IJAPM 2014 Vol.4(4): 263-266 ISSN: 2010-362X
DOI: 10.7763/IJAPM.2014.V4.296
DOI: 10.7763/IJAPM.2014.V4.296
Synthesis and Characterization of Silver Sulphide Quantum Dots by UV-AVA Spectroscopy
Ekpekpo Arthur and Chukwuka D. Doris
Abstract—This results of the experimental investigation of
the synthesis and characterization of Silver Sulphide Quantum
Dots is presented. In this work, silver quantum dots were
synthesized using the Successive Ionic Layer Adsorption and
Reaction (SILAR) technique. Different numbers of SILAR
circles, ranging from four to ten circles of Silver Quantum Dots
were synthesized. Tin II Chloride was used as the reducing
agent which reduces silver hydroxide to silver. A colourless
substrate immersed in the container of Tin II chloride solution
before its immersion in the container of silver nitrate solution
was observed to be brown which increases with the number of
SILAR cycles as a result of the formation of silver quantum dots
on it. The number of cycles directly determines the size of the
quantum dots produced. Exposure of these substrates with
silver quantum dots to hydrogen sulphide for 10minutes in a
fume chamber using the Kipp’s apparatus converted the silver
quantum dots to silver sulphide quantum dots thereby making
the substrates to become dark brown. The synthesized
Quantum Dots were characterized using UV-SPEC2048
Spectroscopy machine. The absorption spectra exhibit a blue
shift with decreasing size of silver sulphide quantum dots. This
is due to the quantum size effect. The band gap of silver
sulphide quantum dots with their respective sizes was
calculated and it was found that the average band gap of the
synthesized silver sulphide quantum dot is 1.80eV. This is
higher than the band gap of bulk silver sulphide semiconductor
which is about 0.9eV.
Index Terms—Quantum dots, silver sulphide, nanoparticles.
The authors are with the Department of Physics, Delta State University, Abraka (e-mail: arthurekpekpo@yahoo.com).
Index Terms—Quantum dots, silver sulphide, nanoparticles.
The authors are with the Department of Physics, Delta State University, Abraka (e-mail: arthurekpekpo@yahoo.com).
Cite: Ekpekpo Arthur and Chukwuka D. Doris, "Synthesis and Characterization of Silver Sulphide Quantum Dots by UV-AVA Spectroscopy," International Journal of Applied Physics and Mathematics vol. 4, no. 4, pp. 263-266, 2014.
General Information
ISSN: 2010-362X (Online)
Abbreviated Title: Int. J. Appl. Phys. Math.
Frequency: Quarterly
APC: 500USD
DOI: 10.17706/IJAPM
Editor-in-Chief: Prof. Haydar Akca
Abstracting/ Indexing: INSPEC(IET), CNKI, Google Scholar, EBSCO, Chemical Abstracts Services (CAS), etc.
E-mail: ijapm@iap.org
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