Article
Chemistry, Multidisciplinary
Hammam Abdurabu Thabit, Norlaili A. Kabir, Abd Khamim Ismail, Shoroog Alraddadi, Abdullah Bafaqeer, Muneer Aziz Saleh
Summary: This work investigated the thermoluminescence dosimetry characteristics of Ag-doped ZnO thin films. The results showed that the highest thermoluminescence intensity for the thin films occurred at a doping concentration of 0.5 mol% Ag. The optimal thermoluminescence response of the films was observed at an annealing temperature of 400 degrees C and annealing time of 30 minutes.
Article
Materials Science, Multidisciplinary
Mouna Khiari, Michael Lejeune, Mickael Gilliot, Florica Lazar, Aomar Hadjadj
Summary: The original technique developed in this study enables the direct and efficient incorporation of silver metal nanoparticles into ZnO precursor solution, resulting in nanocomposite thin films with a large effective surface area for interaction with the external environment and a large surface area for metal-semiconductor interaction suitable for surface photocatalysis reactions. These nanocomposites exhibit improved photocatalytic performance, stability, and reusability, making them promising for water treatment applications.
Article
Nanoscience & Nanotechnology
Md. Azizar Rahman, S. M. Naimul Mamun, Abul Kashem Mohammad Akther Hossain, Cuong Ton-That
Summary: In this work, an efficient p-n homojunction LED is fabricated based on the secondary growth of Ga-doped ZnO (GZO) nanorods onto a p-type Li-doped ZnO (LZO) thin film. The optimized GZO nanorods and LZO films exhibit low turn-on voltage and bright-yellow-orange electroluminescence. The optimized LED based on the GZO nanorods is 16 times more efficient in EL than the equivalent device made from ZnO nanorods.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Ceramics
Sourav Mondal, Durga Basak
Summary: This study investigates the effect of donor-acceptor compensation in phosphorus-doped zinc oxide thin films grown under different gas atmospheres using photoconductivity and photoluminescence techniques. The results demonstrate that an oxygen-rich environment accelerates the formation of acceptor defects, thereby enhancing the ultraviolet photosensitivity.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
WooJun Seol, Gopinathan Anoop, Hyeonghun Park, Cheol Woong Shin, Jun Young Lee, Tae Yeon Kim, Wan Sik Kim, Hyunjin Joh, Shibnath Samanta, Ji Young Jo
Summary: In this study, V-doped ZnO thin films with high polarization values were successfully prepared by controlling crystallite size, morphology, and valence state of vanadium, opening up the possibility of utilizing ferroelectric VeZnO in particulate matter filtering devices. The study demonstrated the importance of crystalline properties and valence state of V in determining the ferroelectric and dielectric properties of VeZnO films, with potential applications in air filter coatings for efficient particulate matter filtration.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Laya Dejam, Slawomir Kulesza, Jamshid Sabbaghzadeh, Atefeh Ghaderi, Shahram Solaymani, Stefan Talu, Miroslaw Bramowicz, Mitra Amouamouha, Amir Hossein Salehi Shayegan, Amir Hossein Sari
Summary: In this study, thin films of undoped ZnO, ZnO doped with Al, ZnO doped with Cu, and co-doped ZnO with Al and Cu were deposited on quartz substrates using RF sputtering. The samples were investigated for their advanced fractal features, crystalline structure, and optical properties. The results showed that the films had different morphologies and transmission spectra, with the co-doped sample exhibiting the highest transparency in the visible region and a desirable band gap.
RESULTS IN PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Taoufik Slimani Tlemcani, Clement Mauduit, Micka Bah, Meiling Zhang, Matthew Charles, Romain Gwoziecki, Arnaud Yvon, Daniel Alquier
Summary: This study investigates the formation of Au-free Ohmic contacts on p-type GaN using a bilayer Ni/Al-doped ZnO (AZO) thin film. The results show that the contact resistance can be significantly reduced using a suitable thermal process, reaching the lowest value of 1.85 x 10-4 ohm·cm2 for a sample with a 5 nm Ni layer annealed at 500 degrees C in air for 5 min.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Applied
M. Perez-Gonzalez, S. A. Tomas
Summary: Photocatalytic Ag-loaded (TiO2)(0.95)-(ZnO)(0.05) thin films were successfully synthesized using the sol-gel dip-coating method, with the incorporation and surface diffusion of Ag confirmed by secondary ion mass spectrometry measurements. X-ray photoelectron spectroscopy revealed the chemical composition and electronic structure of the samples, confirming the presence of TiO2 and ZnO. The best response in photocatalytic activity was observed in the (TiO2)(0.95)-(ZnO)(0.05) thin films doped with 2 mol% Ag.
