Article
Physics, Multidisciplinary
Asmaa Al-Rasheedi, M. Khammar, A. M. Abdel-Daiem, M. S. Aida, Mohamed Sh Abdel-wahab
Summary: This paper discusses the growth mechanisms of ZnO nanorods thin-films using the hydrothermal process. The seed layer preparation method alters the alignment of the nanorods, while the nature of the salt source affects the size of the nanorods.
Article
Engineering, Electrical & Electronic
Onur Alev, Imren Erguen, Okan Oezdemir, Leyla Colakerol Arslan, Serkan Bueyuekkoese, Zafer Ziya Ozturk
Summary: Cu-doped ZnO nanorods showed enhanced sensor response towards ethanol and allowed operation at lower temperatures compared to pristine ZnO nanorods, with 2% and 3% Cu-doped sensors exhibiting selective behavior towards ethanol.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Hamid Reza Mazandarani, Bijan Ghafary, Shahab Norouzian Alam
Summary: In this study, n-Type ZnO nanorods were successfully grown on a p-type Si substrate using the hydrothermal technique, and ZnO-based UV photodiodes were fabricated. The structural properties of the ZnO nanorod arrays were found to be influenced by the solution volume in the hydrothermal process, with well-aligned arrays observed on all substrates. Increasing the growth solution volume resulted in higher responsivity of the ZnO-based photodiodes, and the optical properties of the samples were also affected by this volume change.
Article
Chemistry, Inorganic & Nuclear
Asmaa Al-Rasheedi, A. Salwati, Akhalakur Rahman Ansari, Ali Abdel-Daiem Hassaneen, M. S. Aida
Summary: ZnO nanorods were synthesized via the hydrothermal method, and the solution temperature variation caused a change in nanorods morphology. The nanorods prepared at higher temperature exhibited superior photocatalysis activity.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Materials Science, Characterization & Testing
Yijun Fu, Yue Cheng, Chi Chen, Dawei Li, Wei Zhang
Summary: In this study, hydrothermal process was used to synthesize pine-needle-like zinc oxide/polyvinylidene fluoride composite nanofibers, demonstrating promising potential in electromechanical energy conversion applications when ideal microstructure and piezoelectric performance are achieved under carefully controlled reaction conditions.
Article
Thermodynamics
Daniel Karajz, Domonkos Cseh, Bence Parditka, Zoltan Erdelyi, Imre Szilagyi
Summary: This study combines atomic layer deposition with hydrothermal growth to produce different structures of gel-like crystals. The morphology, composition, structure, and optical properties of the samples were investigated to reveal the characteristics and performance of the materials.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Materials Science, Ceramics
Anu Katiyar, Nishant Kumar, R. K. Shukla, Anchal Srivastava
Summary: This study synthesized undoped, doped, and co-doped vertically aligned zinc oxide nanorods (NRs) using a sonicated sol-gel immersion method and investigated the structural, morphological, optical, and photoconductivity properties of NRs with different dopants. The results showed that the incorporation of Fe improved the growth of NRs, while the incorporation of Ag had a detrimental effect. Co-doping enhanced the light harvesting efficiency and reduced the persistent photoconductivity.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Hakan Colak, Ercan Karakose
Summary: The study demonstrated that Gd(III)-doped ZnO nanorods show increased response to CO2 gas with higher doping concentration and temperature, with the optimum operating temperature determined as 200 degrees C. The 3 mol % doped sample exhibited a high sensitivity to CO2 gas, with a response rate of about 85% at this temperature, and maintained response stability against CO2, acetone, and ethanol gases for 30 days.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Suvindraj Rajamanickam, Sabah M. Mohammad, Ibrahim Abdul Razak, A. Muhammad, Shireen Mohammed Abed
Summary: An innovative method of improving ZnO nanorods-based UV photodetectors was developed by depositing Ag micro-flakes on top of Ag-encapsulated Ag-doped ZnO nanorods. The Ag-doped ZnO nanorods were synthesized through a low-cost hydrothermal method and then subjected to photodeposition using AgNO3 solution. The doping process resulted in thinner and shorter ZnO nanorods with improved crystallinity and reduced deep-level emissions. The fabricated UV photodetectors exhibited enhanced sensitivity and gain compared to non-doped ZnO nanorods, but excess doping led to higher dark current and reduced sensitivity. A proposed mechanism identified Ag micro-flakes and Ag-doped ZnO nanorods as the sources of photocurrents.
