Nanocrystalline Sb-doped SnO2 films modified with cyclometalated ruthenium complexes for two-step electrochromism. Issue 6 (24th January 2019)

• Record Type: Journal Article
• Authors: Li, Zhi-Juan; Shao, Jiang-Yang; Wu, Si-Hai; Zhong, Yu-Wu
• Is Part Of: Dalton transactions. Volume 48:Issue 6(2019)
• Page Start: 2197
• Page End: 2205
• Publication Date: 2019-01-24
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c8dt04968h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Sb-Doped SnO2 films modified with redox-active cyclometalated ruthenium complexes show two-step electrochromism in the near infrared region with a rapid response and good contrast ratio. Abstract : Sb-Doped nanocrystalline SnO2 (SnO2 :Sb) thin films functionalized with cyclometalated ruthenium complexes1 or2 on FTO conductive glasses have been prepared and characterized. These complexes contain a redox-active amine unit separated from the ruthenium ion by a phenyl or biphenyl linker, respectively, to modify the absorption wavelengths at different redox states. Near-infrared electrochromism of both films has been examined by oxidative spectroelectrochemical measurements and double-potential-step chronoamperometry. A contrast ratio (Δ T %) of 33% at 1070 nm and 63% at 696 nm has been achieved for the SnO2 :Sb/1 film in two stepwise oxidation processes, respectively. The other film with complex2 shows two-step electrochromism at 1310 and 806 nm with Δ T % of 36% and 76%, respectively. The response time of electrochromic switching is around a few seconds. Taking advantage of the good contrast ratio, the rapid response, and the long retention time of each oxidation state, these films have been successfully used to demonstrate surface-confined flip-flop memory functions with a high ON/OFF ratio.