Article
Chemistry, Multidisciplinary
Marco Bertelli, Adriano Diaz Fattorini, Sara De Simone, Sabrina Calvi, Riccardo Plebani, Valentina Mussi, Fabrizio Arciprete, Raffaella Calarco, Massimo Longo
Summary: The morphological, structural, and electrical properties of as-grown and annealed Ge2Sb2Te5 (GST) layers on flexible polyimide were investigated. The results showed that the GST layers undergo a structural transformation from amorphous to crystalline phases at around 140 degrees C. The crystalline GST layers exhibited good vibrational and electrical properties.
Article
Materials Science, Multidisciplinary
Asmaa Al-Rasheedi, N. H. Alonizan, Akhlur Rahman Ansari, A. M. Abdel-Daiem, M. S. Aida
Summary: In this study, ZnO nanorods were successfully grown on glass substrate using the hydrothermal method, and the effect of zinc precursor salt concentration on nanorod properties was investigated. XRD, SEM, UV-visible optical transmittance and PL were used to analyze the structure and properties of the nanorods. The results showed that increasing the salt solution concentration led to the formation of ZnO nanorods with larger diameter and denser array.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Physics, Multidisciplinary
S. S. Shenouda, M. Saif, E. Baradacs, B. Parditka, T. Fodor, Z. Erdelyi
Summary: Thin films of ZnO with different thicknesses (ranging from 8 to 40 nm) prepared by plasma-enhanced atomic layer deposition exhibit nano-crystalline structure with high degree of disorder. The film with a thickness of 20 nm shows the highest percentage of non-lattice oxygen and optimum photocatalytic activity. These films have a strong ability to treat water contaminated with organic dyes and also exhibit photoinduced super-hydrophilicity.
Article
Engineering, Electrical & Electronic
Mahmoud K. Abdel-Latif, Mohamed Mobarak, Neerish Revaprasadu, Abdel Hameed Ashraf, Waled Othman, Moatasem Mostafa Khalefa, Ahmed A. Aboud, Motaz Ismail
Summary: This study investigates the optical and electrical properties of pure and lanthanum-doped zinc oxide thin films prepared using the spray pyrolysis technique. X-ray diffraction shows that crystalline ZnO thin films with (002) preferred orientation are formed after La-doping. Raman spectra confirm the deposition of single ZnO phase without impurity phases. The optical bandgap increases upon doping, reaching a maximum at 3 wt% La-content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Bikram Keshari Das, Tanushree Das, Dipteerekha Das
Summary: A simple negative temperature coefficient (NTC) thermistor material ZnO was synthesized by mechanical alloying and its structural and microstructural properties were investigated. Electrical properties were studied in the temperature range of 300-500 degrees C and frequency range of 100 Hz-1 MHz. The synthesized sample showed typical NTC behavior and the Steinhart-Hart equations were used to analyze its suitability for thermistor application.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Materials Science, Multidisciplinary
Seval Aksoy Pehlivanoglu, Ozgur Polat
Summary: ZnO and Ir-doped ZnO thin films were fabricated by sol-gel spin coating technique. The structures and properties of the films were investigated. The addition of Ir increased the volume of the unit cell, atomic packing fraction, and grain size of the thin films. Optical bandgap decreased with Ir substitution. The transmittance and optical dielectric properties were also affected by Ir doping.
Article
Metallurgy & Metallurgical Engineering
Emine Guneri, Johnson Henry, Fatma Gode, Nilgun Kalaycioglu Ozpozan
Summary: Pure ZnO and Mn-doped ZnO thin films were prepared by chemical bath deposition method with various Mn doping concentrations. The structural, morphological, and optical properties of the films were analyzed using different techniques. XRD analysis revealed hexagonal structured ZnO in all films, with a peak shift observed in Mn-doped films. The crystallite size increased with Mn doping. The surface morphology of Mn-doped films exhibited irregularly shaped agglomerated particles. The transmittance spectra showed higher transmittance in the visible region, which decreased with Mn doping, indicating increased optical absorption. The band gap of Mn-doped films decreased with Mn doping. Mn-doped films exhibited higher optical and electrical conductivity in the UV region.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Chemistry, Physical
M. Popa, L. C. Pop, G. Schmerber, C. Bouillet, O. Ersen
Summary: Poly crystalline Holmium-doped zinc oxide thin films were successfully prepared using sol-gel method. The films exhibited changes in particle size, morphology, and band gap with increasing Ho concentration, demonstrating a direct link between Ho emission and its incorporation in the ZnO matrix.
APPLIED SURFACE SCIENCE
(2021)
Article
Optics
M. S. Aida, M. Sh Abdel-wahab, Ahmed H. Hammad
Summary: Zinc oxide thin films containing samarium were prepared by RF sputtering, with the presence of Sm leading to a decrease in crystalline nature and improved surface roughness. The absorption edge of the samples shifted to higher photon energy with increasing Sm content. The study discussed linear and non-linear optical parameters and photoluminescence in relation to Sm content.
