TY  - JOUR
T1  - Structural, Morphological and Optical Properties of Metal Nanoparticles Assemblies of Gold
AU - Tahir, Sofia AU - Rizwan, Muhammad AU - Siraj, Saba 
JO  - Research Journal of Applied Sciences
VL  - 15
IS  - 7
SP  - 240
EP  - 248
PY  - 2020
DA  - 2001/08/19
SN  - 1815-932x
DO  - rjasci.2020.240.248
UR  - https://makhillpublications.co/view-article.php?doi=rjasci.2020.240.248
KW  - UV-visible spectrophotometer
KW  -surface plasmon resonance
KW  -Sodium borohydride
KW  -Gold nanoparticles
KW  -Field Emission Scanning Electron Microscope (FESEM)
KW  -Transmission Electron Microscope (TEM)
KW  -1
KW  -9- Nonanedithiol (NDT)
AB  - In this research work, gold nanoparticles were
synthesized by three different methods. These were, seed
growth method, citrate-reduction method and gold
nanoparticles prepared from sodium borohydride and
refluxed with sodium acrylate. These nanoparticles were
characterized using UV-visible spectrophotometer, TEM
and FESEM. In the seed growth method gold
nanoparticles were synthesized by four steps of seeding
growth with maximum plasmon bands at 524, 524, 530
and 539 nm as examined by UV-visible
spectrophotometer. The TEM micrograph showed that
gold nanoparticles obtained from first step of seeding
were spherical with 5-10 nm diameters. The second step
nanoparticles were spherical and triangular with diameter
of about 15-20 nm. Those obtained from third and
fourth step of seeding were spherical with17-20 nm and
50-60 nm size, respectively. As the size of gold
nanoparticles was increased from 5-60 nm, their SPR
band was also increased from 524-539 nm. The citratestabilizedna
noparticles were 15-17 nm in size with
maximum plasmon band at 521 nm. The UV-visible
spectra for the gold nanoparticles synthesized by
sodium borohydride in 1,9-NDT showed the appearance
of a second red-shifted plasmon resonance band at 950
nm wavelength. The intensity of this band was enhanced
with increase in 1,9-NDT concentration.
ER  -