Article
Crystallography
Somnath Bhattacharyya
Summary: Unconventional superconductivity in heavily boron-doped nanocrystalline diamond films has attracted significant interest. The anisotropic superconducting order parameter in these films is believed to be due to the complex structure formed by boron atoms and the introduction of spin-orbit coupling. Breaking the structural symmetry in a layered microstructure reveals the signature of the anisotropic order parameter and explains various transport features observed in these films. The interface states in diamond films can be described by the Shockley model, forming a topologically protected system.
Review
Materials Science, Multidisciplinary
Orlando Auciello, Dean M. Aslam
Summary: This comprehensive review highlights the progress made in the fundamental and applied materials science of diamond films, focusing on synthesis processes, characterization of properties, integration with other materials, and optimization for MEMS/NEMS device performance. The ultimate goal is to produce transformative impact on global quality of life through the development of advanced sensors, energy generation devices, and other MEMS/NEMS technologies.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
James E. Nathaniel, Gregory A. Vetterick, Osman El-Atwani, Asher Leff, Jon Kevin Baldwin, Pete Baldo, Marquis A. Kirk, Khalid Hattar, Mitra L. Taheri
Summary: This study provides experimental evidence that grain size and irradiation induced defect morphology are not directly correlated, and the addition of solute can alter the final damage state.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Chemistry, Physical
Jae-Eun Kim, Joong Il Jake Choi, Jeongjin Kim, Bongjin Simon Mun, Ki-Jeong Kim, Jeong Young Park
Summary: The study found that friction increased with the pressure of oxygen, remained unchanged in nitrogen gas, and decreased in water due to tribochemical reactions. The dissociation of water molecules under water conditions resulted in reduced friction force between diamond materials. This research sheds light on the important role of vapor-phase oxygen and water in the tribological properties of carbon-based materials.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Brijmohan Paramanik, Debajyoti Das
Summary: In this study, diamond-like carbon (DLC) films with well distinguished nanocrystalline diamond (NCD) grains embedded in the matrix were grown on glass substrates without any pre-treatment using a specially-designed stainless-steel shadow-mask assembly. The composition of the precursor gas and gas pressure in the plasma significantly influenced the relative composition of different carbon phases in the films. The optimum NCD embedded DLC film exhibited a homogeneous microstructure with uniform distribution of NCD grains and high optical transmittance.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
A. M. Gorbachev, A. A. Vikharev, A. V. Afanasiev, A. L. Vikharev, I. V. Bandurkin, D. B. Radishev, M. N. Drozdov, S. A. Bogdanov
Summary: This study focuses on the experimental investigation of electron photoemission from phosphorus-doped nanocrystalline diamond films under the influence of laser radiation with a wavelength of 266 nm and a pulse duration of 15 ns. Homogeneous NCD films with a thickness of 50-1200 nm were grown on conductive silicon substrates using chemical vapor deposition. The phosphorus content in the films was controlled by adjusting the phosphine content in the hydrogen-methane gas mixture and the substrate temperature. The research established a relationship between the growth conditions, NCD film thickness, and the measured quantum efficiency of diamond photocathodes, revealing that heavily doped NCD films with H-terminated surface of 50 nm thickness exhibit the highest quantum efficiency of 3*10(-5).
Article
Materials Science, Multidisciplinary
Matthew J. Patrick, Gregory S. Rohrer, Ooraphan Chirayutthanasak, Sutatch Ratanaphan, Eric R. Homer, Gus L. W. Hart, Yekaterina Epshteyn, Katayun Barmak
Summary: Grain boundary character distributions (GBCD) can be measured from microcrystalline samples using electron backscatter diffraction (EBSD) and can be used to reconstruct relative grain boundary energy distributions (GBED) based on the 3D geometry of triple lines, assuming the force balance condition is satisfied. However, for nanocrystalline thin films, the GBED cannot be extracted effectively using orientation mapping via precession enhanced electron diffraction (PED). In this study, the relative energy extraction technique was adapted to PED data and the results showed that the GBED extracted from these films do not correlate with energies calculated using molecular dynamics (MD) or with the experimentally determined GBCD. This suggests that additional geometric factors contribute to determining the triple junction geometry and boundary network structure in these films.
