Synthesis Of Graphene From Alternative Precursors And The Use Of Quartz Plate For Carbon Source Manipulation

Graphene is a single layer of carbon atoms arranged in an sp2-hybridized structure with properties far superior compared to other materials. Research and development in graphene synthesis have been rapidly growing the past few years especially using chemical vapor deposition (CVD). However, in order to move graphene from laboratory scale to commercial domain; graphene synthesis cost need to be continually reduced. In this thesis, this problem was approached from a few angles. One of the study in this thesis demonstrate that rice straw and synthetic biogas, typical wastes from the rice and palm oil production industries can be used as inexpensive carbon source for the production of graphene. In the case of rice straw, the lignocellulosic biomass was first put through thermal pyrolysis in order to obtain the bio-oil and bio-char. Only 0.50 mL of bio-oil was then used as carbon source to sufficiently synthesized 1 cm x 1 cm of large area graphene with good quality (ID/IG = ~0.55) via a two-heating source setup ambient pressure CVD (APCVD) . By doing this, the amount of carbon source going out as effluent is reduced as it has been recovered as side-products prior to graphene growth. The bio-char was also used as carbon source for graphene growth but with a novel and facile carbon trapping assisted APCVD involving customized quartz plate. Here, 2.5 mg of bio-char was encapsulated with quartz plate and Cu foil in a specific arrangement which acted as carbon shields and trapped the carbon active species at high temperature within the confined space of the setup. By implementing carbon trapping, lesser amount of carbon source was needed for graphene growth of the same size; graphene growth efficiency increased around 400 %. Lastly, the effluent of the graphene growth process was converted into syngas when synthetic biogas was used as the carbon precursor with Ni as the catalyst at 900 oC in a one-step process; turning waste into wealth

Recent trends in graphene materials synthesized by CVD with various carbon precursors

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Direct growth of graphene on MgO by chemical vapor deposition for thermal conductivity enhancement of phase change material

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Co-synthesis of large-area graphene and syngas via CVD method from greenhouse gases

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Proceedings of International Technical Postgraduate Conference 2022

This conference proceedings contains articles on the various research ideas of the academic & research communities presented at the International Technical Postgraduate Conference 2022 (TECH POST 2022) that was held at Universiti Malaya, Kuala Lumpur, Malaysia on 24-25 September 2022. TECH POST 2022 was organized by the Faculty of Engineering, Universiti Malaya. The theme of the conference is “Embracing Innovative Engineering Technologies Towards a Sustainable Future”.  TECH POST 2022 conference is intended to foster the dissemination of state-of-the-art research from five main disciplines of Engineering: Electrical Engineering, Biomedical Engineering, Civil Engineering, Mechanical Engineering, and Chemical Engineering. The objectives of TECH POST 2022 are to bring together innovative researchers from all engineering disciplines to a common forum, promote R&D activities in Engineering, and promote the dissemination of scientific knowledge and research know-how between researchers, engineers, and students. Conference Title: International Technical Postgraduate Conference 2022Conference Acronym: TECH POST 2022Conference Date: 24-25 September 2022Conference Location: Faculty of Engineering, Universiti Malaya, Kuala Lumpur Malaysia (Hybrid Mode)Conference Organizers: Faculty of Engineering, Universiti Malaya, Kuala Lumpur, Malaysia