Monoclinictungstenoxidenanorodswithdiametersof50-150nmandlengthsof5-20毫米havebeen 生长directlyontoporoussiliconwithnocatalystbythermalevaporation.Theobtainedproducts 是investigatedbyscanningelectronmicroscopy，X光衍射，拉曼光谱学，能量 dispersivespectroscopy，andtrans