Article
Chemistry, Multidisciplinary
Brenton Cook, Philipp Reineck, Thomas Shiell, Jodie Bradby, Bryan D. Esser, Joanne Etheridge, Bianca Haberl, Reinhard Boehler, David R. Mckenzie, Dougal G. McCulloch
Summary: Diamond is a crucial material for biosensors, quantum computing, and space components due to its unique properties at the nanoscale. Researchers have successfully synthesized oriented, faceted diamond particles by flash laser heating of glassy carbon, and observed their microstructure and periodicity.
Article
Nanoscience & Nanotechnology
Tapati Jana, Romyani Goswami
Summary: Undoped hydrogenated silicon oxide thin films were prepared using RF PECVD method, and the impact of carbon dioxide dilution on their optoelectronic and structural properties was thoroughly studied. The films were analyzed for surface morphology using various microscopy techniques, revealing the presence of uniformly embedded silicon nanocrystallites. FTIR spectra showed an initial increase followed by a decrease in oxygen content with increasing carbon dioxide dilution, with films having lower oxygen content exhibiting stronger PL peaks.
Article
Materials Science, Coatings & Films
Qiang Lin, Sulin Chen, Zhe Ji, Zhewei Huang, Zhinan Zhang, Bin Shen
Summary: The study revealed that the wear of diamond films at low temperatures is mainly induced by the strong adhesion between diamond and titanium, while at high temperatures, oxygen significantly etches the diamond films, causing loss of carbon atoms and increased wear.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Coatings & Films
Qiang Lin, Sulin Chen, Zhe Ji, Zhewei Huang, Zhinan Zhang, Bin Shen
Summary: This study demonstrates the deposition of UNCD films can be achieved in CH4/H-2 chemistry without Ar, and the re-nucleation rate can be specifically regulated by adjusting gas pressure and carbon concentration. A novel kinetic growth model was established to interpret the UNCD growth mechanism with CH4/H-2 chemistry, and the atmospheric window for the deposition of UNCD films was obtained. The study provides insights into the UNCD growth mechanism without Ar content and simplifies the gas strategy for UNCD growth.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jiwon Jeong, Woo-Sung Jang, Kwang Hun Kim, Aleksander Kostka, Gilho Gu, Young-Min Kim, Sang Ho Oh
Summary: This study evaluates two advanced, automated crystal orientation mapping techniques suitable for nanocrystalline materials. The comparison shows that TEM-PED is more reliable for characterizing grains oriented along low-index zone axes, while SEM-TKD is better at detecting small misorientation between grains, providing better quantification and statistical analysis of grain orientation. Both techniques are complementary tools for nanocrystalline materials and can be selected based on analysis requirements, as they have competitive performance in terms of angular resolution and texture quantification.
MICROSCOPY AND MICROANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Libo Fu, Chengpeng Yang, Yan Lu, Jiao Teng, Deli Kong, Yizhong Guo, Ze Zhang, Lihua Wang, Xiaodong Han
Summary: The study found that there are three different types of detwinning mechanisms in nanocrystalline AuAg alloys, which are caused by grain boundary migration, combined layer-by-layer thinning and incoherent twin boundary migration, and collective motion of partial dislocations in an array.
SCIENCE CHINA-MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Chengke Chen, Binjie Tang, Hui Xu, Jinping Pan, Meiyan Jiang, Xiao Li, Xiaojun Hu
Summary: In this study, a low-pressure annealing treatment was used to enhance the EFE properties of UNCD films without doping. The improved EFE current densities were attributed to the refinement of diamond grains and the formation of a conductive network.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
B. C. Hornbuckle, K. Solanki, K. A. Darling
Summary: Adjusting the composition of copper-tantalum alloys can improve material stability and mechanical strength, making them potentially useful in high-temperature environments.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
