Synthesis and optical properties of CdSe/CdS core/shell nanocrystals

Open access

Abstract

This paper attempts to describe an effective method for producing a composite of quantum dots consisting of CdSe (core) with CdS (shell). This nanoparticles composite was synthesized from modified organometallic precursors. The sizes of the nanoparticles were estimated from X-ray diffraction data using Debye-Scherer formula and compared with high resolution electron microscopy (HRTEM) and optical spectra. The shape of CdSe/CdS NPs is nearly spherical and revels that the CdS shell with the thickness ~0.6 nm almost fully covers the CdSe core (higher contrast). Using UV-Vis spectroscopy, a systematic red shift in the absorption and emission spectra was observed after the deposition of CdS which confirms the shell growth over the CdSe core. In the CdSe/CdS core/shell structure, the holes are confined to the core, while the electrons are delocalized as a result of similar electron affinities of the core and the shell. The increased time of synthesis resulted in shell thickness increase. The observed properties of prepared CdSe/CdS QDs demonstrate the capability of the nanocomposite for using in the optoelectronics and photonics devices.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • [1] Steigerwald M.L. Polyhedron 8 (1994) 1245.

  • [2] Mansur H.S. Wiley Interdiscip. Rev. Nanomed. Nanobiotechnol. 2 (2010) 113.

  • [3] Park J. Lee K.H. Galloway J.F. Searson P.C. J. Phys. Chem. 46 (2008) 17849.

  • [4] Eychmüller A. Rogach A.L. Pure Appl. Chem. 1 – 2 (2000) 179.

  • [5] Murry C.B. Norris D.J. Bawendi M.G. J. Am. Chem. Soc. 19 (1993) 8706.

  • [6] Embden J.V. Jasieniak J. Gomez D.E. Mulvaney P. Giersig M. Aust. J. Chem. 7 (2007) 458.

  • [7] Harrison M.T. Kershaw S.V. Burt M.G. Eychmuller A. Weller H. Rogach A.L. Mater. Sci. Eng. B-Adv. 69 (2000) 355.

  • [8] Sharm N. Vats T. Dhenadhayalan N. Ramamurthy P. Narula A.K. Sol. Energ. Mater. Sol. C. 100 (2012) 6.

  • [9] Neeleshwar S. Chen C.L. Tasi C.B. Chenmy. Y. Phys. Rev. B 20 (2005) 201307(R).

  • [10] Liaw Y.F. Li W.J. J. Zhejiang Uni. Sci. A 9 (2007) 133.

  • [11] Sun M. Yu H. Yang W. Qi L. Yang F. Yang X. Colloids Surf. A Physicochem. Eng. Asp. 1 – 3 (2009) 91.

  • [12] Yang D. Chen Q. Xu S. J. Lumin. 2 (2007) 853.

  • [13] Talapin D.V. Rogach A.L. Kormowski A. Haase M. Weller H. Nano Lett. 4 (2001) 207.

  • [14] Tian Y. Newton T. Kotov N.A. Guldi D.M. Fendler J. J. Chem. Phys. 21 (1996) 8927.

  • [15] Youn H.C. Baral S. Fendler J.H. J. Phys. Chem. 22 (1988) 6320.

  • [16] Kortan A.R. Hull R. Opila R.L. Bawendi M.G. Steigerwald M.L. Carroll P.J. Brus L.E. J. Am. Chem. Soc. 4 (1990) 1327.

  • [17] Mews A. Eychmuller A. Giersig M. Schooss D. Weller H. J. Phys. Chem. 3 (1994) 934.

  • [18] Hines M.A. Guyot-Sionnest P. J. Phys. Chem. 2 (1996) 468.

  • [19] Klimov V.I. Nanocrystal quantum dots Taylor & Francis Group New York 2010.

  • [20] Ledentsov N.N. Semicond. News 2 (2001) 22.

  • [21] Klimov V.I. Mikhailovsky A.A. Xu S. Malko A. Hollingsworth J.A. Leatherdale C.A. Eisler H. Bawendi M.G. Science 5490 (2000) 314.

  • [22] Schaller R.D. Petruska M.A. Klimov V.I. J. Phys. Chem. B 50 (2003) 13765.

  • [23] Htoon H. Hollingsworth J.A. Dickerson R. Klimov V.I. Phys. Rev. Lett. 22 (2003) 227401.

  • [24] Cao Y. Banin U. J. Am. Chem. Soc. 40 (2000) 9692.

  • [25] Lamer V.K. Dinegar R.H. J. Am. Chem. Soc. 11 (1950) 4847.

  • [26] KUMARAN S.M. GOPALAKRISHNAN R. J. Sol- Gel. Sci. Technol. 2 (2012) 193.

  • [27] Yu W.W. Qu L. Guo W. Peng X. Chem. Mater. 14 (2003) 2854.

  • [28] Liu S.M. Guo H.Q. Zhang Z.H. Li R. Chen W. Wang Z.G. Phys. E. 2 (2000) 174.

  • [29] Ethayaraja M. Ravikumar C. Muthukumaran D. Dutta K. Bandyopadhyaya R. J. Phys. Chem. 8 (2007) 3246.

  • [30] Nguyen H.Q. Adv. Nat. Sci. Nanosci. Nanotechnol. 2 (2010) 025004.

Search
Journal information
Impact Factor

IMPACT FACTOR 2018: 0.918
5-year IMPACT FACTOR: 0.916

CiteScore 2018: 1.01

SCImago Journal Rank (SJR) 2018: 0.275
Source Normalized Impact per Paper (SNIP) 2018: 0.561

Metrics
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 80 80 17
PDF Downloads 57 57 8