Original Articles |
|
|
|
|
Electronic Transport in Molecular Junction Based on C20 Cages |
OUYANG Fang-Ping; XU Hui |
School of Physics Science and Technology, Central South University, Changsha 410083School of Material Science and Engineering, Central South University, Changsha 410083 |
|
Cite this article: |
OUYANG Fang-Ping, XU Hui 2007 Chin. Phys. Lett. 24 1042-1045 |
|
|
Abstract Choosing closed-ended armchair (5, 5) single-wall carbon nanotubes (CCNTs) as electrodes, we investigate the electron transport properties across an all-carbon molecular junction consisting of C20 molecules suspended between two semi-infinite carbon nanotubes. It is shown that the conductances are quite sensitive to the number of C20 molecules between electrodes for both configuration CF1 and double-bonded models: the conductances of C20 dimers are markedly smaller than those of monomers. The physics is that incident electrons easily pass the C20 molecules and are predominantly scattered at the C20--C20 junctions. Moreover, we study the doping effect of such molecular junction by doping nitrogen atoms substitutionally. The bonding property of the molecular junction with configuration CF1 has been analysed by calculating the Mulliken atomic charges. Our results have revealed that the C atoms in N-doped junctions are more ionic than those in pure-carbon ones, leading to the fact that N-doped junctions have relatively large conductance.
|
Keywords:
72.10.-d
72.80.-r
85.65.+h
|
|
Received: 21 November 2006
Published: 26 March 2007
|
|
PACS: |
72.10.-d
|
(Theory of electronic transport; scattering mechanisms)
|
|
72.80.-r
|
(Conductivity of specific materials)
|
|
85.65.+h
|
(Molecular electronic devices)
|
|
|
|
|
[1] Aviram A and Ratner M A 1974 Chem. Phys. Lett. 29 277 [2] Joachim C, Gimzewski J K and Aviram A 2000 Nature 408541 [3] Smit R H M, Noat Y, Untiedt C, Lang N D, van Hemert M C and vanRuitenbeek J M 2002 Nature 419 906 [4] Montgomery M J, Hoekstra J, Todorov T N and Sutton A P 2003 J. Phys. Condens. Matter 15 731 [5] Chen Y C, Zwolak M and Ventra M Di 2003 Nano Lett. 3 1691 [6] Zeng D, Wang H, Wang B and Hou J G 2000 Appl.Phys. Lett. 77 3595 [7] Park H k, Park J, Lim K L, Anderson E H, Alivisatos A P and McEuenP L 2000 Nature 407 57 [8] Pasupathy A N,Park J, Chang C, Soldatov A V, Lebedkin S,Bialczak R C, GroseJ E, L A K Donev, Sethna J P, Ralph D C and McEuen PL 2005 Nano Lett. 5 203 [9] Zhao J, Zeng C, Cheng X, K Wang, Wang G, Yang J, Hou J G and Zhu Q2005 Phys. Rev. Lett. 95 045502 [10] Taylor J, Guo H and Wang J Phys. Rev. B 2001 63121104(R) [11] Palacios J J, Per\'ez-Jim\'enez A J, Louis E and Verg\'es J A 2001 Nanotechnology 12 160 [12] Gutierrez R, Fagas G, Cuniberti G, Grossmann F, Schmidt R andRichter K 2002 Phys. Rev. B 65 113410 [13] Schrier J and Whaley K B 2006 J. Phys. Chem. A 110 5386 [14] Otani M, Ono T and Hirose K 2004 Phys. Rev. B 69121408(R) [15] Yamamoto T, Watanabe K and Watanabe S 2005 Phys. Rev. Lett. 95 065501 [16] Prinzbach H, Andrey D, Mattias H and Nicolai S H 2000 Nature 407 60 [17] Miyamoto Y and Saito M 2001 Phys. Rev. B 63 161401(R) [18] Roland C, Larade B, Taylor J and Guo H 2001 Phys. Rev. B 65 041401(R) [19] Otani M, Ono T and Hirose K 2004 Phys. Rev. B 69121408(R) [20] Yamamoto T, Watanabe K and Watanabe S 2005 Phys. Rev. Lett. 95 065501 [21] Dagata J A, Perez-Murano F, Martin C, Kuramochi H and Yokoyama H2004 J. Appl. Phys. 96 2386 Martinez J, Yuzvinsky T D, Fennimore A M, Zettl A, Garcia R andBustamante C 2005 Nanotechnology 16 2493 [22] Watanabe H, Manabe C, Shigematsu T and Shimizu M 2001 App.Phys. Lett. 78 2928 Huang J Y, Chen S, Jo S H, Wang Z, Han D X, Chen G, Dresselhaus M S andRen Z F 2005 Phys. Rev. Lett. 94 236802 [23] Paulson S, Helser A, Nardelli M B, Taylor R M, Falvo M,Superfine R and Washburn S 2000 Science 290 1742 [24] Rueckes T, Kim K, Joselevich E, Tseng G Y, Cheung C L and LieberC M 2000 Science 289 94 Postma H W C, Teepen T, Yao Z, Grifoni M and Dekke C 2001 Science 293 76 [25] Yan Q M, Wu J, Duan W H and Gu B L 2005 Phys. Rev. B 72 155425 [26] Yan Q , Zhou G, Hao S G, Wu J and Duan W H 2006 Appl. Phys.Lett. 88 173107 [27] Ordejon P, Artacho E and Soler J M 1996 Phys. Rev. B 53R10441 Soler J M, Slava V R and Umberto R 2002 J. Phys.: Condens.Matter 14 2745 [28] Wang G W, Komatsu K, Murata Y and Shiro M 1997 Nature 387 583 |
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|