Development of Large Diamond Synthesis by Double Test Tubes Hot Filament Chemical Vapor Deposition

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dc.contributor.authorSodngam, Piyachat
dc.contributor.authorMeekluab, Prapassorn
dc.contributor.authorSiriwongrungson, Vilailuck
dc.contributor.authorNeamchalern, Surasak
dc.contributor.authorTitiroongraung, Wisut
dc.date.accessioned2026-08-06T10:14:59Z
dc.date.available2026-08-06T10:14:59Z
dc.date.issued2017-01-01
dc.description.abstractIn this research, “diamond” synthesis device by double test tubes hot filament chemical vapor deposition (HFCVD) was developed and proposed. Remaining hydrogen was reused for the maximum utilization of resources. In addition, this diamond synthesis device is capable to synthesis diamond continuously of up to 60 h per time. As a result, large diamond as large as 1.85 mm and 1.73 mm can be produced from the synthesis of three times with 180 h in total. Moreover, after each synthesis, the quality of diamond crystal was improved by annealing in hydrogen atmosphere. The crystal size was measured and physical characteristics of diamond were analyzed using scanning electron microscopy (SEM). The increasing rate of diamond crystal size after each synthesis was also examined. In addition, electrical properties of the synthetic diamond was compared with natural diamond from room temperature (25°C) to 200°C. The synthetic diamond has the resistance of 1337.28 M?, which the natural diamond has the resistance of 1428.67 M?. Temperature changes has no effect on the resistance of the diamond crystal. Moreover, the synthetic diamond was confirmed to be diamond using Raman spectroscopy. It has the same peak as the natural diamond at the Raman shift of 1332 cm<sup>-1</sup>.
dc.identifier.citationLecture Notes in Engineering and Computer Science, 2228, 745-749, 2017
dc.identifier.issn20780958
dc.identifier.other2-s2.0-85041180294
dc.identifier.urihttps://dspace.kmitl.ac.th/handle/123456789/7198
dc.sourceLecture Notes in Engineering and Computer Science
dc.subjectDouble test tubes HFCVD
dc.subjectLarge Diamond
dc.titleDevelopment of Large Diamond Synthesis by Double Test Tubes Hot Filament Chemical Vapor Deposition
dc.typeConference Paper

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