Advances in Molecular Electronics: a brief Review

Table 1: 
Band position and functional groups (with mode of vibration) of 
synthesized sample containing ETO-NPs.
 
Observed 
Band 
Position 
(cm)-1 
Functional groups and mode of vibration 
3424 
O-H Stretching or bending vibration of water molecule
(strong) 
2976 
CH3 asymmetric stretching 
1647 
C=N stretching (Amide group) or helical structure of 
NH2 due to urea compound 
1593 
CO stretching 
1459 
CH2\ CH3 bending or N=O symmetrical deformation 
1311 
C-O stretching of urea compound 
563 
Er-O-Er indicating the existence of ETO-NPs 
471 
Er-O indicating the existence of ETO-NPs 
UV-Visible Spectrum Analysis 
UV-Vis spectroscopy provides the stability as well as bandgap of 
the ETO-NPs. The UV-Vis of ETO-NPs is presented in (Figure 
5a,5b). Since ETO-NPs have been optical absorption which 
allows them to interact with particular wavelengths of UV-Vis 
radiations. It was found in the wavelength vs. absorbance plot 
(Figure 5a), the cut of the wavelength of the synthesized ETO-
NPs lies around 360 nm, and similarly, the bandgap energy of 
synthesized ETO-NPs was observed at 4.4 eV in (Figure 5b). 
Figure 5a:
 UV-Vis spectrum of ETO-NPs. 
Figure 5b:
 Photon energy vs. 
 spectrum of ETO-NPs. 
PL 
Photoluminescence 
(
PL) spectrum at ambient room temperature 
was executed to very much the optical absorption of ETO-NPs. PL 
spectrum (Figure 6) of ETO-NPs confirms the emission of UV 
radiation at 383.8 nm (3.23 eV) and the excitation band of the red 
region of light at 683.2 nm (1.81 eV). In general, the oxygen 
vacancies (defects in the synthesized sample containing ETO-
NPs) cause the broader peak at larger wavelengths in the PL 
spectrum. Therefore PL spectrum (Figure 6) reveals the existence 
of defects in the sample containing ETO-NPs.