Department of Chemistry, KAIST, Daejeon, Korea.
Chemistry. 2011 Jan 24;17(4):1304-9. doi: 10.1002/chem.201001684. Epub 2010 Nov 30.
We report polymorph-tuned synthesis of α- and β-Bi(2)O(3) nanowires and their single nanowire micro-Raman study. The single crystalline Bi(2)O(3) nanowires in different phases (α and β) were selectively synthesized by adjusting the heating temperature of Bi precursor in a vapor transport process. No catalyst was employed. Furthermore, at an identical precursor evaporation temperature, α- and β- phase Bi(2)O(3) nanowires were simultaneously synthesized along the temperature gradient at a substrate. The growth direction of α-Bi(2)O(3) nanowires was revealed by polarized Raman single nanowire spectra. For thin β-Bi(2)O(3) nanowires with a very small diameter, the polarized Raman single nanowire spectrum was strongly influenced by the shape effect.
我们报告了 α- 和 β-Bi(2)O(3) 纳米线的多晶调谐合成及其单纳米线微拉曼研究。通过在蒸汽传输过程中调节 Bi 前体的加热温度，选择性地合成了不同相（α 和 β）的单晶 Bi(2)O(3)纳米线。没有使用催化剂。此外，在相同的前体蒸发温度下，α-和 β-相 Bi(2)O(3)纳米线沿基底的温度梯度同时合成。通过偏振拉曼单纳米线光谱揭示了 α-Bi(2)O(3)纳米线的生长方向。对于具有非常小直径的薄 β-Bi(2)O(3)纳米线，偏振拉曼单纳米线光谱强烈受到形状效应的影响。
