Article
Multidisciplinary Sciences
Ahmed G. Attallah, Slawomir Prucnal, Maik Buttering, Eric Hirschmann, Nicole Koehler, Stefan E. Schulz, Andreas Wagner, Maciej O. Liedke
Summary: Flash lamp annealing (FLA) is a new curing method for pore precursor's degradation in thin films. A case study on the curing of dielectric thin films is presented. FLA-cured films are being investigated by means of positron annihilation spectroscopy (PAS) and Fourier-transform infrared (FTIR) spectroscopy in order to quantify the nm-scale porosity and post-treatment chemistry, respectively. Results suggest that FLA is able to decompose the porogen and generate interconnected or isolated pore networks with self-sealed pores. FTIR results demonstrate the structural evolution after FLA and Raman spectroscopy suggests the development of a self-sealing layer.
SCIENTIFIC REPORTS
(2023)
Article
Materials Science, Ceramics
Shunuo Bian, Junhua Xu, Lihua Yu, Pingkang Wang, Yaohong Jiang, Chunyan Chen
Summary: This paper investigates the effects of boron doping on the properties of Hf-B-N films. It is found that boron doping can enhance the hardness, wear rate, fracture toughness, and bonding strength of the films, as well as improve their oxidation and corrosion resistance.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Amal Das, Martando Rath, Deleep R. Nair, M. S. Ramachandra Rao, Amitava DasGupta
Summary: This paper reports the electrical, piezoelectric and mechanical properties of aluminum nitride films grown on nanocrystalline diamond. The results show that this hetero-structure can be used for high frequency resonators in 5G applications.
Article
Multidisciplinary Sciences
Jun Li, Corey Carlos, Hao Zhou, Jiajie Sui, Yikai Wang, Zulmari Silva-Pedraza, Fan Yang, Yutao Dong, Ziyi Zhang, Timothy A. Hacker, Bo Liu, Yanchao Mao, Xudong Wang
Summary: In this study, a promising solution that integrates piezoelectricity, stretchability, and biocompatibility in one material system was presented, which is a critical step towards tissue-compatible biomedical devices.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Qi Bu, Jing Hu, Bolin Xiang, Lei Yu, Yuejun Ouyang, Wei Wan, Tai Qiu
Summary: In this study, a binary composite material of CCTO/PVA with admirable dielectric properties was successfully fabricated by optimizing the morphology of CCTO particles. The composite films filled with square CCTO particles exhibited the highest dielectric constant and low dielectric loss, showing promising potential for practical applications in electronics.
MATERIALS RESEARCH BULLETIN
(2022)
Review
Chemistry, Multidisciplinary
Bingbing Yang, Linghua Jin, Renhuai Wei, Xianwu Tang, Ling Hu, Peng Tong, Jie Yang, Wenhai Song, Jianming Dai, Xuebin Zhu, Yuping Sun, Shujun Zhang, Xiaolin Wang, Zhenxiang Cheng
Summary: This paper summarizes the development of bismuth ferrite thin films in recent years, introduces the method and challenges of chemical solution route preparation. It also proposes an all-solution chemical-solution deposition (AS-CSD) method to prepare ferroelectric films with different orientations, and studies their growth, structure, and ferroelectric properties.
Article
Chemistry, Physical
E. Schiliro, S. E. Panasci, A. M. Mio, G. Nicotra, S. Agnello, B. Pecz, G. Z. Radnoczi, I. Deretzis, A. La Magna, F. Roccaforte, R. Lo Nigro, F. Giannazzo
Summary: This paper investigates the atomic layer deposition (ALD) of ultra-thin films of Al2O3 and HfO2 on gold-supported monolayer MoS2, providing insights into the nucleation mechanisms in the early stages of the ALD process. The characterization reveals a tensile strain and p-type doping distribution at the micro-scale, local strain variations at the nanoscale, and atomic scale variability in the Mo-Au atomic distances. Ab initio DFT calculations show the significant influence of the Au substrate on the MoS2 energy band structure and the enhanced physisorption of the precursors due to nanoscale morphological effects. The nucleation and growth of Al2O3 and HfO2 films on 1L-MoS2/Au are studied, revealing slower growth rate for HfO2 and formation of continuous films for both materials at higher ALD cycles. The films show different conductive behavior and strain effects, influencing the MoS2 properties.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Stephen J. Cox, Phillip L. Geissler
Summary: The surface of a polar liquid has different behaviors compared to the bulk liquid when it comes to solvation and organization of charged solutes. Researchers have attempted to understand the electrostatic response at aqueous interfaces by studying the spatial variation of dielectric permittivity, often concluding that the dielectric constant of interfacial water is significantly lower than in the bulk liquid. However, this analysis is complicated by the potentially nonlocal nature of dielectric response over interfacial heterogeneity. In this study, the authors used a thermodynamic approach and molecular simulations to calculate the solvent's contribution to the reversible work of charging a parallel plate capacitor in thin water films. The results showed good agreement with a simple dielectric continuum model, even for very thin films.
