Page 83 - Annual Report_21-22

The colour during dye degradation can be monitored has been used as a programming language to write the
using Colour Sensor. This sensor usually detects colour programs. The below figure represents the spectrum of
in RGB (red, green and blue) scale. The colour sensor has Eosin Yellowish obtained from the spectrograph and the
been designed using both hardware and software. Python predicted spectrum of Eosin Yellowish.

(a) (b) (c)
Fig 4. (a) The image of Eosin Yellowish, (b) the spectrum of Eosin Yellowish obtained from
spectrograph and (c) the predicted spectrum of Eosin Yellowish are presented

Synthesis of Mo-based Two-dimensional (2D) heterostructures for device applications (OLP-104)

Two-dimensional (2D) layered materials such as metal stoichiometric state with various hetero-interfaces
chalcogenides (MCs) have been studied extensively for and determine their exact atomic-scale structures to
optoelectronic applications due to their sizeable bandgap understand their structure-property correlation. Our long-
in the visible and near-infrared range, mechanical term goal is to fabricate various 2D metal chalcogenides
flexibility, strong light-matter interaction at monolayer material and their heterointerfaces on other 2D layered
thickness. Optoelectronic devices such as photodetectors, substrates using chemical vapour deposition (CVD) and
photovoltaics (PV) and light-emitting devices have been perform atomic-scale interfacial studies of multilayered
demonstrated using MCs of various device architectures structures to get the highly efficient and flexible module
and measurements. for device applications. The following work has been done.
Thus, it is essential to fabricate these materials at their
• Three independent temperature gradient zone chemical vapour deposition(CVD) equipment is successfully customized
and installed for the growth of various 2D materials.
• MoO 2d materials of various thicknesses are successfully synthesized using the CVD method. (as shown in figure 1).
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• The Structural study has been performed using the newly installed JEOL JEM-F200 TEM at IMMT.

Figure 1: (a) Optical microscopy (b) SEM image of CVD-grown 2D MoO flakes (c) selected area electron diffraction
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(SAED) of the flakes and (d) corresponding HRTEM image and crystal structure (inset) shows the presence of
α- MoO structures.
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ANNUAL REPORT 2021-22 81