在乙酰胺-尿素-NaBr-KBr熔体中电沉积纳米Zn-Sb合金

应用循环伏安法研究Zn(II)和Sb(III)在乙酰胺-尿素-NaB r-KB r熔体(343 K)中的电还原.实验表明,Zn(II)和Sb(III)各自还原为金属都是不可逆过程.Zn(II)+2 e→Zn和Sb(III)+3 e→Sb的传递系数分别为0.231和0.319,Zn(II)和Sb(III)在熔体中的扩散系数分别为1.70×10-6和3.21×10-6cm2.s-1.在乙酰胺-尿素-NaB r-KB r熔体中,调节沉积电位和ZnC l2∶SbC l3(摩尔浓度比),得到Zn含量从29.67%变化到97.34%(by at.ratio)的纳米Zn-Sb合金膜.扫描电镜观测Zn-Sb膜的形态,Zn-Sb沉积膜颗粒大小均匀,粒径在50 nm左右.

Electrodeposition of Nano-Sb-Zn Alloy in Acetamide-urea-NaBr-KBr Melt

The electroreduction of Zn(II) and Sb(III) in acetamide-urea-NaBr-KBr(343 K) were studied by cyclic volatmmetry.The reduction of Zn(II) or Sb(III) to the metals is an irreversible process.The transfer coefficient of Zn(II)+2e→Zn and Sb(III) +3e→Sb were calculated to be 0.231 and 0.319,the diffusion coefficient of Zn(II) and Sb(III) in the melt were determined as 1.70 10~(-6) and 3.21 10~(-6) cm~(2)· s~(-1) respectively.The Zn-Sb films with different Zn content from 29.67 at% to 97.34 at% were electrodeposited in acetamide-urea-NaBr-KBr melt at 343 K by controlling the deposition potential and the Zn(II)/Sb(III) molar ratio.The morphology of Zn-Sb film was observed by SEM.Zn-Sb film comprises of nanoparticles,the size is uniform and the typical dimension is about 50 nm.The favorable prospect of the acetamide-urea-NaBr-KBr melt used as the electrolytic medium depositing nano-semiconductor alloys can be expected.