采用电化学去合金法制得50 nm的超薄纳米多孔金膜（Nanoporous Gold Film，NPGF），其表面粗糙度可预估NPGF的表面形貌. SEM表征证实，在扫描下限大于-0.1 V时，控制伏安扫描的循环周数可获得不同粗糙度的NPGF. 利用反射紫外可见光谱研究了NPGF的局域表面等离子体效应（LSPR）. 结果显示，NPGF在450 nm处的LSPR效应受其表面粗糙度影响，在优化的粗糙度下，NPGF的局域表面等离子体效应可实现乙二醇溶液浓度的定量检测.

Ultrathin nanoporous gold films (NPGF) with a thickness of approximately 50 nm were fabricated via electrochemical dealloy method. The morphology of NPGF was evaluated with a parameter of surface roughness. SEM results demonstrate that the fabrication of NPGF with different roughness factors can be achieved by controlling the circles of cyclic voltammetry. UV-Vis spectra indicate that the localized surface plasmon resonance (LSPR) of NPGF is affected by the roughness of NPGF. With the optimal roughness factor, NPGF displays a linear relationship between the ethanediol concentration and the absorbance intensity at λ = 450 nm. The LSPR effect of NPGF presents potential applications in quantitative detection of solution concentration.