STM Spectroscopy of Alloyed Nanocrystal Composite CdSxSe1-X
Nanocrystals (NC) alloyed composite CdSxSe1-x(x=0
to 1) have been prepared using the chemical solution deposition
technique. The energy band gap of these alloyed nanocrystals of
approximately the same size, have been determined by scanning
tunneling spectroscopy (STS) technique at room temperature. The
values of the energy band gap obtained directly using STS are
compared to those measured by optical spectroscopy. Increasing the
molar fraction ratio x from 0 to 1 causes clearly observed increase in
the band gap of the alloyed composite nanocrystal. Vegard-s law was
applied to calculate the parameters of the effective mass
approximation (EMA) model and the dimension obtained were
compared to the values measured by STM. The good agreement of
the calculated and measured values is a direct result of applying
Vegard's law in the nanocomposites.
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[1] M. Bruchez, M. Moronne, P. Gin, S. Weiss, A.P. Alivisatos, Science
281(1998) 2013.
[2] W.C.W. Chan, S.M. Nie, Science 281 (1998) 2016.
[3] Y. Yin, A.P. Alivisatos, Nature 437 (2005) 664.
[4] E.A. Weiss, R.C. Chiechi, S.M. Geyer, V.J. Porter, D.C. Bell, M.G.
Bawendi, G.M. Whitesides, J.Am. Chem. Soc. 130 (2008) 74.
[5] Q. Zhao, P.A. Graf, W.B. Jones, A. Franceschetti, J. Li, L.W. Wang, K.
Kim, Nano Lett. 7 (2007) 3274.
[6] V.I. Klimov, Annu. Rev. Phys. Chem. 58 (2007) 635.
[7] S.C. Erwin, L.J. Zu, M.I. Hafter, A.L. Efros, T.A. Kennedy, D.J. Norris,
Nature 436 (2005) 91.
[8] X. Chen, J. Hutchison, P.J. Dobson, G. Wakefield, J. Mater. Sci. 44
(2009) 285.
[9] Y. Wang, Z.Y. Tang, M.A. Correa-Duarte, I. Pastoriza-Santos, M.
Giersig, N.A. Kotov, L.M. Liz-Marzan, J. Phys. Chem. B 108 (2004)
15461.
[10] D.V. Talapin, A.L. Rogach, A. Kornowski, M. Haase, H. Weller, Nano
Lett.1 (2001) 207.
[11] R.E. Bailey, S.M. Nie, J. Am. Chem. Soc. 125 (2003) 7100.
[12] E. Jang, S. Jun, L. Pu, Chem. Commun.24 (2003) 2964.
[13] X.H. Zhong, M.Y. Han, Z.L. Dong, T.J. White, W. Knoll, J. Am. Chem.
Soc. 125 (2003) 8589.
[14] X.H. Zhong, Y.Y. Feng, W. Knoll, M.Y. Han, J. Am. Chem. Soc. 125
(2003) 13559.
[15] Z.B. Pi, L.Y. Wang, X.K. Tian, C. Yang, J.H. Zheng, Mater. Lett. 61
(2007) 4857.
[16] L.A. Swafford, L.A. Weigand, M.J. Bowers, J.R. McBride, J.L.
Rapaport,T.L. Watt, S.K. Dixit, L.C. Feldman, S.J. Rosenthal, J. Am.
Chem. Soc. 128 (2006) 12299.
[17] Y. Wang, Y.B. Hou, A. Tang, B. Feng, Y. Li, J. Liu, F. Teng, J. Cryst.
Growth 308 (2007) 19.
[18] Y.G. Zheng, Z.C. Yang, J.Y. Ying, Adv. Mater. 19 (2007) 1475.
[19] Erik P.A.M. Bakkers, Daniel Vanmaekelbergh, Phys. Rev. B 62 (2000)
R7743.
[20] Al L. Efros, M. Rosen, Annu. Rev. Mater. Sci. 30 (2000) 475.
[21] L.V. Keldysh, JETP Lett. 29 (1979) 658; D.S. Chemla, D.A.B. Miller,
Opt.Lett. 11 (1986) 522.
[22] E.A. Muljarov et al., Phys. Rev. B 62 (2000) 7420.
[23] Vegard, L. Z. Phys. 5, (1921), 17.
[24] Swafford, L. A.; Weigand, L. A.; Bowers, M. J.; McBride, J. R.;
Rapaport, J. L.; Watt, T. L.; Dixit, S. K.; Feldman, L. C.; Rosenthal, S.
J. J. Am. Chem. Soc. 128, (2006), 12299.
[25] D.V. Talapin, A.L. Rogach, A. Kornowski et al., Nano Lett. 1, 207
(2001).
@article{"International Journal of Chemical, Materials and Biomolecular Sciences:54785", author = "T. Abdallah and K. Easawi and A. Khalid and S. Negm and H. Talaat", title = "STM Spectroscopy of Alloyed Nanocrystal Composite CdSxSe1-X", abstract = "Nanocrystals (NC) alloyed composite CdSxSe1-x(x=0
to 1) have been prepared using the chemical solution deposition
technique. The energy band gap of these alloyed nanocrystals of
approximately the same size, have been determined by scanning
tunneling spectroscopy (STS) technique at room temperature. The
values of the energy band gap obtained directly using STS are
compared to those measured by optical spectroscopy. Increasing the
molar fraction ratio x from 0 to 1 causes clearly observed increase in
the band gap of the alloyed composite nanocrystal. Vegard-s law was
applied to calculate the parameters of the effective mass
approximation (EMA) model and the dimension obtained were
compared to the values measured by STM. The good agreement of
the calculated and measured values is a direct result of applying
Vegard's law in the nanocomposites.", keywords = "Alloy semiconductor nanocrystals, STM.", volume = "6", number = "1", pages = "62-3", }