General Method for Ultrathin Free-Standing Films of Nanofibrous Composite Materials

详细信息    查看全文

• 作者：Xinsheng Peng ; Jian Jin ; Emma M. Ericsson ; Izumi Ichinose
• 刊名：Journal of the American Chemical Society
• 出版年：2007
• 出版时间：July 11, 2007
• 年：2007
• 卷：129
• 期：27
• 页码：8625 - 8633
• 全文大小：1225K
• 年卷期：v.129,no.27(July 11, 2007)
• ISSN：1520-5126

文摘

A simple and general method for the preparation of ultrathin, large-area, free-standing films ofnanofibrous composite materials was developed. First, positively charged cadmium hydroxide nanostrandsof 1.9 nm in diameter and micrometers in length were prepared by mixing dilute aqueous solutions ofcadmium chloride and aminoethanol. Negatively charged dye molecules, proteins, nanoparticles, and water-soluble fullerene or carbon nanotubes were mixed with the nanostrands to give a well-dispersed solutionof the corresponding nanofibrous composites. After filtration of the dispersions with a polycarbonatemembrane filter, uniform films with a thickness of a few tens to hundreds of nanometers and a diameter ofa few centimeters were obtained. The films were readily peeled off from the membrane filter by immersionin ethanol. The resultant free-standing films could be further transferred to other substrates, such as quartzplate, gold electrode, and porous alumina membrane, and were characterized by scanning and transmissionelectron microscopies. We provide herein various nanofibrous free-standing films with optical, biological,metallic, and magnetic properties.