Polymorph-Tuned Synthesis of [alpha]- and [beta]-Bi2O3 Nanowires and Determination of Their Growth Direction from Polarized Raman Single Nanowire Microscopy

• Published in: Chemistry : a European journal Vol. 17; no. 4; p. 1304
• Main Authors: In, Juneho, Yoon, Ilsun, Seo, Kwanyong, Park, Jeunghee, Choo, Jaebum, Lee, Yonghoon, Kim, Bongsoo
• Format: Journal Article
• Language: English
• Published: Weinheim Wiley Subscription Services, Inc 24-01-2011
• Subjects: Chemistry
• ISSN: 0947-6539; 1521-3765
• DOI: 10.1002/chem.201001684

We report polymorph-tuned synthesis of [alpha]- and [beta]-Bi2O3 nanowires and their single nanowire micro-Raman study. The single crystalline Bi2O3 nanowires in different phases ([alpha] and [beta]) 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, [alpha]- and [beta]- phase Bi2O3 nanowires were simultaneously synthesized along the temperature gradient at a substrate. The growth direction of [alpha]-Bi2O3 nanowires was revealed by polarized Raman single nanowire spectra. For thin [beta]-Bi2O3 nanowires with a very small diameter, the polarized Raman single nanowire spectrum was strongly influenced by the shape effect.