Article
Engineering, Electrical & Electronic
Sujun Guan, Lijun Wang, Yuri Tamamoto, Mikihiro Kato, Yun Lu, Xinwei Zhao
Summary: In this study, a simple and effective method for fabricating transparent p-type zinc oxide (ZnO) thin films was developed via molten-salt treatment (MST) in KNO3 for n-type ZnO thin films. The influence of filming temperature during sputtering and the followed MST on various properties of ZnO thin films was investigated, showing improved crystalline quality and surface morphology with higher filming temperature. After MST treatment, the ZnO thin films exhibited p-type characteristics with excellent transmittance and increased mobility.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Tomasz Tanski, Marta Zaborowska, Pawel Jarka, Anna Wozniak
Summary: Hydrophilic and photocatalytically active ZnO and ZnO thin films doped with rare earth metal oxides (Yb2O3 and Eu2O3) were successfully prepared using a combination of sol-gel technique, spin-coating, and thermal treatment. The films exhibited high optical transmittance and were tested for their morphology, chemical composition, roughness, and optical properties. The degradation efficiency of rhodamine B in aqueous solution was also analyzed, showing promising results for water purification. The presented methodology can be applied to coatings for photovoltaic panels and architectural glass structures.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Chuanpu Liu, Kumar Srinivasan, Antony Ajan, Ethan McCollum, Alan Kalitsov, Vijaysankar Kalappattil, Mingzhong Wu
Summary: This work investigates the damping properties of continuous cubic FePt thin films at elevated temperatures through cavity-based high-temperature ferromagnetic resonance measurements. The results show that the FMR linewidth and the Gilbert damping constant increase monotonically with temperature, which is opposite to the behavior observed in granular FePt thin films with L10 structure. These opposite results are attributed to the difference in crystalline structure and microstructure. The study highlights that the temperature dependence of FMR linewidth critically relies on the structural properties of the film and suggests that damping in magnetic thin films can be engineered through control of the structural properties.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Chemistry, Physical
Moez Salem, Hajar Ghannam, Abdullah Almohammedi, Jamel Salem, Yousra Litaiem, Imen Massoudi, Malek Gassoumi, Mounir Gaidi
Summary: Synthesized pure and Ag-doped ZnO nanostructures using a simple co-precipitation method and applied them onto Si substrates. Studied the evolution of nanostructure and opto-electronic characteristics in doped layers with different Ag content. Examined crystal structure and surface morphology of deposited films using XRD and AFM techniques. Investigated surface passivation quality using FTIR and photoconductance-based techniques to understand electronic and optical losses. Lifetime values increased from 1.5 to 106 μs at a density of 5.10(14) cm(-3) according to photoconductance lifetime measurement, while reflectivity decreased from 36% to 6% after deposition of Ag:ZnO on silicon surface.
Article
Engineering, Environmental
Athorn Vora-ud, Anh Tuan Thanh Pham, Dai Cao Truong, Somporn Thoawankeaw, Hoa Thi Lai, Thu Bao Nguyen Le, Nhat Minh Quang Tran, Mekhala Insawang, Pennapa Muthitamongkol, Mati Horprathum, Manish Kumar, Sungkyun Park, Gerald Jeffrey Snyder, Tosawat Seetawan, Thang Bach Phan
Summary: In this study, the thermoelectric properties of Ga and In doped ZnO films (IGZO) deposited on a polyimide substrate were reported, along with the fabrication of 4-unileg flexible IGZO thermoelectric devices. The best power factor was achieved in the IGZO film annealed at 250 degrees C. The practical application of flexible IGZO films was demonstrated through a 4-unileg-IGZO films thermoelectric module.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Physical
Yaoyao Liu, Shuming Jiang, Xu Zhou, Chengtao Xia, Qiang Wu, Xiangyang Ma, Lu Chen, Jianghong Yao, Jingjun Xu
Summary: This study achieved high-concentration F-doped ZnO thin films with high transparency and Hall mobility for the first time via femtosecond-laser hyperdoping. The highest atomic percentage of F reached 8.3 at.%, which was over three times larger than previous reports. The F-doped ZnO showed a significant increase in carrier concentration and decrease in resistivity compared to pristine ZnO. This technology can reduce power dissipation and improve current carrying capacity of ZnO-based devices.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Victor V. Petrov, Irina O. Ignatieva, Maria G. Volkova, Irina A. Gulyaeva, Ilya V. Pankov, Ekaterina M. Bayan
Summary: Transparent Al-doped ZnO films were synthesized by solid-phase pyrolysis and characterized by XRD, SEM, and TEM. The films exhibit wurtzite structure and have a uniform distribution of nanoparticles. The introduction of 1% Al results in a narrowed band gap and improved response time to radiation.
