Water Adsorption to Crystalline Cu2O Thin Films: Structural and Vibrational Properties
Water Adsorption to Crystalline Cu2O Thin Films: Structural and Vibrational Properties
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DOI：
10.1021/acs.jpcc.7b10835
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发表时间：
2018-02-01
影响因子：
3.7
通讯作者：
Nilius, N.
中科院分区：
文献类型：
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作者：
Moeller, C.;Barreto, J.;Nilius, N.
用扫描隧道显微镜、热脱附和红外吸收光谱研究了D2 O在有序Cu 2 O（111）薄膜上的吸附。这些分子与氧化物表面结合，由此第一D2 O层由于界面氢键而经历稍微更强的粘附。在较高的覆盖率下，无定形固体水（ASW）膜凝聚在Cu 2 O（111）表面上，从155 K的主要解吸峰和中心在2540 cm（-1）的宽振动带得出结论。在裸Au（111）上也观察到了ASW的发展，该裸Au（111）被用作Cu_2O生长的衬底。相反，氧化物表面，没有结合增强检测到的D2 O单层和解吸是伴随着去湿和转化为结晶冰。水的不同结合模式分别反映了Cu_2 O（111）和相对于疏水性Au（111）载体的亲水性。
D2O adsorption to well-ordered Cu2O(111) thin films has been explored with scanning tunneling microscopy, thermal desorption and infrared absorption spectroscopy. The molecules bind associatively to the oxide surface, whereby the first D2O layer experiences slightly stronger adhesion due to interfacial hydrogen bonds. At higher coverage, amorphous solid water (ASW) films condense on the Cu2O(111) surface, as concluded from a dominant 155 K desorption peak and a broad vibrational band centered at 2540 cm(-1). Development of ASW is also observed on bare Au(111), being used as substrate for Cu2O growth. In contrast to the oxide surface, no binding enhancement is detected for the D2O monolayer and desorption is accompanied by dewetting and transformation to crystalline ice. The different binding schemes of water reflect the hydrophilic character of Cu2O(111) and versus hydrophobic Au(111) supports, respectively.