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Surface engineering of electrodeposited cuprous oxide (Cu2O) thin films: Effect on hydrophobicity and LP gas sensing
Applied Surface Science ( IF 6.7 ) Pub Date : 2021-05-09 , DOI: 10.1016/j.apsusc.2021.150020
K.N.D. Bandara , K.M.D.C. Jayathilaka , D.P. Dissanayake , J.K.D.S. Jayanetti

P-type cuprous oxide thin films electrodeposited on a titanium substrate in a lactate bath was investigated for liquid petroleum gas (LPG) sensing. Contact angle measurements using water droplets revealed that the surfaces of the films become progressively hydrophobic with increasing deposition bath pH. The films deposited at pH = 10 were sensitive for LPG even at room temperature (30 °C). X-ray diffraction (XRD) and scanning electron microscopy (SEM) were performed to investigate the crystalline structure and the surface morphology of Cu2O films. According to the XRD patterns, the films had a preferred orientation along the (2 0 0) and (1 1 1) planes. The normalized intensity of (2 0 0) XRD peak increased with the deposition bath pH and reached its maximum value around pH = 11. It was also observed that the LPG sensitivity of the Cu2O films closely followed the normalized intensity of (200) peak. SEM images of Cu2O films showed the presence of well-defined crystallites with sharp edges. Atomic force microscopy (AFM) analysis showed that the surface roughness increased with deposition bath pH. Energy Dispersive X-ray analysis (EDAX) was used for compositional analysis of films and Mott - Schottky plots and spectral response measurements were carried out to confirm the p-type conductivity.



中文翻译:

电沉积氧化亚铜(Cu 2 O)薄膜的表面工程:对疏水性和LP气敏的影响

研究了在乳酸盐浴中电沉积在钛基底上的P型氧化亚铜薄膜用于液化石油气(LPG)的感测。使用水滴的接触角测量表明,随着沉积浴pH值的增加,薄膜的表面逐渐变得疏水。pH = 10时沉积的薄膜即使在室温(30°C)时对LPG也是敏感的。用X射线衍射(XRD)和扫描电子显微镜(SEM)研究了Cu 2 O薄膜的晶体结构和表面形貌。根据XRD图谱,膜具有沿(2  0  0)和(1  1  1)平面的优选取向。归一化强度为(2  0 0)XRD峰随沉积浴pH的增加而增加,并在pH = 11时达到最大值。还观察到Cu 2 O膜的LPG灵敏度紧随(200)峰的归一化强度。Cu 2 O膜的SEM图像显示存在边缘清晰的微晶。原子力显微镜(AFM)分析表明,表面粗糙度随沉积浴pH值的增加而增加。能量色散X射线分析(EDAX)用于薄膜的成分分析,并进行Mott-Schottky图和光谱响应测量以确认p型电导率。

更新日期:2021-05-15
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