Formation and UV-Vis Studies of Lead Sulfide Nanoparticles

Authors H. Yanuar1 , B. Iwantono1, A.V. Nabok2

1Department of Physics, Universitas Riau, 28132 Pekanbaru, Indonesia

2Materials and Engineering Research Institute, Sheffiled Hallam University, Sheffield S1 1WB, UK

Issue Volume 11, Year 2019, Number 2
Dates Received 22 December 2018; revised manuscript received 04 April 2019; published online15 April 2019
Citation H. Yanuar, B. Iwantono, A.V. Nabok, J. Nano- Electron. Phys. 11 No 2, 02029 (2019)
PACS Number(s) 78.67.Bf, 81.16.Rf
Keywords LB films, PbS-NPs, Quantum confinement (5) , Energy gap.

An elegant technique of synthesizing semiconductor lead sulfide nanoparticles (PbS-NPS) embedded in Langmuir-Blodgett (LB) films is presented here. Stearic acids have been used as a matrix to form and grow the quantum-sized PbS. Pure Y-type Pb-salts of stearic acid (SA) LB films were prepared at a dipping speed of 15 mm/min and surface pressure of 28 mN/m. PbS-NPs were formed inside LB films of SA by exposure the LB films to hydrogen sulfide (H2S) gas. The preparation of PbS-NPs is discussed in terms of particle formation and growth. The presence of PbS-NPs was investigated by UV-visible absorption. It was found that the PbS-NPs within SA LB films indicated a large blue shift of the optical absorption edge. The estimation of the size distribution performed by optical measurements allows one to attribute the particle range a few nanometers. This figure seems to depend upon the reaction conditions as well as the quality of the initial LB films.

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