title: Thiolate-assisted cation exchange reaction for the synthesis of near-infrared photoluminescent Hg(x)Cd(1-x)Te nanocrystals.
abstract: In this paper, we report the synthesis of dot- and branch-shaped Hg(x)Cd(1-x)Te nanocrystals (NCs) with good stability and a high quantum yield of about 30% through an elaborate cation exchange reaction at room temperature. The large red-shifts in both absorption spectra and photoluminescence (PL) spectra confirmed the substitution of mercury ions for cadmium ions and the formation of Hg(x)Cd(1-x)Te NCs. Interesting periodical XRD peaks observed in as-obtained Hg(x)Cd(1-x)Te NCs indicated the formation of layered metal thiolates, which not only played a key role in introducing mercury ions during the cation exchange process, but also acted as ligands to maintain the emission stability of newly formed Hg(x)Cd(1-x)Te NCs. The results indicate that the red-shift in PL emission has close-correlation with several parameters (such as the amounts of thiols and mercury ions, the sample store time, etc.).
authors.affiliation: Key Laboratory for Special Functional Materials, Henan University, Kaifeng 475004, P. R. China.
authors.forename: Hongzhe
authors.initials: H
authors.lastname: Wang
authors.forename: Shiyun
authors.initials: S
authors.lastname: Lou
authors.forename: Zhaojun
authors.initials: Z
authors.lastname: Tang
authors.forename: Weiwei
authors.initials: W
authors.lastname: Xu
authors.forename: Hangying
authors.initials: H
authors.lastname: Shang
authors.forename: Huaibin
authors.initials: H
authors.lastname: Shen
authors.forename: Lin Song
authors.initials: LS
authors.lastname: Li