Jsm 6701f

OM (Olympus DX51), Raman spectroscopy (HORIBA, Lab Ram ARAMIS; 532-nm laser excitation wavelength), AFM (VEECO, Multimode), PL (SPEX1403, SPEX; 532-nm laser excitation wavelength), absorbance with ultraviolet–visible spectrophotometer (JASCO Corporation, V-650), XPS (Thermo UK, K-alpha), SEM (JEOL Ltd, JSM-6701F), TEM (FEI Titan G2 Cube 60-300; accelerating voltage, 80 kV), STEM and EDX (JEM 2100F; accelerating voltage, 200 kV) analyses were employed to characterize the MoS₂ and Mo_1−xW_xS₂ alloy, and a VCC Mo_1−xW_xS₂ multilayer.

X-ray diffraction (XRD) was recorded by X-ray diffractometer (Bruker D8) with Cu Kα radiation. The samples' morphologies were characterized by field emission scanning electron microscopy (JSM 6701F) and high-resolution transmission electron microscopy (HRTEM, FEI Tecnai G2 F20 S-TWIN). X-ray photoelectron spectroscopy (XPS) was collected on ESCALAB 250Xi to identify the chemical compositions and the chemical states of the sample. UV-vis diffuse reflectance spectra (DRS) of the samples were acquired using BaSO₄ as a reference material by a PerkinElmer Lambda 950 UV-vis spectrophotometer. Steady-state and time-resolved photoluminescence spectra (PL) were performed on FLS 920 fluorescence spectrometer.

The morphologies of pristine and printed filter papers were observed by scanning electron microscopy (SEM, JSM-6701F, Japan), and TEM images were obtained on a FEI Tecnai G2 F30 transmission electronic microscope. Fourier transform infrared (FT-IR) spectroscopy was performed to investigate the characteristics of the specimens with KBr pellets on a Nicolet is10 instrument (Thermo Scientific). Water-droplet contact angle (CA) values were acquired using a DSA-100 optical contact-angle meter (Kruss Co., Ltd., Germany) at ambient temperature. A 10 μL amount of deionized water, juice, coffee and milk was dropped onto the samples using an automatic dispense controller, respectively and the CAs were determined automatically using the Laplace-Young fitting algorithm. Average CA values were obtained by measuring the sample at five different positions, and all the images were captured with a digital camera (Sony, Ltd., Japan).