Laser ablation of tin oxide SnO2
nanoparticles NPs was carried out by irradiation of tin target with nanosecond
laser pulses in methanol and aqueous NaCl solutions. X-ray diffraction studies
show that the synthesized nanoparticles are crystalline tin oxide with rutile
phase. Scanning electron microscope SEM
and transmission electron microscope TEM were used for characterization of the
shape, particle size and optical properties of ablated tin oxide nanoparticles.
SEM results reveal that the synthesized
NPs have spherical shape and the presence of agglomerated NPs was observed. The
TEM investigation confirms the average particle size of SnO2 synthesized
in methanol was 55 nm and in NaCl solution was 30 nm. The optical energy gap of SnO2 NPs
prepared a in methanol and NaCl solution were 3.8 eV and 3.95 eV, respectively.
Energy dispersive X-Ray EDX confirms formation of SnO2 NPs. The
parameters of SnO2NPs/n-Si heterojunction photodetectors, namely
current-voltage characteristics and spectral responsivity were measured