Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon

Hydrogenated diamond-like carbon (HDLC) films were synthesized through a reactive gas-plasma process employing methane (CH4) and hydrogen (H2) as precursor gases on a silicon (100) wafer substrate, conducted at room temperature. The deposition process utilized a biased enhanced nucleation technique,...

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Published in:Nanomaterials and Energy
Main Author: Biswas H.S.; Mondal A.; Mandal P.; Maiti D.K.; Poddar S.; Sheikh Mohd Ghazali S.A.I.
Format: Conference paper
Language:English
Published: ICE Publishing 2023
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85178249303&doi=10.1680%2fjnaen.23.00065&partnerID=40&md5=c87aa8de522d083090bb55ece91ed090
id 2-s2.0-85178249303
spelling 2-s2.0-85178249303
Biswas H.S.; Mondal A.; Mandal P.; Maiti D.K.; Poddar S.; Sheikh Mohd Ghazali S.A.I.
Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
2023
Nanomaterials and Energy
12
4
10.1680/jnaen.23.00065
https://www.scopus.com/inward/record.uri?eid=2-s2.0-85178249303&doi=10.1680%2fjnaen.23.00065&partnerID=40&md5=c87aa8de522d083090bb55ece91ed090
Hydrogenated diamond-like carbon (HDLC) films were synthesized through a reactive gas-plasma process employing methane (CH4) and hydrogen (H2) as precursor gases on a silicon (100) wafer substrate, conducted at room temperature. The deposition process utilized a biased enhanced nucleation technique, varying the flow rate ratio of hydrogen and methane. The investigations revealed that increasing the methane flow rate led to a reduction in grain size and an augmented nucleation density of HDLC, as evidenced by contact-mode atomic force microscopy (AFM) images. This study demonstrated the effective control of diamond grain growth by introducing high-methane-concentration pulses during deposition. The field emission characteristics of HDLC samples were analyzed, revealing threshold fields of 12.2 V/mm for nanocrystalline films, 8.5 V/mm for subcrystalline films and 4.1 V/mm for microcrystalline films, corroborated by Raman spectra. Surface energy measurements indicated hydrophobic behavior in the samples. Notably, a decrease in the hydrogen/methane ratio was found to increase the sp2 character, which correlated with the emission field. AFM analysis of HDLC samples yielded surface roughness values ranging from 0.2 nm to approximately 0.01 nm, confirming the continuous, non-porous and smooth nature of the surfaces. © 2023 ICE Publishing. All rights reserved.
ICE Publishing
20459831
English
Conference paper

author Biswas H.S.; Mondal A.; Mandal P.; Maiti D.K.; Poddar S.; Sheikh Mohd Ghazali S.A.I.
spellingShingle Biswas H.S.; Mondal A.; Mandal P.; Maiti D.K.; Poddar S.; Sheikh Mohd Ghazali S.A.I.
Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
author_facet Biswas H.S.; Mondal A.; Mandal P.; Maiti D.K.; Poddar S.; Sheikh Mohd Ghazali S.A.I.
author_sort Biswas H.S.; Mondal A.; Mandal P.; Maiti D.K.; Poddar S.; Sheikh Mohd Ghazali S.A.I.
title Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
title_short Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
title_full Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
title_fullStr Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
title_full_unstemmed Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
title_sort Study on particle size and field effect with sp2/sp3 ratio of hydrogenated diamond-like carbon
publishDate 2023
container_title Nanomaterials and Energy
container_volume 12
container_issue 4
doi_str_mv 10.1680/jnaen.23.00065
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85178249303&doi=10.1680%2fjnaen.23.00065&partnerID=40&md5=c87aa8de522d083090bb55ece91ed090
description Hydrogenated diamond-like carbon (HDLC) films were synthesized through a reactive gas-plasma process employing methane (CH4) and hydrogen (H2) as precursor gases on a silicon (100) wafer substrate, conducted at room temperature. The deposition process utilized a biased enhanced nucleation technique, varying the flow rate ratio of hydrogen and methane. The investigations revealed that increasing the methane flow rate led to a reduction in grain size and an augmented nucleation density of HDLC, as evidenced by contact-mode atomic force microscopy (AFM) images. This study demonstrated the effective control of diamond grain growth by introducing high-methane-concentration pulses during deposition. The field emission characteristics of HDLC samples were analyzed, revealing threshold fields of 12.2 V/mm for nanocrystalline films, 8.5 V/mm for subcrystalline films and 4.1 V/mm for microcrystalline films, corroborated by Raman spectra. Surface energy measurements indicated hydrophobic behavior in the samples. Notably, a decrease in the hydrogen/methane ratio was found to increase the sp2 character, which correlated with the emission field. AFM analysis of HDLC samples yielded surface roughness values ranging from 0.2 nm to approximately 0.01 nm, confirming the continuous, non-porous and smooth nature of the surfaces. © 2023 ICE Publishing. All rights reserved.
publisher ICE Publishing
issn 20459831
language English
format Conference paper
accesstype
record_format scopus
collection Scopus
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