MATERIALS RESEARCH BULLETIN
(2023)
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
Materials Science, Multidisciplinary
R. Torkamani, B. Aslibeiki, H. Naghshara, M. Darbandi
Summary: In this study, ZnO nanorods were prepared using a hydrothermal method with the c-axis orientation perpendicular to the ITO substrate. The structural and optical properties of the samples were examined under various concentrations and pHs. The results showed that concentration and pH had significant effects on the diameter, length, and orientation of the nanorods. The photoluminescence spectra indicated that the samples had high crystalline quality.
Article
Materials Science, Multidisciplinary
Sulaiman S. A. Al Ghafry, Mohammed Z. Al-Abri, Basim Al Farsi, Faisal Al Marzouqi, Lamia M. Al Farsi, Nur Adilah Roslan, Azzuliani Supangat
Summary: This study successfully synthesized pristine and gallium doped ZnO nanorods using rapid microwave-assisted method, and investigated the effects of different doping levels. The results showed significant changes in the morphology, crystalline size, and surface roughness of the nanorods with Ga doping. The 1% Ga doping sample exhibited significant enhancement in visible light absorption and rapid degradation.
Article
Engineering, Electrical & Electronic
C. Jayakrishnan, S. R. Sheeja, J. Duraimurugan, S. Prabhu, R. Ramesh, G. Suresh Kumar, P. Maadeswaran, Mohd Shkir
Summary: This study synthesized three types of ZnO nanostructures using a hydrothermal method with urea as the surfactant, and found that they could effectively degrade methyl orange dye. The use of urea as a surfactant had a significant impact on the morphology and photocatalytic performance of ZnO nanostructures.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Sheng-Joue Young, Yi-Hsing Liu, Yen-Lin Chu, Jian-Zhi Huang
Summary: In this study, a nonenzymatic glucose sensor based on Au nanoparticles adsorbed on ZnO nanorods was successfully synthesized. The resulting Au/ZnO nanorods exhibited excellent sensitivity and selectivity for glucose detection, with a linear range of 0-8 mM. The sensor also showed good selectivity in the presence of interfering species such as ascorbic acid and uric acid. This nonenzymatic glucose sensor is suitable for glucose detection in human blood samples.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Shiguang Shang, Yunpeng Dong, Wenqian Zhang, Wei Ren
Summary: The study investigates the enhancement of ultraviolet response of zinc oxide nanorods by localized surface plasmon resonance mediated by aluminum nanoparticles. The absorption rates in the UV range and photoluminescence properties were improved without changing the morphology and crystalline structure. The photo-to-dark current ratio, sensitivity, and responsivity of ZnO nanorods with Al NPs were significantly increased.
Article
Chemistry, Multidisciplinary
Xiangchun Meng, Xiao Xiao, Sera Jeon, Dabin Kim, Byung-Joon Park, Young-Jun Kim, Najaf Rubab, SeongMin Kim, Sang-Woo Kim
Summary: A bioadhesive triboelectric nanogenerator (BA-TENG) is designed for instant wound sealing and accelerated wound healing. It is fabricated with biocompatible materials and integrates a flexible TENG as the top layer and bioadhesive as the bottom layer. The BA-TENG can produce stable electricity supply and strong sealing capability, and when driven by ultrasound, it can significantly accelerate wound healing. The E-field generated by BA-TENG promotes cell migration and proliferation.
