The Preparation And Electrochemiluminescence Performance Research Of The Tungsten Trioxide Nanocrystals

The electrochemiluminescence （ECL） of semiconductor nanocrystals (_NCs), whichcombines the merits of semiconductor, electrochemistry and chemiluminescence, has becomea new field of ECL analysis and developed rapidly since Bard observed the ECL phenomenaof semiconductor_NCs. During the past several years, the researchers have observed more andmore senmincoductor_NCs can produce ECL phenomena and prepared the solid state ECLsensor which is applied to bioanalysis and evironmental analysis based on the ECL ofsenmincoductor_NCs. Tungsten trioxide （WO₃） has been paid considerable attentationbecause of the excellent electrochromism, gaschromism, thermochromism, photochromismand et al. However, it is noted that the ECL behavior of WO₃have rarely been reported. Inthis article, we synthesized the WO₃NC_s and MWCNT/（WO₃）_NCscomposite, and researchedtheir ECL performance. In addition, we also prepared the ECL sensor of MWCNT/（WO₃）_NCscomposite and searched its performace and application.The WO₃NC_s were synthesized by a hydrothermal and high temperature calcinationsmethod and characterized by SEM, XRD, XPS, UV-vis and PL. Also, the （WO₃）_NCs/Nafionfilm modified electrode was prepared based on fixing the WO₃NC_s on the surface ofelectrode with the help of Nafion and the ECL behavior of WO₃NC_s was reseracehed withthe home-made ECL testing instrument. The results show the WO₃NC_s have good ECLbehavior. One ECL peak was obeserved in the buffer solution without the presence oftripropylamine （TPrA）, but two ECL peaks were obeserved in the buffer solution with thepresence of TPrA. Furthmore, the possible ECL mechanisms of WO₃NC_s were proposed.The MWCNT/（WO₃）_NCscomposite were synthesized by a ethanol reflux and hightemperature calcinations method, and characterized by XRD, EDS, SEM, UV-vis and PL.Also, the MWCNT/（WO₃）_NCs/Nafion film modified electrode was prepared based on fixingthe MWCNT/（WO₃）_NCscomposite on the surface of electrode with the help of Nafion and theECL behavior of MWCNT/（WO₃）_NCscomposite was reseracehed with the home-made ECLtesting instrument. The results show MWCNT/（WO₃）_NCscomposite have good ECL behavior.Two ECL peaks were obeserved in the buffer solution with the presence of TPrA and the ECL mechanisms of MWCNT/（WO₃）_NCscomposite are coordinated with the ECL mechanisms ofWO₃NC_s. In addition, the ECL intensity of MWCNT/（WO₃）_NCscomposite is higher than theECL intenstity of WO₃NC_s produced by the same method. Therefore, MWCNT/（WO₃）_NCscomposite made by this method not only have good ECL performance but also provide anexcellent material for ECL sensor.The ECL sensor of MWCNT/（WO₃）_NCscomposite was constructed by means of theMWCNT/（WO₃）_NCs/Nafion film modified electrode. The stability of the ECL sensor wasresearched in order to evaluate the application aspect. The results show the ECL sensor ofMWCNT/（WO₃）_NCscomposite has excellent stability and can test the N, N-dimethyl aminomethyl ferrocene (the range of linearity is10-9⁵×10-8mol/L, the limit of detection is...