Article
Materials Science, Multidisciplinary
Hongzhou Li, Jialian Chen, Qinghua Chen, Ming Liu
Summary: Understanding the nonlinear visco-elastic-plastic behavior of PMMA thin films during nanoindentation is crucial for predicting the plastic deformation of thermoplastic polymer products. The results of experimental investigation and finite element simulation suggest that the Oyen-Cook constitutive equation can accurately describe the time-dependent elastic-plastic deformation of PMMA thin films.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Natalie Smith, Stephanie Guthrie, Zbigniew Dreger, Gaurav Giri
Summary: The study demonstrates the successful crystallization of CL-20 energetic material into thin films using the solution shearing technique, revealing different morphological regimes and confirming the stability of the fi crystal form under thin film confinement.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Physics, Applied
Tapan Kumar Pani, Bibekananda Sundaray
Summary: In this study, single-phase thin films of Bi1-xCaxFeO3 with different Ca concentrations were successfully prepared using spray pyrolysis technique. The structural and magnetic characteristics of the Ca-modified thin films were investigated, demonstrating a significant increase in magnetization with Ca addition.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Physical
Pei Bai, Mingchao Ma, Li Sui, Yunlong Guo
Summary: This study demonstrates significant changes in stiffness and the ratio between elastic and viscous responses in thin PDMS films under nanoconfinement, with an enhanced elastic modulus and increased viscous response observed. The results contribute to a better understanding of the nanoconfinement effect on viscoelastic properties of soft matter.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Yujie Yang, Huihuang Huang, Songxue Bai, Fang Yao, Qianqian Lin
Summary: Silver antimony sulfide, a ternary chalcogenide compound, has great potential in the field of optoelectronics. In this study, the composition engineering of silver antimony sulfide compounds was systematically investigated, and high-performance phototransistors based on this material were successfully demonstrated.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Zengguang Cheng, Tara Milne, Patrick Salter, Judy S. Kim, Samuel Humphrey, Martin Booth, Harish Bhaskaran
Summary: The research demonstrates the potential of using nanometer-scale metals to enhance light-matter interactions, with antimony as a pure metal capable of optically programmable transitions between two states. Its application prospects lie in optoelectronic modulation and switching speed, showcasing the simplicity and potential for various optoelectronic applications requiring actively tunable metallic conductors.
Article
Materials Science, Multidisciplinary
Haixing Cao, Xianming Ren, Meibing Ma, Xin Yin, Yemei Han, Kai Hu, Zheng Sun, Fang Wang, Kailiang Zhang
Summary: The study presented a single-phase multiferroic spinel CoFe1.6Al0.4O4 with ferrimagnetic and ferroelectric properties at room temperature. The CoFe1.6Al0.4O4 films exhibit a spinel structure with Fd (3) over bar m space group, showing typical ferroelectric hysteresis and significant piezoresponse displacement at room temperature. The ferroelectric order likely originates from possible atomic orderings in cationic sublattices and local deformation induced by the substitution of Al ions at the sublattices of CoFe2O4 in the CoFe1.6Al0.4O4 spinel.
Article
Materials Science, Multidisciplinary
Travis D. Frazer, Joshua L. Knobloch, Jorge N. Hernandez-Charpak, Kathleen M. Hoogeboom-Pot, Damiano Nardi, Sadegh Yazdi, Weilun Chao, Erik H. Anderson, Marie K. Tripp, Sean W. King, Henry C. Kapteyn, Margaret M. Murnane, Begona Abad
PHYSICAL REVIEW MATERIALS
(2020)
Article
Physics, Applied
Claudia Cancellieri, Ethan A. Scott, Jeffrey Braun, Sean W. King, Ron Oviedo, Christopher Jezewski, John Richards, Fabio La Mattina, Lars P. H. Jeurgens, Patrick E. Hopkins
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Physics, Applied
Ethan A. Scott, Jeffrey L. Braun, Khalid Hattar, Joshua D. Sugar, John T. Gaskins, Mark Goorsky, Sean W. King, Patrick E. Hopkins
Summary: This study focuses on the thermal conductivity of amorphous carbon created in diamond via nitrogen ion implantation. Various measurement techniques are used to investigate its thermal properties, revealing a thermal conductivity of approximately 1.4Wm -1 K -1, comparable to that of amorphous carbon films fabricated through other methods.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Ethan A. Scott, Sean W. King, Nanette N. Jarenwattananon, William A. Lanford, Han Li, James Rhodes, Patrick E. Hopkins
Summary: The thermal conductivity of amorphous solids can be increased through ion irradiation, altering the bonding network configuration. Films with higher initial hydrogen content show the greatest enhancement, accompanied by stiffening and densification from the irradiation process. This enhancement in vibrational transport is unique compared to the structural degradation and reduced thermal conductivity typically seen in ion conductivities of crystalline materials.
