Cho, Jung Min Lee, Hak Joo Ko, Young Jin CHOI, HEON JIN Baik, Young Joon Hwang, Gyu Weon PARK, JONG KEUK Kwak, Joon Young Kim, Jae wook Park, Jongkil Jeong, Yeon Joo Kim, In ho LEE, KYEONG SEOK Lee, Wook Seong 2024-01-12T02:35:58Z 2024-01-12T02:35:58Z 2022-10-13 2022-11 2468-0230 https://pubs.kist.re.kr/handle/201004/75963 Synthesis of the porous chemical vapor deposition (CVD) diamond layer, which might enable many noble applications, usually employed the template growth or post-processing, which accompanied the undesirable complexity and cost issues. In a small number of the porous diamond layer synthesis efforts, majority of them employed the plasma-assisted CVD (PA-CVD), while the hot-filament CVD (HF-CVD) was well known for its outstanding scalability and cost-effectiveness. Here we demonstrate a post-processing/template-free approach for the porous diamond layer synthesis by HF-CVD. Intriguingly, we found that the seeding the substrate by detonation nanodiamond (DND) and the relatively low substrate temperature were key enabling factors. The consolidated layer was consisted of quasi-spherical nanodiamond particles. Such observations suggested a precipitation-relevant growth mechanism, which we disproved here, and we clarified an alternative bottom-up growth mechanism. We also demonstrated a preliminary result of applying the porous diamond layer as a waveguide in the attenuated-total-reflection (ATR)-type waveguide mode resonance sensor. English Elsevier Bottom-up evolution of consolidated porous diamond layer by hot-filament-CVD Article 10.1016/j.surfin.2022.102362 1 Surfaces and Interfaces, v.34 Surfaces and Interfaces 34 N scie scopus 000928474900003 Chemistry, Physical Materials Science, Coatings & Films Physics, Applied Physics, Condensed Matter Chemistry Materials Science Physics Article CVD diamond Porous diamond layer Nucleation/growth mechanism One-batch synthesis Hot-filament CVD Optical waveguide