Method for preparation of plasma-treated nanofiber-based hydrogen gas sensing material

A method for preparation of a plasma-treated nanofiber-based hydrogen gas sensing material, comprising the following steps:

• (1) stirring a mixed solution of absolute ethanol, polyvinyl pyrrolidone (PVP), N,N-dimethylformamide (DMF), SnCl2·H2O, and Zn(CH3COO)2·2H2O uniformly on a constant-temperature magnetic stirrer to obtain a spinning solution;
• (2) electrospinning the spinning solution and depositing on an aluminum foil to obtain a spinning fiber;
• (3) annealing the spinning fiber in a muffle furnace to obtain a hydrogen gas sensing material sample;
• and
• (4) subjecting the hydrogen gas sensing material sample to a vacuum argon plasma treatment with a Hall ion source to obtain the nanofiber-based hydrogen gas sensing material,
• wherein in step (1), the SnCl2·H2O and the Zn(CH3COO)2·2H2O have a mass ratio of (1-1.6):(1-1.6), and the absolute ethanol, the DMF, and the PVP have a volume ratio of (1-1.5):(1-1.5):(1-1.5), and
• wherein in step (4), the vacuum argon plasma treatment comprises the following steps:
• placing the hydrogen gas sensing material sample into a vacuum chamber;
• conducting vacuumization with an air pump and a molecular pump to a vacuum degree of 5×10−3 Pa, and introducing 3 sccm to 5 sccm of argon gas into the vacuum chamber to keep the vacuum degree at 1×10−2 Pa to 5×10−2 Pa;
• turning on the Hall ion source, adjusting an anode voltage and an anode current, starting timing, and recording a cathode voltage and a cathode current;
• and when the treatment is completed, turning off the Hall ion source, introducing nitrogen gas, opening the vacuum chamber, and removing the sample to complete the vacuum argon plasma treatment;
• wherein the vacuum argon plasma treatment is conducted at a cathode voltage of 10 V to 15 V, a cathode current of 8.0 A to 10.0 A, an anode voltage of 120 V to 150 V, and an anode current of 1.0 A to 1.9 A for 5 min to 20 min.