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CHARACTERIZATION OF PbS/MALEIC ANHYDRIDE-OCTENE-1           

NANOCOMPOSITES PRODUCED BY CHEMICAL IN-SITU METHOD 

 

Zamin MƏMİYEV,  Narmina BALAYEVA 

Institute of Physics, Azerbaijan National Academy of Sciences 

Baku State University 

[e-mail] 

 

Lead sulfide (PbS) as a unique semiconductor material has been intensively studied in the past decade. PbS 

nanocrystals are in interest because of the large exciton Bohr radius (18nm) that gives strong quantum confinement 

of electrons and holes, the well-developed synthetic protocols and properties such as multiple carrier generation. PbS is an 

important binary IV–VI semiconductor material with rather small band gap (0.41eV at 300K). Lead sulphide (PbS) 

nanoparticles have been used in photodetectors, photovoltaics and many other electronic and optoelectronic devices 

depending on the adjustable band gap and size. This paper described the conventional chemical co-precipitation method that 

employed for  preparation of PbS nanoparticles in the copolymer matrix. At the  present work for preparation of PbS 

nanocomposites with the maleic anhydride-octene-1  copolymer we used these chemicals lead-nitrate Pb(NO3)2, thiouera, 

DMFA and the copolymer. The copolymer was synthesed in the laborotory from the relevant monomers with polimerisation 

reaction. For this purpose, in accordance 100 g maleic anhydride and 10 ml Octene-1 monomers   were solved in diocsane 

in ampula.After the solution was heated at 80 0C temperature duiring 4 hours . In this case increasing the viscosity of the 

solution and at the resulting solid solution formed. In the second part of the proses the white color powder copolymer have 

been solved in DMFA in the three mouth flask so prepared 1% solution and then  metal solts  added to the flask. Therefore 

the solution  heated till 90 0C  in water bath for 4 hours by mixing and after 4 hours  thiouera  were added rapidly to the 

flask whith syringe. The reaction was continued for an other hour. At the end of reaction strong white clear solution turn to 

black color which indicated the formation of PbS nanoparticles. The final products were drying at 40◦C for 72 h by using 

PH-070A vacuum furnace drying incubator and then thin films and powder prepared. The obtained PbS/MA octene-1 

nanocomposites samples were characterized via X-ray diffraction method by using D8 Advance powder diffractometer 

under CuK

 irradiation  (λ = 1.54060 A°) after grinding to powder. Observed reflections at 2θ equal to 26.20, 290, 42.80, 

50.50, 52.70 were attributed to the miller index of the reflecting planes for 

1 1 1, 2 0 0, 2 2 0, 3 1 1 and 2 2 2. Have 

been determined that all the diffraction peaks in the spectrum are analogous to the literature pattern of face-centered cubic 

phase of PbS. Also the broadened peaks were indicated that the grain sizes of the particles are in nanorange. In order to 

achieve more confirmative information about the size of PbS nanocrystalline the  Scherer formula have been employed and 

the avarage size was calculated about 10-15 nm rangers. The morfological characterisation of the nanocomposites have been 

studied by the Atomic Force Microscope(AFM). UV–visible absorption spectra were recorded for chemically synthesized 

PbS nanoparticles and the absorption onset of the nanocomposite material was observed at 420 nm. The optical absorption 

coefficient has been calculated in the wavelength region of 400-650 nm and the band gap walue have been calculated 0,95 

eV for the nanoparticles. Also the optical properties of MA/octene-1 copolymer capped PbS nanoparticles were 

characterized by PL measurements at the room temperature. 

 

 

 

 

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