Synthesis of carbon nanostructures using microwave enhanced chemical vapor deposition and its potential application to ammonia sensing

Nicodemus Kure,Ibrahim Lakin,Isaac Daniel,Hamidon Niza,Zainab Yunusa

doi:10.47514/phyaccess.2021.1.1.0007

Abstract

In this paper, Carbon Nanostructures (CNS) were directly synthesized on gallium orthophosphate (GaPO4). An alternative microwave enhanced chemical vapor deposition (MECVD) technique was used to synthesized the CNS via commercial microwave oven with operating power of 600 W at 2.45 GHz. Microwave heating provides the temperature for catalytic decomposition of polyethylene at 750 °C for 4 minutes under atmosperic pressure of 0.81 mbar. Characterization of the as-grown CNS was carried out using Raman spectroscopy and Field Emission Scanning electron microscope (FESEM). Raman spectroscopic investigation reveals the CNS quality of 0.92 and the field emission Scanning electron microscope (FESEM) analysis shows twisted hollow-like CNS structures. The material was deployed as a sensor without any post treatment so as to investigate its potential application in the sensor industry. Different concentrations of ammonia (NH3) gas from 0.06% to 1% were exposed.

Highlights

Ammonia ( ) one of the most highly toxic gas, environmental pollutants and yet being utilized in many food processing, medical diagnosis and chemical industries.Any leak in these systems may cause health hazards [1, 2].detection of in trace amount is very crucial in terms of health and environmental sectors
Characterization of the as-grown Carbon Nanostructures (CNS) was carried out using Raman spectroscopy and Field Emission Scanning electron microscope (FESEM)
Raman spectroscopic investigation reveals the CNS quality of 0.92 and the field emission Scanning electron microscope (FESEM) analysis shows twisted hollow-like CNS structures

Summary

Introduction

Ammonia ( ) one of the most highly toxic gas, environmental pollutants and yet being utilized in many food processing, medical diagnosis and chemical industries.Any leak in these systems may cause health hazards [1, 2].detection of in trace amount is very crucial in terms of health and environmental sectors. Ammonia ( ) one of the most highly toxic gas, environmental pollutants and yet being utilized in many food processing, medical diagnosis and chemical industries. Any leak in these systems may cause health hazards [1, 2]. Novel materials such as carbon based nanostructures are exploited for gas detection which varies in their sensing mechanism and concentration range due to its exceptional properties amongst such are high thermal and mechanical stability, high surface-area-to-volume ratio, good metallic and semi conducting behaviour [1, 2, 3, 4]. Carbon nanostructures have been synthesized directly on gallium orthophosphate using alcohol catalytic chemical vapor deposition (ACCVD)

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Results

Conclusion