Article
Chemistry, Physical
Kyung-Mun Kang, Yue Wang, Minjae Kim, Chan Lee, Hyung-Ho Park
Summary: AFZO thin films were prepared through atomic layer deposition with improved electrical and optical properties compared to AZO films, attributed to increased carrier concentration and mobility via codoping with F and Al.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
V. L. Patil, D. S. Dalavi, S. B. Dhavale, N. L. Tarwal, S. A. Vanalakar, A. S. Kalekar, J. H. Kim, P. S. Patil
Summary: This report focuses on the deposition of nanocrystalline aluminium doped ZnO (Al doped ZnO: AZO) samples on seeded glass substrates using a cost-effective reflux method. The doping concentration of 'Al' ions ranged from 1 to 3 vol%. The study found that the deposited AZO samples exhibited a wurtzite hexagonal crystal structure and the formation of nanorods for undoped ZnO, with a reduction in diameter and the formation of fine tips for AZO samples. The photoluminescence study confirmed the presence of oxygen vacancies and defects in the AZO samples. Furthermore, the AZO samples demonstrated excellent gas sensing performance towards NO2 gas at a temperature of 175 degrees C, with a gas sensitivity of 85% for 5 ppm NO2 gas. This work shows promise for practical applications in the gas sensor technology field, particularly for low detection limits at low operating temperatures.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Multidisciplinary
Maya Chauhan, Vinod Kumar Singh
Summary: This study reports an intensity-modulated and reflection-based salinity sensor using ZnO nanorods coating. The sensor shows good sensitivity, reproducibility, and durability, making it suitable for monitoring and controlling salt concentration in water resources.
Article
Engineering, Electrical & Electronic
Mona A. A. Mohaseba, Ahmed A. A. Aboud
Summary: This study investigated the impact of lead concentration (0-1 wt%) on the physical properties and photo-detection properties of zinc oxide thin films. All films were deposited using Aerosol Assisted Chemical Vapor Deposition (AACVD) techniques and characterized through various methods. X-ray diffraction analysis revealed the formation of single-phase hexagonal ZnO thin films with preferred orientation changes at a Pb concentration of 0.5wt%. The formation of nano-rods was observed in films prepared with 0.5 and 1wt% lead. The band gap values increased with increased Pb doping. The deposited films exhibited high sensitivity to UV light after long exposure.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
ChenLin Wang, MinJu Ying, Jie Lian, MingYang Wei, QingFen Jiang, Qian Li, Yu Zhang, Zhen Xu, YueMing Wang
Summary: In this study, O-polar ZnO films were prepared using molecular beam epitaxy and ion implantation was used to introduce Co ions and Sm ions into the films. Various characterization techniques were employed to study the structure, optical, and dielectric properties of the samples. The results showed changes in surface roughness and dielectric properties after ion implantation, indicating potential for application in optoelectronic devices.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Chenlin Wang, MinJu Ying, Jie Lian, MingYang Wei, Qingfen Jiang, Zhen Xu, Yu Zhang, Yueming Wang
Summary: In this work, ion implantation of Mn and As ions into ZnO films significantly altered their optical properties, leading to changes in refractive index and extinction coefficient. The presence of Mn ions also introduced a halfmetallic property to the ZnO films, resulting in gentler variations in optical characteristics. These findings suggest new possibilities for the design and optimization of optoelectronic devices utilizing ZnO thin films with semi-metallic properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Multidisciplinary Sciences
Akihiro Kuwahata, Takahiro Kitaizumi, Kota Saichi, Takumi Sato, Ryuji Igarashi, Takeshi Ohshima, Yuta Masuyama, Takayuki Iwasaki, Mutsuko Hatano, Fedor Jelezko, Moriaki Kusakabe, Takashi Yatsui, Masaki Sekino
SCIENTIFIC REPORTS
(2020)
Article
Physics, Applied
Kiyoshi Yatsui, Hidehiko Asaoka, Yuta Yoshida, Takashi Yatsui
JAPANESE JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nanoscience & Nanotechnology
Chih-Zong Deng, Ya-Lun Ho, J. Kenji Clark, Takashi Yatsui, Jean-Jacques Delaunay
Article
Nanoscience & Nanotechnology
Sarath Raman Nair, Lachlan J. Rogers, Xavier Vidal, Reece P. Roberts, Hiroshi Abe, Takeshi Ohshima, Takashi Yatsui, Andrew D. Greentree, Jan Jeske, Thomas Volz
Article
Nanoscience & Nanotechnology
Takashi Yatsui, Yuki Nakamura, Yosuke Suzuki, Tatsuki Morimoto, Yuma Kato, Muneaki Yamamoto, Tomoko Yoshida, Wataru Kurashige, Nobuyuki Shimizu, Yuichi Negishi, Kenji Iida, Katsuyuki Nobusada
JOURNAL OF NANOPHOTONICS
(2020)
Article
Engineering, Electrical & Electronic
Takahiro Kitaizumi, Akihiro Kuwahata, Kota Saichi, Takumi Sato, Ryuji Igarashi, Takeshi Ohshima, Yuta Masuyama, Takayuki Iwasaki, Mutsuko Hatano, Fedor Jelezko, Moriaki Kusakabe, Takashi Yatsui, Masaki Sekino
Summary: The study developed a unique shaped ferromagnetic core and optimized the magnetic field generation system to improve magnetic sensitivity and detectable distance. The proposed magnetic core enhances the excitation field strength at a longer distance and suppresses the bias field strength at the location of the diamond quantum sensor.
