A simple, space constrained NIRIM type reactor for chemical vapour deposition of diamond

Abstract

In this paper the design of a simple, space constrained chemical vapour deposition reactor for diamond growth is detailed. Based on the design by NIRIM, the reactor is composed of a quartz discharge tube placed within a 2.45 GHz waveguide to create the conditions required for metastable growth of diamond. Utilising largely off-the-shelf components and a modular design, the reactor allows for easy modification, repair, and cleaning between growth runs.The elements of the reactor design are laid out with the CAD files, parts list, and control files made easily available to enable replication. Finally, the quality of nanocrystalline diamond films produced are studied with SEM and Raman spectroscopy, with the observation of clear faceting and a large diamond fraction suggesting the design offers deposition of diamond with minimal complexity.

High-Energy Excimer Annealing of Nanodiamond Layers

“…According to [ 45 ], diamond films prepared mainly by the CVD method consist of many small micro-/nano-crystalline diamonds surrounded by a graphitic or amorphous carbon phase mainly occurring at their grain boundaries. Due to the presence of these phases, C-H bonds and C-C and C=C transpolyacetal chains are bent/stretched, which causes the appearance of a Raman peak in the region of 1140 cm −1 [ 46 , 47 ] (see the NDs pattern in Figure 6 ). Additionally, the authors of [ 45 ] state that the graphitic (G) peak observed in NDs films prepared in this way was shifted from the graphitic peak of 1580 cm −1 downwards to a broad band in the region of 1500 to 1600 cm −1 .…”

The High Stability and Selectivity of Electrochemical Sensor Using Low-Cost Diamond Nanoparticles for the Detection of Anti-Cancer Drug Flutamide in Environmental Samples

“…This peak corresponds to the vibrational mode involving the stretching and compression of the carbon-carbon (C-C) bonds in the DNPs lattice. Furthermore, the emergence of the G-band peak at approximately 1550 cm −1 can be observed, indicating the presence of in-plane stretching of sp2 bonds within the graphite-like substances [20]. The possible ball-stick and polyhedron structures of DNPs are shown in Figure 1c,d.…”

Diamond‐Based Supercapacitors with Ultrahigh Cyclic Stability Through Dual‐Phase MnO2‐Graphitic Transformation Induced by High‐Dose Mn‐Ion Implantation

“…in Figure 3a) is attributed to first order Raman resonance peak, however, the Raman peak is much broader compared to the as-grown BDD (Curve I. in Figure 3a), which indicates the formation of nanocrystalline diamond particles. [38,39] In addition, a shoulder peak to the first-order Raman resonance peak has appeared at 1355 cm −1 (Figure 3a), which corresponds to the disordered carbon (Dband). [40] The existence of graphitic (sp 2 ) carbon phase by the annealing of Mn-BDD was evidenced by the broad Raman resonance peak centered at 1591 cm −1 of G-band (Figure 3a), demonstrating a shift from 1550 cm −1 (as-grown BDD) to 1591 cm −1 (annealed Mn-BDD).…”