Article
Engineering, Electrical & Electronic
Sudem Daimary, Priyanka Chetri, Jay Chandra Dhar
Summary: This article introduces a UV-A photodetector based on axial n-ZnO/p-CuO heterostructure nanowires array fabricated using GLAD technique. The photodetector exhibits high rectification ratio, low dark current, and fast photoresponse, and shows high detectivity and low noise equivalent power.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Sudem Daimary, Jay Chandra Dhar
Summary: In this study, a photodetector based on axial n-ZnO/p-CuO heterostructure nanowires was fabricated on Si substrate using the glancing angle deposition technique. SEM and TEM images confirmed the formation of well-aligned and vertical nanowire structure, and increased photo-absorption was observed. XPS analysis showed no deviation in electronic state after the formation of the heterostructure. The resulting PD exhibited a high rectification ratio, low dark current, and ultrafast photoresponse.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Physics, Multidisciplinary
Ali Orkun Cagirtekin, Ahmad Ajjaq, Ozlem Barin, Selim Acar
Summary: This study investigated the effect of coating p-Si substrates with a pure ZnO layer on the dielectric parameters. The dielectric constant and AC electrical conductivity increased with increasing frequency and temperature. Peaks were observed in the electrical modulus and shifted to the high-frequency region with increasing temperature. The activation energies decreased as the frequency increased. The fabricated diode showed higher dielectric loss compared to its dielectric constant, which could be advantageous for heating or electromagnetic absorption applications.
Article
Chemistry, Physical
Lekgolo M. Maebana, Rapelang G. Motsoeneng, Zamaswazi P. Tshabalala, Hendrik C. Swart, Franscious R. Cummings, Mudalo Jozela, Steven S. Nkosi, David E. Motaung
Summary: CuO-ZnO heterostructures containing different concentrations of Zn were synthesized via hydrothermal synthesis and used for xylene vapor detection. The sensor showed excellent selectivity, stability, and sensitivity towards xylene vapor, with a low detection limit of 9.5 ppb and a sensitivity of 0.063 ppm-1. The superior gas sensing characteristics of the CuO-ZnO heterostructure can be attributed to its large surface area, the creation of a p-n heterojunction, and the strong chemical affinity and catalytic performance of p-type CuO towards xylene vapor. The response mechanism to xylene was also clarified.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
O. Kahveci, A. Akkaya, E. Yucel, R. Aydin, B. Sahin
Summary: This study attempts to synthesize nanostructured p-type CuO and n-type ZnO nanocomposite films using a solution-based method. Bare and Cobalt (Co)-doped CuO-ZnO nanocomposite films were produced on glass slides using the SILAR method, and the influence of Co-doping concentration on the physical characteristics of the films was investigated. XRD spectrums confirmed the phase and structural purity of the synthesized CuO-ZnO nanocomposite samples. The surface topography, optical and electrical properties of the films were also examined. The 2.0% Co-doped CuO-ZnO nanocomposite film showed a higher optical transmission (-31%) near 1000 nm wavelength compared to the bare film (-38%). The sheet resistance of the 2.0% Co:CuO-ZnO nanocomposite sample was almost 13 times lower than that of the bare sample at 400 K temperature. This study provides a novel strategy for the production and performance optimization of CuO-ZnO nanocomposite heterostructures in optoelectronics applications.
CERAMICS INTERNATIONAL
(2023)
Article
Green & Sustainable Science & Technology
Thi Nghi Nhan Nguyen, Kao-Shuo Chang
Summary: This paper reports a facile hydrothermal method for fabricating p-BiFeO3 (BFO)-n-ZnO composite films on tin-doped indium oxide substrates, and tuning various functional properties of single-crystalline BFO and ZnO to enhance piezoelectricity for multiapplications.
Article
Chemistry, Physical
Nitesh Dogra, Paras Agrawal, Sachin Pathak, Rajan Saini, Sandeep Sharma
Summary: Efficient hydrogen evolution reaction is vital for sustainable energy, and non-metal catalysts are needed to replace expensive catalysts. However, the catalytic activity of nanosheets is limited due to agglomeration and low conductivity. Composites with low dimensional materials have shown enhanced performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
R. Szymon, E. Zielony, A. Lysak, M. A. Pietrzyk
Summary: In this study, a pair of heterojunctions with different types of interlayer, n-ZnO/ZnCdO and n-ZnCdO/ZnO, were grown and investigated. The electrical properties and parameters of these heterojunctions were characterized using current-voltage (I-V) characteristics and capacitance-voltage characteristics. Different carrier transport mechanisms were observed, including tunneling, multi-tunneling capture-emission, and space-charge limited currents. Defects in the junctions were characterized using deep level transient spectroscopy, and the influence of cadmium ions in the ZnCdO interlayer on trap levels was observed. The interlayer type was found to affect junction parameters and current transport mechanisms. (c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Minjie Liu, Rumin Liu, Tao Yu, Wenyi Shao, Weiyong Yuan, Jianguo Lu
Summary: This study designed p-n heterojunctions in CuO/ZnO nano-hybrids, demonstrating remarkable antibacterial efficiency against Escherichia coli and Staphylococcus aureus. The formation of p-n heterojunctions elevated the generation of reactive oxygen species, which is responsible for the enhanced antibacterial behaviors. This research provides new insights for the development of high-efficient, broad-spectrum antibacterial materials for practical applications.
