CdHgTe纳米晶/聚乙烯醇近红外纳米纤维的制备

Preparation of CdHgTe Nanocrystal and Poly(vinyl alcohol) Nanofibers with Near Infrared Emission

采用一步法制备了性质稳定的CdHgTe纳米晶，将其与聚乙烯醇水溶液共混，通过静电纺丝方法获得了CdHgTe纳米晶／聚乙烯醇纳米纤维．改变聚乙烯醇水溶液的浓度可以使纤维的直径在200—400nm范围内可调．所制备的纳米纤维在近红外区域具有很强的荧光，而且发光峰位与原水相纳米晶的峰位基本一致，这是采用其它方法制备纳米晶与聚合物的复合材料难以实现的．通过与聚乙烯醇的复合，纳米晶的热稳定性得到进一步增强，在120℃下将纳米纤维加热2h，其形貌和发光性质都未发生明显的变化．

Stable CdHgTe nanocrystals （NCs） were prepared via one-step in water. The nanofibers of CdHgTe NCs and poly（vinyl alcohol） （PVA） were obtained from electrospinning the mixing solution of CdHgTe NC and PVA. The diameter of the nanofibers were tuned from 200-400 nm by varying the mass fraction（4%- 12% ） of PVA solution. The best morphology of the nanofiber was got in the mass fraction range from 8%-10%. The nanofibers had strong photoluminescence in the range of near infrared （NIR） wavelength. Above all, they maintained the original peak position of the NCs in water, which was very difficult for the NC and polymer composites prepared using other methods. Moreover, the stabiiity of the NCs was further improved. They showed a thermal stability at the temperature of 120 ℃, which was much higher than that（80 ℃ of in water.