Article
Materials Science, Multidisciplinary
Jeffrey L. Braun, Sean W. King, Eric R. Hoglund, Mehrdad Abbasi Gharacheh, Ethan A. Scott, Ashutosh Giri, John A. Tomko, John T. Gaskins, Ahmad Al-kukhun, Gyanendra Bhattarai, Michelle M. Paquette, Georges Chollon, Benjamin Willey, G. Andrew Antonelli, David W. Gidley, Jinwoo Hwang, James M. Howe, Patrick E. Hopkins
Summary: This study thoroughly investigated the thermal conductivity of hydrogenated amorphous silicon nitride (a-SiNx:H) and found that hydrogen incorporation disrupts bonding among silicon and nitrogen atoms, leading to significant variations in heat transfer. Chemical, vibrational, and structural analysis revealed that changes in hydrogen content directly impact the thermal conductivity by affecting average atomic distances.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Physics, Applied
Elias B. Frantz, David J. Michalak, Nicholas J. Harmon, Eric M. Henry, Stephen J. Moxim, Michael E. Flatte, Sean W. King, James S. Clarke, Patrick M. Lenahan
Summary: The study investigates the effects of silicon isotopic abundance on EDMR and NZFMR effects observed on unpassivated Si/SiO2 metal-insulator-semiconductor capacitors. The results show a significant narrowing of the NZFMR response upon removal of Si-29 nuclei, with superhyperfine interactions playing a crucial role in determining the response breadth. It is strongly suggested that leakage currents involve tunneling from Si/SiO2 P-b dangling bonds to defects within the oxide, indicating a dominant role of Si/SiO2 interface trap defects in the observed phenomena.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Elias B. Frantz, David J. Michalak, Nicholas J. Harmon, Eric M. Henry, Michael E. Flatte, Sean W. King, James S. Clarke, Patrick M. Lenahan
Summary: The study provides insights into the tunneling phenomenon in Si/SiO2, showing that the trap-assisted tunneling spectra are dominated by silicon dangling bonds at the Si/SiO2 interface. The presence of Si-29 nuclei and hydrogen greatly affects the NZFMR response, indicating the importance of interface trap defects in the tunneling process.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Elias B. Frantz, Nicholas J. Harmon, David J. Michalak, Eric M. Henry, Michael E. Flatte, Sean W. King, James S. Clarke, Patrick M. Lenahan
Summary: This study investigates the low-frequency EDMR and NZFMR responses observed on unpassivated Si-28/(SiO2)-Si-28 MIS capacitors, demonstrating the connection between the spin-mixing mechanism and NZFMR response. By fitting the spectra, a dipolar coupling constant can be extracted, suggesting magnetic dipolar interactions between P-b centers at the interface are responsible for the NZFMR response in the absence of electron-nuclear hyperfine interactions.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sandip Thakur, Connor Jaymes Dionne, Pravin Karna, Sean W. King, William Lanford, Han Li, Shouvik Banerjee, Devin Merrill, Patrick E. Hopkins, Ashutosh Giri
Summary: This study investigates the effects of mass density and atomic coordination on the thermal conductivity and vibrational characteristics of amorphous silicon carbide systems. The results reveal the significant role of atomic coordination in dictating the contributions from propagating and nonpropagating modes.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Gheorghe Stan, Cristian V. Ciobanu, Sean W. King
Summary: Atomic force microscopy (AFM) is a widely used tool for surface characterization, capable of quantitatively determining the depth and mechanical properties of thin films. It offers nondestructive and robust techniques for probing layer thickness, subsurface features, and elastic properties in various fields such as semiconductor electronics, additive manufacturing, and biomaterials.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Vamseedhara Vemuri, Sean W. King, William A. Lanford, John T. Gaskins, Patrick Edward Hopkins, Jeremy Van Derslice, Han Li, Nicholas C. Strandwitz
Summary: Thermal processing of MLD alucone films can produce porous and low-k materials. The chemical evolution of the films during heating was studied using various spectroscopy techniques. The lowest dielectric constant of the processed alucone films was lower than that of ALD alumina films.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Rupak Thapa, Lauren M. Dorsett, Raja Sekhar Bale, Suhaib Malik, Stefan C. Wagner, Derrick Bailey, Jacob Stoehr, Anthony N. Caruso, Jeffery D. Bielefeld, Sean W. King, Michelle M. Paquette
Summary: Carborane (C2B10H12) molecules are unique precursors for self-assembled monolayer (SAM) applications. These 3D, icosahedral (12-vertex) molecules allow for well-ordered layers formation with fewer defects compared to traditional linear alkyl SAMs. Post-growth treatments like heat and plasma can be used to crosslink and stabilize the films. These carborane thiol SAMs show stability to thermal and plasma treatment, with some changes in boron coverage and oxidation. The films can be further stabilized and modified by plasma treatment and may have various applications in functional and protective layers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Review
Engineering, Electrical & Electronic
Gheorghe Stan, Sean W. King
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)
Article
Engineering, Electrical & Electronic
Michelle M. Paquette, Anthony N. Caruso, Justin Brockman, Jeff Bielefeld, Markus Kuhn, Sean W. King
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2020)
Article
Engineering, Electrical & Electronic
Donghyi Koh, Sanjay K. Banerjee, Chris Locke, Stephen E. Saddow, Justin Brockman, Markus Kuhn, Sean W. King
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2019)