Article
Chemistry, Physical
Sikai Zhao, Yanbai Shen, Fulai Hao, Changke Kang, Baoyu Cui, Dezhou Wei, Fanli Meng
Summary: CuO-ZnO p-n junctions were constructed by precipitating CuO nanoparticles on the surface of ZnO nanowires, resulting in an enhancement of gas sensing performance, specifically in ethanol sensing. The distinct sensing behaviors of the sensors were discussed in relation to several factors and considerations.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Amar L. Jadhav, Sharad L. Jadhav, Bhalchandra K. Mandlekar, Anamika V. Kadam
Summary: Copper oxide exhibits excellent properties for charge storage supercapacitor applications, particularly in the form of flower-like three-dimensional hierarchical structures. The binder-free flower-like 3Dh-CuO nanomaterials demonstrate high specific capacitance and energy density, along with good cycling stability.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Ceramics
Nurliyana Mohamad Arifin, Fariza Mohamad, Rosniza Hussin, Anis Zafirah Mohd Ismail, Shazleen Ahmad Ramli, Norazlina Ahmad, Nik Hisyamudin Muhd Nor, Mohd Zainizan Sahdan, Mohd Zamzuri Mohammad Zain, Masanobu Izaki
Summary: Metal oxide semiconductor materials have shown great potential in heterojunction thin film fabrication for photovoltaic mechanism improvements. The development of a p-(111)-Cu2O heterostructure with a uniform and highly oriented n-TiO2/(002)-ZnO bilayer thin film successfully addressed electron mobility issues. By utilizing sol-gel spin coating method to deposit the n-TiO2/ZnO bilayer as a window layer, improvements in crystalline size and transmission spectrum were achieved.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Surangkana Wannapop, Anuwat Khawsaad, Apisit Supanpong, Yupin Janorat, Yaowamarn Chuminjak, Adisorn Tuantranont, Anukorn Phuruangrat, Titipun Thongtem, Somchai Thongtem, Asanee Somdee
Summary: In this study, the role of p-n junction in the photocatalytic degradation of dye-contaminated wastewater was investigated by synthesizing n-type ZnO enhanced with metal oxides like CuO, NiO, and Fe2O3. The performance of CuO/ZnO and NiO/ZnO materials was found to be better compared to pure ZnO, while Fe2O3/ZnO exhibited decreased photocatalytic activity. Ni(5)-ZnO showed the highest performance, degrading dyes by over 99.71% in contaminated water.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Physics, Condensed Matter
Hogyoung Kim, Myeong Jun Jung, Byung Joon Choi
Summary: The ALD growth of ZnO on n-SiC/p-Si heterojunction was investigated, and the current transport mechanism was analyzed, showing different I-V characteristics and activation energies for reverse currents. The C-V characteristics revealed a higher interface state density for n-ZnO/n-SiC/p-Si heterojunction.
SOLID STATE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Soraya Bouachma, Katia Ayouz-Chebout, Mouhamed Kechouane, Amar Manseri, Chafiaa Yaddadene, Hamid Menari, Noureddine Gabouze
Summary: A n(+)-PSi/p-CuO/n-Cu2O bilayered heterostructure has been fabricated and tested for its performance in a CO2 gas environment. The results showed that the bilayer structure has high sensitivity and fast response time at low bias potential.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Physical
F. A. Hezam, O. Nur, M. A. Mustafa
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2020)
Article
Physics, Condensed Matter
Sadia Muniza Faraz, Wakeel Shah, Naveed Ul Hassan Alvi, Omer Nur, Qamar Ul Wahab
ADVANCES IN CONDENSED MATTER PHYSICS
(2020)
Article
Construction & Building Technology
Dalia Ahmed Mohammed Osman, Omer Nur, Mustafa Abbas Mustafa
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2020)
Article
Chemistry, Inorganic & Nuclear
Aneela Tahira, Zafar Hussain Ibupoto, Ayman Nafady, Magnus Willander, Omer Nur
Summary: In this study, an efficient Co3O4/ZnO based composite was prepared for photoelectrochemical water splitting using a low temperature aqueous chemical growth method. The composite showed superior performance due to significant increase in photocurrent density, promotion of electron-hole charge carrier separation, and favorable charge transport. Additionally, electrochemical impedance spectroscopy revealed a small charge transfer resistance for the composite material, leading to robust water splitting. The prepared composite is earth abundant, inexpensive, and scalable, making it suitable for diverse applications.
