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(a) UV-vis diffuse reflectance spectra; (b) photocurrent of ZnO, CdS NPs and the CdS NPs/ZnO A, B, C and D (A, B, C and D: mass ratios of CdS/ZnO were 0.063:1, 0.079:1, 0.100:1 and 0.330:1, respectively); (c) Formaldehyde sensing response under visible light illumination of CdS and CdS NPs/ZnO C. Reproduced with permission from [10].
