  Coalescence (or Growth) of tiny particles to larger particles has been an
exciting and practical research topic in nanotechnology. This study deals with
development of gold particles at varying precursor concentration in a
custom-built setup. Under the tuned ratio of bipolar pulse OFF to ON time, tiny
particles of different sizes and shapes develop depending on the amount of gold
precursor. When compact monolayer assembly is formed on solution surface, nano
energy in packet shapes bind gold atoms in own shape. Between 0.07 mM to 0.90
mM precursor concentration, tiny particles develop in both triangular and
non-triangular shapes. Tiny particles of triangular shape develop in a large
number at precursor concentration 0.30 mM and 0.60 mM. Hence, nanoparticles and
particles also developed in different geometrical shapes. Such tiny particles
pack due to the exerted force in immersing format, where made structures of
smooth elements assemble to develop nanoparticles and particles of different
shapes. Tiny particles of non-geometrical shapes do not assemble at a common
point and their assembling develops a nanoparticle or particle of distorted or
spherical shape. This occurs mainly when precursor concentration is 0.05 mM and
1.20 mM. At 50 sccm Argon flow rate, nanoparticles and particles develop in the
same shapes as in case of 100 sccm. For different precursor concentrations,
different colors of solutions indicate different features of nanoparticles and
particles. This study clarifies the necessary concentration of precursor to
develop colloids of different sizes.
