Tecnai g2 f30

The nHA powder (0.1 g) was dispersed in ethanol in an ultrasonic bath (ThermoFisher, Shanghai, China) for 1 h and a drop was placed onto a copper mounting grid with carbon film and allowed to dry under ambient conditions. Samples were then imaged on a transmission electron microscope (Tecnai G2 F30, ThermoFisher, Shanghai, China) under standard imaging and EDX detecting elements Ca, P, Ag, and O. EDX settings used were 20 kV, takeoff 14.8, amp time 7 µs, and 126.5 eV resolution.

X-ray diffraction (XRD) pattern of as-prepared samples was collected with a Bruker D8 X-ray diffractometer (Bruker, Billerica, MA, USA) with Cu kα (wavelength = 1.5406 Å). The scanning electronic microscopy (SEM, Carl Zeiss AG, Oberkochen, Germany) of as-prepared samples was conducted by using a ZEISS SUPRA® 55 scanning electron microscope. The transmission electron microscopy (TEM, FEI, Hillsboro, OR, USA) images were collected on FEI T12 transmission electron microscope (working at 80 kV acceleration voltage). High resolution TEM (HRTEM) and element mapping analysis were performed on Tecnai G2 F30 transmission electron microscope (Thermo Fisher Scientific, Waltham, MA, USA). The UV-vis spectra were measured on UV-2600 (SHIMADZU, Kyoto, Japan).

MoS₂ nanosheets with different crystalline order were synthesized by the hydrothermal method. Sodium molybdate dihydrate, 1.5 g, and thioacetamide, 2.2 g, were dissolved together in 50 ml of deionized water and stirred for 2 h. Then, the solution was transferred into a Teflon-lined stainless steel autoclave and reacted at different temperatures (180°C, 200°C, 220°C and 240°C) for 24 h. Finally, the products were filtered and washed with water and dried in a vacuum.
X-ray diffraction (XRD, X'Pert PRO PHILIPS with Cu K_α radiation) was employed to study the crystal structure. The morphology of the samples was obtained by using the high-resolution transmission electron microscopy (HRTEM, TecnaiTM G2 F30, FEI, Hillsboro, OR, USA). X-ray photoelectron spectroscopy (XPS, Kratos Axis Ultra, Manchester, UK) was utilized to determine the bonding characteristics of the samples. The composition was confirmed by an inductively coupled plasma atomic emission spectrometer (ICP, ER/S). The measurements of magnetic properties were made using the Quantum Design MPMS magnetometer based on superconducting quantum interference device (SQUID).

The X-ray diffraction (XRD, X′ Pert PRO PHILIPS with Cu Kα radiation) was employed to study the structure of the samples. The morphologies of the samples were characterized by the transmission electron microscope (TEM; Tecnai TMG2F30, FEI, Hillsboro, OR, USA) equipped with energy-dispersive X-ray spectrum (EDS). The measurements of magnetic properties were made using the vibrating sample magnetometer (VSM; micorsense, EV9), and a Quantum Design MPMS magnetometer based on a superconducting quantum interference device (SQUID; San Diego, CA, USA). Mössbauer measurements were performed using conventional constant acceleration type spectrometer in transmission geometry. The gamma-ray source is 25 mCi57Co in Palladium matrix and the driver velocity was calibrated using an α-Fe foil. The dielectric properties of the samples were measured using an Agilent 4092A precision impedance analyzer in the temperature range from 230 to 400 K.

A unified method was provided using a simple and convenient route to assemble γ-Fe₂O₃ nano-particles. Ferric nitrate was dissolved in Dimethyl Formamide (DMF), the precursor was 0.6 mol/L, and calcined at different temperature (100 °C~400 °C, the interval is 50 °C) for 2 hours in the air. The heating rate was 1 °C/min. The schematic diagram of experiment is shown in Fig. 1.
The crystal structure of samples were measured by X-ray diffraction (XRD, PANalytical X’Pert) equipped with Cu-Kα radiation (λ = 1.5406 Å). The morphology of all samples was observed by using field emission scanning electron microscopy (FESEM, Hitachi S-4800) and transmission electron microscopy (TEM, Tecnai^TM G² F30, FEI) equipped with an energy-dispersive spectrometer (EDS). The X-ray photoelectron spectroscopy (XPS, PHI-5702, Physical Electronics) were performed using a monochromatic Al-Kα irradiation and a charge neutralizer. All binding energies were referred to the C1 s peak at 284.6 eV of the surface adventitious carbon. The magnetic properties of the samples were measured by a vibrating sample magnetometer (VSM, Lakeshore 7304). The measurement process of surface areas and photocatalytic activity of the sample were shown in the Supporting Information (SI).

The morphologies and microstructures of all samples were observed by field emission scanning electron microscopy (FESEM, Hitachi S4800, Japan) and transmission electron microscopy (TEM, FEI Tecnai^TM G² F30, USA) equipped with an energy dispersive X-ray spectroscopy (EDX, Oxford Instrument, UK). The phase components, elements and corresponding chemical states were detected by powder X-ray diffraction on a X-ray diffractometer (XRD, Philips X’Pert Pro MPD, the Netherlands) with Cu-Kα irradiation (λ = 1.54056 Å), high-resolution transmission electron microscopy (HRTEM), EDX and X-ray photoelectron spectroscopy (XPS, Kratos AXIS Ultra^DLD, 600 W, UK) with an monochrome Al-Kα probe beam. All the recorded XPS spectra were calibrated using C 1 s peak with the binding energy of 284.8 eV and were analyzed through Gaussian-fitting. A vibrating sample magnetometer (VSM, Lakeshore 7403, USA) was used to investigate the room temperature magnetic properties of the samples.

The morphological and microstructural characterizations of the as-prepared SrFe₁₂O₁₉ nanoribbons were performed by applying field emission scanning electron microscopy (FESEM, Hitachi S-4800) and transmission electron microscopy (TEM, Tecnai^TM G² F30, FEI) equipped with an energy dispersive X-ray spectroscopy (EDX). The element and phase component and crystalline structure were determined using powdered X-ray diffraction (XRD, Analytical X’Pert Pro) with Cu-Kα radiation (λ = 0.15406 nm) and high-resolution transmission electron microscopy (HRTEM). Room temperature magnetic properties of the SrFe₁₂O₁₉ nanoribbons were investigated by using a vibrating sample magnetometer (VSM, Lakeshore 7403, USA).