Nicolet is50 fourier transform infrared ftir

Vibrational information of the dopant and the Matrimid/g-C₃N₄ MMMs was retrieved by using a Thermo Scientific (Waltham, MA, USA) Nicolet iS50 Fourier-Transform Infrared (FTIR) spectrometer. 8–10 mm Ø samples were cut from the films and their transmittance was measured at room temperature in a scanning range between 410 and 4000 cm⁻¹, with a 1 cm⁻¹ spectral resolution and 64 scans.
The morphology of the as-prepared samples was examined using field emission scanning electron microscopy (FESEM), with a FEI (Hillsboro, OR, USA) QUANTA 200F device.
Thermogravimetric analysis (TG) was used to determine the thermal and/or oxidative stability of the materials. TG experiments were performed with a Mettler Toledo (Columbus, OH, USA) DMA/SDTA 861 device, heating the samples from 50 °C to 850 °C at a heating rate of 10 °C·min⁻¹, under a N₂ flow of 20 cm³·min⁻¹.

Fe₃O₄ was supplied by Promega Ltd. Dopamine hydrochloride was purchased from Aladdin Chemistry Co. Ltd. (Shanghai, China). Polyethyleneimine (PEI, M.W. 600,000–1,000,000, 50%) was bought from Sigma-Aldrich Co. (Shanghai, China). Deionized (DI) water (18.2 MΩ cm) was purified by a Smart-Q deionized water system (Hitech Pure Water Technology, Shanghai, China) and used in all aqueous solutions. Luria-Bertani (LB) medium was from Beijing Land Bridge Technology Co., Ltd. (Beijing, China).
Scanning electron microscopy (SEM) was conducted via UHR FE-SEM SU8020 (Hitachi, Japan). The morphologies of the as-prepared materials were indicated by transmission electron microscopy (TEM, FEI Tecnai G2 F30, Hillsboro, OR, USA). Infrared analysis was conducted with a Nicolet IS50 Fourier transform infrared FT-IR (Thermofisher, Waltham, MA, USA). The zeta-potential was determined by the Malvern Nano Z Zetasizer. Bacteria were cultured by the RTS-1 Fully Automatic Biological Growth Monitoring Reactor (Republic of Latvia). ATP bioluminescence was detected by Lumitester Smart (Kikkoman Biochemifa Co., Noda, Japan). Escherichia coli (E. coli ATCC8739) and Bacillus subtilis (ATCC6633) were purchased from Guangdong culture Collectioncenter of Microbiology.