ADVANCED MATERIALS
(2023)
Article
Engineering, Environmental
Ali Nawaz, Minki Kang, Hyung Wook Choi, Rana Tariq Mehmood Ahmad, Sang -Woo Kim, Dae Ho Yoon
Summary: This study presents a hybrid multimodal nanogenerator (HNG) that combines a triboelectric nanogenerator (TENG), a piezoelectric nano-generator (PENG), and an electromagnetic nanogenerator (EMG) using versatile nanocomposite films. With high output power and low internal electrical impedance, the HNG provides efficient energy harvesting in response to external mechanical forces. The findings hold potential for the commercial application of flexible hybrid nanogenerators.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Puran Pandey, Keshav Thapa, Gunendra Prasad Ojha, Min-Kyu Seo, Ki Hoon Shin, Sang -Woo Kim, Jung Inn Sohn
Summary: In this study, we propose an efficient positive material for triboelectric nanogenerators (PAN@ZIF-8 nanofibers) and demonstrate a self-powered visible light communication system for wireless human-machine interactions, home appliance control, and text messaging.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Dong Su Kim, Ji Hoon Choi, Nishad G. G. Deshpande, Hak Hyeon Lee, Kun Woong Lee, Shin Young Oh, Hyung Koun Cho
Summary: This study investigates the hydration enthalpy difference of cations in an aqueous solution for the chemical self-oxidation process. It demonstrates the synthesis of Cu(OH)(x) nanowires photocathode through alkali cation-engineered chemical self-oxidation, which exhibits high purity and superior photoelectrochemical performance.
Article
Chemistry, Multidisciplinary
Jin-Kyeom Kim, Gi Hyeon Han, Sun-Woo Kim, Hee Jun Kim, Rahul Purbia, Dong-Min Lee, Jong Kyu Kim, Hee Jae Hwang, Hyun-Cheol Song, Dukhyun Choi, Sang-Woo Kim, Zhong Lin Wang, Jeong Min Baik
Summary: In this study, a new strategy was developed to achieve maximum charge density in a high-output triboelectric nanogenerator (TENG). By designing a cationic material structure of SiO2 and MoS2 coated on a Ni-mesh, the new TENG generated significantly higher output power and superior charge density compared to Ni-mesh-based TENGs. The high charge density was attributed to the low work function of MoS2, upward bending of the energy band at the MoS2-SiO2 interface, and the high charge capacity of SiO2. The TENG demonstrated an average output power of 14.75 W m(-2) based on the gear-cam mode.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Cheol Hyoun Ahn, Jeong Jae Kim, Won Seok Yang, Hyung Koun Cho
Summary: Composite synthesis with inorganic fillers is proposed to obtain solid-state electrolytes with high ionic conductivity and long-term stability. Biomolecule-based metal-organic frameworks (bio-MOFs) are introduced as efficient active fillers with abundant functional groups. The bio-MOF fillers show good distribution in the polymer electrolyte matrix, leading to enhanced electrochemical performance.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Zheng-Yang Huo, Yuxin Yang, Jang-Mook Jeong, Xiaoxiong Wang, He Zhang, Mingdeng Wei, Keren Dai, Peixun Xiong, Sang-Woo Kim
Summary: A self-powered water disinfection system, driven by triboelectric nano generators, is presented for efficient water disinfection in rural and disaster-stricken areas lacking power supplies. The system utilizes a flow-driven TENG to generate electricity and a metal-organic framework nanowire array for H2O2 generation and electroporation. The prototype achieves complete disinfection over a wide range of flows with low water flow thresholds, offering promising potential for pathogen control.
