Electroluminescent Properties of Zero-dimensional Tungsten Oxide Quantum Dots

Tungsten oxide has outstanding electrochromic, photochromic, thermochromic and catalytic properties. It is confirmed that reducing the particle size of traditional electrode materials to zero dimension will greatly enhance the material and charge transport process, and it is expected to expand the application of quantum dots in the field of ultra-fast response electrochemical devices. Zero-dimensional tungsten oxide quantum dots can greatly improve the electroluminescent properties of tungsten oxide. The preparation process of tungsten oxide quantum dots includes the following steps:

(1)Weighing 0.03g tungsten sulfide (WS₂) and adding 200 mL 65 ℃ secondary distilled water to ultrasonic cleaner (power 400 W) for 15-24 hours. The filter cake was obtained by filtering through a sand core funnel with a pore size of 0.22 um, and then the collected filter cake was suspended heavily in 30 mL secondary distilled water. The above solution was placed in a polytetrafluoroethylene autoclave, heated for 12 to 18 hours at 200 ℃, then cooled to room temperature to obtain hydrothermal products. The solution of tungsten oxide quantum dots can be obtained by filtering the hydrothermal products through a sand core funnel with a pore size of 0.22 micron and collecting filtrate. The solid powder of tungsten oxide quantum dots can be obtained by suspension, ethanol dispersion and centrifugation.

(2) Preparation of Tungsten Oxide Quantum Dot Material Modified Electrode
The glassy carbon electrode was polished with 1.0, 0.3 and 0.05 micron Al₂O₃ powder, polished and polished to a smooth mirror surface, then put into HNO3 solution (1:1), anhydrous ethanol, ultrasonic cleaning in deionized water for 3 minutes, and N₂ drying. Tungsten oxide quantum dot modified electrode was prepared by dropping 6 mu L tungsten oxide quantum dot material onto the surface of treated glassy carbon electrode and drying at room temperature.

(3) Generation and detection of electrochemiluminescence signals in tungsten oxide quantum dots
A three-electrode system was used to measure the electrochemiluminescent (ECL) signals on the surface of the working electrode. The tungsten oxide quantum dot modified glassy carbon electrode was used as the working electrode, the platinum wire electrode was used as the working electrode, and Ag/AgCl was used as the reference electrode. The electrodes were inserted into the buffer solution containing the co-reactant, and a linear scanning voltage of 0-2.0V was applied. The high voltage of the photomultiplier tube was set to 600-800V.

(4)The electrodes were inserted into buffer solution containing co-reactants, such as potassium persulfate or ammonia persulfate, and applied a linear scanning voltage of 0-2.0V to generate electrochemical radiation on the working electrode surface.

• < Prev
• Next >