technology and have been the subject of intense studies due to the practical importance of their products. The present paper reports the synthesis of MnO-CoO using metal carboxylates as precursors and the effect of humidity on the transmitted power through its thin film at room temperature. The refractive index of the material was found to be 1.445930 and the peak obtained from the photoluminescence spectra lies in the visible region. TEM reported a minimum grain size of ∼5.7 nm and SAED confirmed the crystalline nature of the material, which was further confirmed by XRD. Fluorescence characteristics also confirmed the low dimensionality of the material. The film was then investigated using SEM which exhibited the porous morphology. Through UV-Vis spectroscopy, it was found that the absorption of the film takes place in the UV region and the optical band-gap was observed to be 3.849 eV from the Tauc plot. The film was employed as a transmission based opto-electronic humidity sensor. Average sensitivity was found to be ∼2.225 μW/% RH with response and recovery times of 47 s and 59 s respectively. Experiments were repeated and the reproducibility of result was found to be ∼89%.
金属羧酸盐在科学技术中有着广泛的应用，由于其产物具有实际重要性，一直是深入研究的对象。本文报道了以金属羧酸盐为前驱体合成MnO-CoO以及湿度对其室温下通过薄膜的传输功率的影响。发现该材料的折射率为1.445930，光致发光光谱得到的峰值位于可见光区域。透射电子显微镜报告最小晶粒尺寸约为5.7 nm，选区电子衍射证实了该材料的晶体性质，X射线衍射进一步证实了这一点。荧光特性也证实了该材料的低维特性。然后使用扫描电子显微镜对该薄膜进行研究，其呈现出多孔形态。通过紫外-可见光谱发现，该薄膜在紫外区域有吸收，从Tauc图中观察到光学带隙为3.849 eV。该薄膜被用作基于传输的光电湿度传感器。发现平均灵敏度约为2.225 μW/%RH，响应时间和恢复时间分别为47 s和59 s。重复进行实验，发现结果的重现性约为89%。
