Fuente: University of Pittsburgh News
Expuesto el: martes, 21 de febrero de 2012 19:00
Autor: mbury
Asunto: Pitt Researchers Coax Gold Into Nanowires
| Discovery is designed to allow inexpensive detection of poisonous industrial gases by workers wearing small sensor chips filled with gold nanowires PITTSBURGH—Researchers at the University of Pittsburgh have coaxed gold into nanowires as a way of creating an inexpensive material for detecting poisonous gases found in natural gas. Along with colleagues at the National Energy Technology Laboratory (NETL), Alexander Star, associate professor of chemistry in Pitt's Kenneth P. High-Res Images High-res Image Caption: Figure 1. Synthesis and characterization of gold nanowires. (a) An aqueous suspension of 1-pyrenesulfonic acid (PSA)-functionalized single-walled carbon nanotubes (SWNTs) was used as a template during citrate reduction of HAuCl4. (b) TEM images showing the assembly of AuNPs on the SWNTs (after 30 min, left) and their welding into AuNWs (after 120 min, right). (c) UV–vis–NIR absorption spectra of AuNW-SWNTs and AuNP-SWNTs samples. Gold surface plasmon resonance shows a red shift with increasing size of gold nanostructures. The inset depicts a digital photo of vials containing suspensions of AuNPs and AuNWs (with SWNTs). (d) X-ray diffraction pattern of AuNWs. (e) High-resolution TEM image of AuNWs showing the polycrystalline nature of the welded AuNWs. |
