Abstract
Nanocrystals of lead sulfide were grown in TiO2 (titania) thin films prepared by a sol-gel process. The synthetic procedure as well as the structural, optical, and electrical properties of the films are demonstrated. The structures and morphology of PbS nanocrystals were analyzed using HRTEM, SAED, AFM, HRSEM, XRD and EDAX elemental analysis technique. When the concentration of PbS in the titania matrix is 20 mol%, PbS NCs with a diameter of 2.0 nm are created. At a higher PbS concentration (> 40 mole%) in the titania matrix, PbS NCs and PbS clusters are created not only within the TiO2 film but also on the external surface of the TiO2 film. By increasing the PbS concentration up to 50 mol%, PbS nanocrystals of 6–8 nm in diameter are formed within the titania film and PbS clusters with a base size of about 100 nm2 and a height up to about 20 nm were self assembled on the external surface of TiO2 film. Quantum size effect and band gap energies were obtained from shifts of the absorption edge. For electrical measurements, PbS–TiO2 films were deposited on an ITO/glass substrate, and then covered with gold contact. The electrical properties of ITO/PbS NCs–TiO2/Au and ITO/PbS NCs–TiO2/PbS cluster/Au structures were studied. I–V characteristics of the one layer structure are nearly linear and symmetric, while those of the two-layer structure exhibit rectifying behavior.
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References
Alivisatos AP (1996) Science 277:933 and references therein
Reisfeld R (1996) In: Reisfeld R, Jorgensen CK (eds) Structure and bonding, vol 85. Springer-Verlag, p 99
Schmid G (2004) Nanoparticles. From theory to application. Wiley-VCH, Essen
Martucci A, Fick J, lanc SL, Cascio ML, Hache A (2004) J Non-Crys Solid 345&346:639
Sundar C, Eisler H, Bawendi MC (2002) Adv Mater 14(10):739
Selvan ST, Bullen C, Ashokkumar M, Mulvaney P (2001) Adv Mater 13:985
Saraidarov T, Reisfeld R, Sashchiuk A, Lifshitz E (2004) J Non-Crys Solid 345&346:698
Capoen B, Martucci A, Turrell S, Bouaraoui M (2003) J Mol Struct 651–653:467
Martucci A, Fick J, Schell J, Battaglin G, Guglielmi M (1999) J Appl Phys 86:79
Guerreiro PT, Ten S, Borrelli NF, Butty J, Jabbour GE, Peyghambarian N (1997) Appl Phys Lett 71:1595
Martucci A, Innocenzi P, Fick J, Mackenzie JD (2002) J Non-Crys Solid 244:55
Sashchiuk A, Lifshitz E, Reisfeld R, Saraidarov T, Zelner M, Willenz A (2002) J Sol–Gel Sci Tech 24:31
Saraidarov T, Reisfeld R, Sashchiuk A, Lifshitz E (2003) J Sol–Gel Sci Technol 26:533
Kitiyanan A, Yoshikawa S (2005) Mater Lett 59:29, 4038
Hwan Ryu D, Chul Kim S, Man Koo S (2003) J Sol–Gel Sci Technol 26:489
Paez LR, Matousek J (2004) Ceramics-Silikaty 48(2):66
Costa VC, Lameiras FS, Terezinha M, Sansviero C, Simões AB, Vasconcelos WL (2004) J Non-Crys Solid 348:190
Kang K, Daneshvar K, Tsu R (2004) Microelect J 35:629
Plass R, Pelet S, Krueger J, Gra1tzel M, Bach U (2002) J Phys Chem B 106:7578
Saraidarov T, Reisfeld R, Sashchiuk A, Lifshitz E (2005) J Sol–Gel Sci Technol 34:137
Pavasupree S, Suzuki Y, Pivsa-Art S, Yoshikawa S (2005) Sci Technol Adv Mater 6(3–4):224
Wark M, Tschirch J, Bartels O, Bahnemann D, Rathousky J (2005) Micropor Mesopor Mater 84:247
Liu B, Cao Y, Chen D, Kong J, Deng J (2003) AnalChimica Acta 478:59
Reisfeld R, Saraidarov T, Jasinska B (2004) Optic Mater 26:181
Boudine B, Sebais M, Halimi O, Mouras R, Boudrioua A, Boursion P (2004) Opt Mater 25:373
Furrer G, Phillips BL, Uldrich KU, Pothig R, Casey WH (2002) Science 297:2243
Wang Y, Suna A, Mahler W, Krasnovsku R (1987) J Chem Phys 67:7315
Kumar S, Sharma TP, Zulfequar M, Husain M (2003) Physica B 325:8
Ben-Chorin M, Muller F, Koch F (1995) J Appl Phys 77:4482
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Saraidarov, T., Gevorgian, A., Reisfeld, R. et al. Synthesis, structural and electrical characterization of PbS NCs in titania sol–gel films. J Sol-Gel Sci Technol 44, 87–95 (2007). https://doi.org/10.1007/s10971-007-1617-8
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DOI: https://doi.org/10.1007/s10971-007-1617-8