This document outlines a mini project to synthesize molybdenum diselenide nanoparticles via a hydrothermal synthesis process for use in sensor applications. The objectives are to optimize the hydrothermal synthesis of molybdenum diselenide nanoparticles and characterize the particles using techniques such as UV-Vis spectroscopy, XRD, SEM and TEM. The methodology describes the hydrothermal synthesis which involves preparing a reaction mixture and heating it in an autoclave at 200°C. Work done so far includes preparing the reaction mixture and constant stirring. Future work involves centrifugation, drying, and characterization of the nanoparticles.

1. MINI PROJECT - FIRST REVIEW
GIRIDHARANI R_203003014
SUPRIYA R S_203003054
SHAKTHI VEL B_203003304
PREPARATION OF MOLYBDENUM DISELENIDE
METAL OXIDE NANOPARTICLES FOR SENSOR
APPLICATION
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UBM1617 - MINI PROJECT

2. INTRODUCTION
• Metal oxide nanoparticles have emerged as a promising platform for
development of sensors that can detect and monitor a wide range of
applications spanning from environmental science to clinical diagnostics.
• Hydrothermal synthesis of Molybdenum diselenide allows precise control
over its size,morphology and quality of nanoparticles which are essential for
optimizing their physical and chemical properties. Additionally,composite
material of molybdenum diselenide with polymeric materials such as PVA can
be prepared to enhance their properties and potential applications in sensor
fabrication.
• In this project , we aim to synthesize high quality molybdenum diselenide that
can be combined along with PVA for sensor fabrication.
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3. AIM AND OBJECTIVES
AIM :
To prepare molybdenum diselenide metal oxide nanoparticles for sensor
application.
OBJECTIVES :
● To optimize the hydrothermal synthesis process for the preparation of
molybdenum diselenide nanoparticles.
● To characterize the synthesized metal oxide nanoparticle using various
analytical techniques such as UV Visible spectroscopy and X ray diffraction
(XRD)
● To study the physical properties of the synthesized molybdenum diselenide
nanoparticles by SEM & TEM.
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4. APPARATUS REQUIRED
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ANALYTICAL BALANCE MAGNETIC STIRRER FURNACE
AUTOCLAVE WITH TEFLON LINER

5. APPARATUS REQUIRED
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BEAKER SPATULA
CENTRIFUGE MACHINE

6. CHEMICALS REQUIRED
• Sodium molybdate dihydrate (≥98%),
• selenium powder (99.9%),
• sodium borohydride (99%), and
WEIGHT (in grams)
• Sodium molybdate dihydrate (≥98%) - 0.0658 g
• selenium powder (99.9%) - 0.0618 g
• sodium borohydride (99%) - 0.0102 g
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7. METHODOLOGY : HYDROTHERMAL SYNTHESIS
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8. METHODOLOGY : HYDROTHERMAL SYNTHESIS
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9. WORK DONE
1. Preparation of the reaction mixture using sodium molybate
dihydrate , selenium powder and sodium borohydride, distilled
water and ethanol
2. Constant stirring of the prepared mixture at 500 rpm.
3. Heating the autoclave at 200 °C in a furnace.
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10. WORK TO BE DONE
1. Centrifugation of the resultant mixture kept in the furnace.
2. Drying the material obtained after centrifugation in a hot air
oven.
3. The following characterization studies are to be made.
• UV Visible spectroscopy
• X ray diffraction (XRD)
• SEM
• TEM
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11. RESULTS
●During the heating process, sodium borohydride reacts with water
to produce hydrogen gas and sodium hydroxide.
●The sodium hydroxide further reacts with the mixture of
precursors to form molybdenum diselenide.
●The furnace provides a controlled environment that allows the
reaction to occur at high temperatures and pressures
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12. REFERENCES
1. https://www.researchgate.net/publication/282485379_Hydrothermal_synthesis_a
nd_tribological_properties_of_MoSe2_nanoflowers
1. https://aip.scitation.org/doi/10.1063/1.5032703
1. https://www.sciencedirect.com/science/article/pii/S0021979718309056
1. https://pubs.acs.org/doi/10.1021/acsomega.8b00459
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