Article
Materials Science, Ceramics
Jaehun Cho, Bo Yang, Chao Shen, Haiyan Wang, Xinghang Zhang
Summary: In this study, Mg-PSZ was prepared by SPS and sequential subeutectoid aging, which could fine-tune its mechanical properties. The Mg-PSZ prepared by SPS had smaller grains and the phase transformation during aging played a crucial role in enhancing fracture toughness and fracture strain. SPS preparation of Mg-PSZ offers rapid and effective approaches in adjusting phases and mechanical properties.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Tongjun Niu, Tianyi Sun, Zhongxia Shang, Yifan Zhang, Zihao He, Wei-Ying Chen, Meimei Li, Haiyan Wang, Xinghang Zhang
Summary: A study found that helium bubble swelling can be effectively controlled by pre-injecting helium in Cu50Ag50, Cu45Ag45Fe10, and Cu33Ag33Fe34 nanocomposites, with Cu33Ag33Fe34 exhibiting smaller bubble swelling compared to Cu50Ag50. This suggests the vital role of Cu-Ag-Fe triphase triple junctions and phase boundaries in managing helium. The study provides a new perspective for improving the radiation tolerance of nanocrystalline alloys through microstructure design.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Crystallography
Nicholas Allen Richter, Xuanyu Sheng, Bo Yang, Benjamin Thomas Stegman, Haiyan Wang, Xinghang Zhang
Summary: Nanotwinned metals, such as Al-Zr alloys, have enhanced physical and mechanical properties, with vertically aligned sigma 3 (112) twin boundaries and grain size-dependent strain rate sensitivity. This study accurately determined the strain rate sensitivity of nanotwinned Al-Zr alloys and demonstrated their remarkable mechanical strengths and thermal stability.
Article
Nanoscience & Nanotechnology
Ulisses Heredia-Rivera, Venkat Kasi, Akshay Krishnakumar, Sachin Kadian, Amit Kumar Barui, Zihao He, Haiyan Wang, Lia Stanciu, Rahim Rahimi
Summary: Cold atmospheric plasma-assisted deposition technology is a solvent-free and scalable method for in situ polymerization and direct deposition of conductive polypyrrole-silver nanocomposites. By adjusting the precursor composition, PPy-Ag nanocomposite films with tunable degrees of polymerization and Ag nanoparticle loading can be fabricated.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
X. Y. Sheng, N. A. Richter, A. Y. Shang, H. Wang, X. Zhang
Summary: The role of Mg solute in facilitating the formation of growth twins in twinned Al-Mg alloys remains unclear. The twinned grain fraction increases with increasing film thickness until it reaches a peak at 120-160 nm. Al-Mg alloys show higher twinned grain fractions compared to pure Al. The increase in twin density is attributed to the impingement of twinned grains during island coalescence and their higher survival rate during grain growth.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Changkyun Lee, David Kortge, Jie Zhu, Jiawei Song, Haiyan Wang, Xiulin Ruan, Peter Bermel
Summary: CeO2 is a rare-earth refractory material that can be used to develop practical thin films for high temperature thermophotovoltaics (TPVs) and thermal barrier coatings (TBCs) due to its high refractive index, high thermal stability, and infrared transparency. This research provides new insights into the effects of temperature change on the electronic structure of CeO2, which is important for the aforementioned applications. Reflectance and transmittance measurements of CeO2 thin films were conducted using Fourier transform infrared (FTIR) spectroscopy at room temperature, and the results can be leveraged for TPV and TBC designs. Additionally, a simulation using the S4 software package showed strong agreement between experimental FTIR reflectance and simulated reflectance at different angles.
Article
Chemistry, Physical
Jack Lopez, Rok Cerne, David Ho, Devin Madigan, Qing Shen, Bo Yang, Joseph Corpus, William Jarosinski, Haiyan Wang, Xinghang Zhang
Summary: Oxide-dispersion-strengthened (ODS) alloys are being used in high temperature turbine, spacecraft, and nuclear reactor components due to their high temperature strength and radiation resistance. A process-synergistic approach using laser powder bed fusion (LPBF) is proposed to introduce oxide particles into ODS alloys. Microstructure analysis reveals the formation of nanoscale spherical mixed oxide particles and large agglomerates with internal cracks. Mechanical testing shows that cracking of agglomerate particles negatively affects the tensile ductility, suggesting a need for improved processing methods to promote the uniform dispersion of oxide particles during laser exposure.
