Đang chuẩn bị nút TẢI XUỐNG, xin hãy chờ
Tải xuống
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride | Stavarache et al. Nanoscale Research Letters 2011 6 88 http www.nanoscalereslett.eom content 6 1 88 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride 1 1 1 1 2 lonel Stavarache Ana-Maria Lepadatu Valentin Serban Teodorescu Magdalena Lidia Ciurea Vladimir lancu Mircea Dragoman3 George Konstantinidis4 Raluca Buiculescu5 Abstract The electrical behavior of multi-walled carbon nanotube network embedded in amorphous silicon nitride is studied by measuring the voltage and temperature dependences of the current. The microstructure of the network is investigated by cross-sectional transmission electron microscopy. The multi-walled carbon nanotube network has an uniform spatial extension in the silicon nitride matrix. The current-voltage and resistance-temperature characteristics are both linear proving the metallic behavior of the network. The I-V curves present oscillations that are further analyzed by computing the conductance-voltage characteristics. The conductance presents minima and maxima that appear at the same voltage for both bias polarities at both 20 and 298 K and that are not periodic. These oscillations are interpreted as due to percolation processes. The voltage percolation thresholds are identified with the conductance minima. Background The carbon nanotubes CNTs either single-walled SWCNTs or multi-walled MWCNTs have a quasi1D behavior that results from their nanometric diameters and micrometric lengths 1-6 . While the SWCNT structures correspond to the rolling up of one graphene sheet the MWCNTs consist of several concentric sheets. The electrical behavior of SWCNTs is determined by their chirality either metallic or semiconductor 7 . The longitudinal conductance of a metallic one is quantified namely G nG0 with G0 2e2 h 77.47 pS and n a natural number. The behavior of MWCNTs is metallic if at least one sheet has a metallic .
