He Zhubing, Yu Shu-Hong
Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at Microscale, Structural Research Laboratory of CAS, School of Chemistry & Materials, University of Science and Technology of China, Hefei 230026, PR China.
J Phys Chem B. 2005 Dec 8;109(48):22740-5. doi: 10.1021/jp0544484.
Superlong single crystal tellurium nanoribbons with a width of 200-300 nm and length up to several hundred micrometers have been synthesized in tetraethylene pentamine aqueous solution at 80 degrees C. The stability of as prepared tellurium nanoribbons in solvents such as pure ethanol and deionized water has been studied. The poor crystallinity of the initial single crystalline Te nanoribbons with prolonged storing time demonstrated that the initial single crystalline nanobelts tend to be destroyed and to dissolve in the solvent. In meantime, the supersaturation of the solvable Te species in such solvents will result in the formation of amorphous Te, and the formation of amorphous TeO2 due to partial oxidation of the Te nanostructures and the newly formed amorphous Te. The detailed corrosion process, crystallinity, and shape evolution process have been carefully examined by the XRD, TEM, HRTEM, and XPS techniques. This erosion phenomenon attacked by solvents has been not identified previously, suggesting that tellurium nanoribbons synthesized by other chemical methods could be also not stable in solution system and their storage after laboratory synthesis requires special attention.
已在80摄氏度的四乙烯五胺水溶液中合成出宽度为200 - 300纳米、长度达数百微米的超长单晶碲纳米带。研究了所制备的碲纳米带在纯乙醇和去离子水等溶剂中的稳定性。初始单晶碲纳米带随着储存时间延长结晶度变差，这表明初始单晶纳米带易于被破坏并溶解在溶剂中。同时，可溶碲物种在这类溶剂中的过饱和会导致非晶态碲的形成，以及由于碲纳米结构和新形成的非晶态碲的部分氧化而形成非晶态二氧化碲。通过XRD、TEM、HRTEM和XPS技术仔细研究了详细的腐蚀过程、结晶度和形状演变过程。此前尚未发现这种受溶剂侵蚀的现象，这表明通过其他化学方法合成的碲纳米带在溶液体系中可能也不稳定，其在实验室合成后的储存需要特别注意。