Review
Engineering, Environmental
Zhengyang Huo, Young Jun Kim, Yuying Chen, Tianyang Song, Yang Yang, Qingbin Yuan, Sang Woo Kim
Summary: The development of self-powered water purification technologies is essential for ensuring drinking water supply in resource-limited regions. Hybrid energy harvesters, which convert multiple ambient energies simultaneously, show potential in driving self-powered water purification facilities under fluctuating conditions.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ji Sook Yang, Sung Hyeon Jung, Cheol Hyoun Ahn, Won Seok Yang, Jeong Jae Kim, Hyung Koun Cho
Summary: Hybrid InGaZnO (IGZO) phototransistors (Ph-TRs) with zeolitic-imidazolate-framework-67 (ZIF-67) as a photoabsorber demonstrate wide photodetection range, fast response/recovery speed, and high stability without additional gate bias. ZIF-67 absorbs visible light and transfers photoexcited electrons to the IGZO conduction band through a metal-to-metal charge transfer pathway, resulting in significant changes in photocurrent. The fast rise/fall time and repeatable photo-sensing performance under pulsed light-on/off cycles make it promising for real-time detection even at high frequencies.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
In-Yong Suh, Young -Jun Kim, Pin Zhao, Daniel Sanghyun Cho, Minki Kang, Zheng-Yang Huo, Sang-Woo Kim
Summary: Researchers developed a novel microbial-blocking textile that uses triboelectric charges induced by harvesting kinetic energy from human motion. The textile, which has opposite triboelectric properties of the outer and inner layers, achieves efficient airborne pathogen blocking through electrostatic repulsion. This self-powered textile offers a promising method for rapid blocking of airborne pathogens with low pressure loss.
Article
Chemistry, Multidisciplinary
Swagotom Sarker, Ji Hoon Choi, Hak Hyeon Lee, Dong Su Kim, Hyung Koun Cho
Summary: The sluggish oxygen evolution reaction and corrosive chlorine oxidation reaction limit the applications of abundant seawater in electrochemical energy conversion. Therefore, it is essential to develop an efficient anodic reaction alternative suitable for coupling with the cathodic counterpart. The hydrazine oxidation reaction (HzOR) offers a unique pathway to overcome these challenges due to its low thermodynamic oxidation potential.
Article
Chemistry, Multidisciplinary
Cheol Hyoun Ahn, Won Seok Yang, Jeong Jae Kim, Hyung Koun Cho
Summary: This study proposes a new synthesis design approach to control the DP-TiO2@NC architecture, derived from a two-step pyrolysis process, for developing electrodes that meet the requirements of high capacity and high rate capability. By tuning the configuration of mixed ligands, the electronic conductivity of the carbon frameworks can be enhanced, resulting in improved battery performance.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Dong Su Kim, Hee Won Suh, Sung Woon Cho, Shin Young Oh, Hak Hyeon Lee, Kun Woong Lee, Ji Hoon Choi, Hyung Koun Cho
Summary: This paper proposes an electrochemical design for improving the reliability of analog switching in RRAM-based neuromorphic computing by adding a sublayer of ultrafine Cu nanoparticles (U-Cu NPs) to the active Cu2O layer.
MATERIALS HORIZONS
(2023)
Article
Multidisciplinary Sciences
Dong-Min Lee, Minki Kang, Inah Hyun, Byung-Joon Park, Hye Jin Kim, Soo Hyun Nam, Hong-Joon Yoon, Hanjun Ryu, Hyun-moon Park, Byung-Ok Choi, Sang-Woo Kim
Summary: The on-demand bioresorbable neurostimulator powered by biosafe ultrasound is an effective solution for treating compression peripheral nerve injury and hereditary peripheral neuropathy. However, the practical application of bioresorbable electronics is limited by unpredictable device lifetimes.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Chunqing Ma, Yeon-Woo Choi, Donghyeon Kang, Bosung Kim, Seung-Gu Choi, Jin-Wook Lee, Sang-Woo Kim, Nam-Gyu Park
Summary: In this study, a new ionovoltaic effect of 2-dimensional halide perovskite is reported, generating electricity by absorbing moisture between vertically installed electrode structures. The interaction between water molecules and perovskite layers is found to be the key to electricity generation. This ionovoltaic device shows excellent capability in harvesting energy from atmospheric moisture, opening new opportunities for exploring the novel properties of organic-inorganic halide perovskite.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