IEEE TRANSACTIONS ON MAGNETICS
(2021)
Article
Multidisciplinary Sciences
Takashi Yatsui, Felix Brandenburg, Benjamin Leuschel, Olivier Soppera
Summary: The study found that the squared power dependency of volume increase during the coating process originated from NF-assisted second-harmonic generation and excitation.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Zhiyu Wang, Ya-Lun Ho, Tun Cao, Takashi Yatsui, Jean-Jacques Delaunay
Summary: The study presents a one-dimensional nanostructure with rich Fano resonances induced by interference between a lossy background provided by a metal thin film and a discrete optical Tamm state. A drastic change in the Fano line shape can be achieved by controlling the metal thin film, leading from a narrowband perfect absorber to a narrowband perfect reflector.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Physics, Applied
Kiyoshi Yatsui, Chihiro Yamada, Yuta Yoshida, Takashi Yatsui
Summary: Thick films of lacquers by Wajima-nuri coated on the barrel and bell of a clarinet can significantly change sound characteristics, enhancing clarity and intensity of the sound.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Ryuichi Hirota, Toru Murayama, Ryota Katsumi, Tokuhisa Kawawaki, Shin Yabukami, Ryuji Igarashi, Yuichi Negishi, Moriaki Kusakabe, Masaki Sekino, Takashi Yatsui, Akihiro Kuwahata
Summary: In this letter, a virus detection method using the second harmonics is proposed to improve the signal intensity. The second harmonic signal to noise ratio is approximately three times higher than that of the third harmonic. The ratio of the second harmonic to the fourth harmonic is found to be more sensitive in identifying changes in virus concentration. The proposed method has the potential for rapid screening in virus detection.
IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING
(2022)
Article
Physics, Applied
Ryota Katsumi, Masaki Sekino, Takashi Yatsui
Summary: In this study, a ultra-sensitive diamond magnetometer based on nanocavities is proposed to overcome the limitations of traditional NV-based magnetometers in terms of experimental magnetic field sensitivity, spatial resolution, and excitation power. The device structure enhances the photon emission intensity and collective efficiency of the NV ensemble, enabling efficient photon collection even considering the positional distribution of the NV centers.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Ryota Katsumi, Takeshi Hizawa, Akihiro Kuwahata, Shun Naruse, Yuji Hatano, Takayuki Iwasaki, Mutsuko Hatano, Fedor Jelezko, Shinobu Onoda, Takeshi Ohshima, Masaki Sekino, Takashi Yatsui
Summary: This study demonstrates the hybrid integration of a silicon nitride grating structure on a single-crystal diamond, enabling the implementation of nanostructures in diamond without complicated nanofabrication processes. The integrated grating structure enhances the collected NV emissions and improves the magnetic sensitivity of the device.
APPLIED PHYSICS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Ryuichi Hirota, Toru Murayama, Ryota Katsumi, Tokuhisa Kawawaki, Shin Yabukami, Ryuji Igarashi, Yuichi Negishi, Moriaki Kusakabe, Masaki Sekino, Takashi Yatsui, Akihiro Kuwahata
Summary: This study investigates virus detection methods based on the nonlinear magnetic response of magnetic nanoparticles, and the widely used magnetic detection methods using the third harmonic due to their high sensitivity and short measurement time. The paper proposes a virus detection method based on the second harmonic signal, which has a larger signal component. It is found that the second harmonic signal is superior to the third harmonic signal for small nanobeads, and it shows a large change in the signal-to-noise ratio (SNR) with nanobeads concentration. Additionally, a virus detection limit of 100 pg/ml is achieved. Therefore, the proposed method has the potential to be used for rapid screening of viruses.
Article
Physics, Applied
Ryota Katsumi, Kosuke Takada, Shun Naruse, Kenta Kawai, Daichi Sato, Takeshi Hizawa, Takashi Yatsui
Summary: Incorporating color centers in diamond with mature integrated photonics using hybrid integration techniques provides a promising approach for scalable quantum applications. By pick-flip-and-place approach, diamond nanostructures can be deterministically integrated on chip with a flat diamond-chip interface. This approach also facilitates diamond nanofabrication and enables the diamond nanobeam to function as a nanoscale quantum sensor.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Kenji Iida, Takashi Takeuchi, Ryota Katsumi, Takashi Yatsui
Summary: We performed first-principles calculations to investigate the optical response of an Au147azobenzene complex and found that the interfacial contact between Au147 and azobenzene plays a significant role in modulating the optical properties of azobenzene. The absorption of isolated azobenzene weakens with an increase in the Au147-azobenzene interaction, while the absorption measured with light field along the Au147-azobenzene alignment strengthens. The charge-transfer excitation mechanism between Au147 and azobenzene also changes remarkably depending on the strength of the interfacial interaction.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