Article
Multidisciplinary Sciences
Markus Hellenbrand, Babak Bakhit, Hongyi Dou, Ming Xiao, Megan O. Hill, Zhuotong Sun, Adnan Mehonic, Aiping Chen, Quanxi Jia, Haiyan Wang, Judith L. MacManus-Driscoll
Summary: A design concept of phase-separated amorphous nanocomposite thin films is presented that enables interfacial resistive switching in hafnium oxide-based devices. By incorporating an average of 7% Ba into hafnium oxide, films consisting of amorphous HfOx host matrix interspersed with Ba-rich nanocolumns are formed. The resistive switching is restricted to an interfacial Schottky-like energy barrier, which can be tuned by ionic migration under an applied electric field. The resulting devices exhibit stable reproducibility and switching endurance, allowing for multiple intermediate resistance states and synaptic spike-timing-dependent plasticity.
Article
Multidisciplinary Sciences
Zhongxia Shang, Tianyi Sun, Jie Ding, Nicholas A. Richter, Nathan M. Heckman, Benjamin C. White, Brad L. Boyce, Khalid Hattar, Haiyan Wang, Xinghang Zhang
Summary: Nanostructured metallic materials with abundant high-angle grain boundaries demonstrate high strength and good radiation resistance. However, the nanoscale grains also impair the tensile ductility. A gradient nanostructured ferritic steel is shown to simultaneously improve yield strength by 36% and uniform elongation by 50% compared to a homogeneously structured counterpart. In-situ tension studies combined with electron backscattered diffraction analyses reveal intricate coordinated deformation mechanisms in the gradient structures. The plastic strain sustained by the outermost nanolaminate grains through a significant deformation mechanism involving prominent grain reorientation contributes to the delay of fracture onset, altering the rupture mode in the post-necking regime. This discovery emphasizes the inherent plasticity of nanolaminate grains and their importance in the simultaneous improvement of strength and tensile ductility in structural metallic materials.
Article
Nanoscience & Nanotechnology
Jiawei Song, Di Zhang, Ping Lu, Yizhi Zhang, Haohan Wang, Hongyi Dou, Xiaoshan Xu, Julia Deitz, Xinghang Zhang, Haiyan Wang
Summary: We report the design of a complex three-phase nanocomposite with ferromagnetic CoFe2, plasmonic TiN, and Au as a multifunctional hybrid metamaterial. By using either a cogrowth or a templated method, we achieved highly uniform and well-integrated structures with excellent epitaxial quality, hyperbolic dispersion, magnetic anisotropy, and magneto-optical coupling effects.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Vidisha Singhal, Jie Zhu, Jiawei Song, Haiyan Wang, Peter Bermel
Summary: This study proposes and optimizes a tri-phase photonic crystal emitter design, which introduces BaZrO3 material into the CeO2 layers of an existing photonic crystal emitter, improving thermal stability. Through simulation and optimization, it is found that the tri-phase variations have minimal impact on the spectral efficiency, with the highest efficiency being only 0.02% lower and the lowest efficiency being only 0.28% lower than the original design. Therefore, tri-phase photonic crystal emitters can be used in practical applications to enhance thermal stability without compromising on spectral efficiency.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Ceramics
Wolfgang Rheinheimer, Xin Li Phuah, Lukas Porz, Michael Scherer, Jaehun Cho, Haiyan Wang
Summary: Flash sintering of SrTiO3 is characterized by high heating rates, resulting in increased dislocation density and plasticity, which facilitates the densification of ceramic powder compacts.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Chang Niu, Gang Qiu, Yixiu Wang, Pukun Tan, Mingyi Wang, Jie Jian, Haiyan Wang, Wenzhuo Wu, Peide D. Ye
Summary: In this study, the chirality of hydrothermally grown 2D Te is identified and analyzed, and gate-tunable nonlinear electrical responses are observed in 2D Te under a magnetic field, with opposite signs in left- and right-handed 2D Te due to the chiral symmetry. The fundamental relationship between spin-orbit coupling and crystal symmetry in two enantiomers provides a viable platform for chirality-based electronic devices.
Article
Chemistry, Multidisciplinary
Jianan Shen, Zedong Hu, Lizabeth Quigley, Haiyan Wang
Summary: This article presents a method for improving the control and morphology tuning of pillar growth in BaTiO3-Au nanocomposites through the use of metal seedings. The effectiveness of this method is demonstrated through experimental results, laying a foundation for future controlled and selective growth of VAN systems.
Article
Nanoscience & Nanotechnology
Muhammed Ramazan Oduncu, Zhifan Ke, Bingyuan Zhao, Zhongxia Shang, Robin Simpson, Haiyan Wang, Alexander Wei
Summary: This research describes the mechanochemical exfoliation and dispersion of graphene nanoplatelets (GrNPs) in volatile aprotic solvents such as ethyl acetate and acetone. The resulting suspensions with concentrations exceeding 300 μg/mL remained stable for 7 weeks at room temperature. The spray-coated GrNPs demonstrated improved reproducibility in electrochemical sensing and enhanced heat dissipation on metal heat sinks.
ACS APPLIED NANO MATERIALS
(2023)