JOURNAL OF CLUSTER SCIENCE
(2022)
Correction
Chemistry, Analytical
Mushtaque Hussain, Zafar Hussain Ibupoto, Mazhar Ali Abbasi, Omer Nur, Magnus Willander
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Correction
Chemistry, Inorganic & Nuclear
Elfatih Mustafa, Aneela Tahira, Rania E. Adam, Zafar Hussain Ibupoto, Sami Elhag, Magnus Willander, Omer Nur
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
F. A. Hezam, Nodar O. Khalifa, O. Nur, M. A. Mustafa
Summary: This study reported the structural and magnetic properties of Ni0.5Mg Zn0.5-xFe2O4 nanocrystalline ferrites synthesized via the co-precipitation method. The ferrites exhibited superparamagnetic behavior and were found to be sensitive to the Mg2+ and Zn2+ contents.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Sadia Muniza Faraz, Syed Riaz un Nabi Jafri, Zarreen Tajvar, Naveed ul Hassan Alvi, Qamar-ul-Wahab, Omer Nur
Summary: The study investigated the effect of thermal annealing atmosphere on the electrical characteristics of Zinc oxide nanorods/p-Silicon diodes, revealing improvements in rectifying behavior, ideality factor, carrier concentration, and series resistance after annealing, particularly in Oxygen atmosphere. The research suggests that by controlling the annealing temperatures and atmospheres of ZnO nanorods, the electronic and optoelectronic properties of ZnO devices can be enhanced.
ELEKTRONIKA IR ELEKTROTECHNIKA
(2021)
Article
Nanoscience & Nanotechnology
Ebrahim Chalangar, Elfatih Mustafa, Omer Nur, Magnus Willander, Hakan Pettersson
Summary: In this study, a new low-cost template-assisted synthesis method was used to fabricate vertically aligned ZnO nanorod arrays on Si (100). The nanorods were grown on a double seed layer composed of reduced graphene oxide (rGO) and Al-doped ZnO nanoparticles. The seed layer was prepared by spray-coating the substrate with graphene and dip-coating it into an Al-doped ZnO sol-gel solution. A growth template was created using a double-layer resist spin-coated on top of the rGO/ZnO:Al seed layer and patterned by colloidal lithography. The results showed successful chemical bath deposition of ZnO nanorods with controllable diameter and density in the nanoholes of the patterned resist mask. Our novel method has the potential to fabricate electronic devices on various smooth substrates with a short thermal budget and the seed layer acting as a conductive strain-relieving back contact. The top contact can be easily made by depositing a suitable transparent conductive oxide or metal, depending on the specific application.
Article
Chemistry, Multidisciplinary
E. Mustafa, E. A. Dawi, Z. H. Ibupoto, A. M. M. Ibrahim, A. Elsukova, X. Liu, A. Tahira, R. E. Adam, M. Willander, O. Nur
Summary: Water splitting energy production relies on high-performance PECs, and CuO is considered an excellent photocathode material. By incorporating Ag2WO4 nanoparticles onto CuO nanoleaves using SILAR, a CuO/Ag2WO4 composite with outstanding performance in the PEC water splitting process is developed. Factors such as surface active sites, charge separation rate, surface defects, and CuO and Ag2WO4 interaction contribute to the performance of the composite.
Article
Chemistry, Analytical
Nasrin Razmi, Mohammad Hasanzadeh, Magnus Willander, Omer Nur
Summary: This article reports a simple and sensitive electrochemical DNA biosensor for the rapid and accurate detection of E. coli O157:H7 in river water. The sensor exhibited high selectivity and sensitivity, and was able to detect very low concentrations of E. coli O157:H7 in water samples.
ANALYTICAL METHODS
(2022)
Article
Nanoscience & Nanotechnology
Elfatih Mustafa, Rania E. Adam, Polla Rouf, Magnus Willander, Omer Nur
Summary: This study demonstrates the enhanced photoelectrochemical performance of ZnO/Ag2WO4/AgBr heterojunction nanorods compared to pure ZnO nanorods. The improved photocatalysis is attributed to enhanced photogeneration and electron transportation in the heterojunction, highlighting the synergistic effect of the heterostructure. This research provides valuable insights into the photocatalytic mechanism of heterojunctions and paves the way for the development of novel and efficient photoelectrochemical-catalytic materials.
NANOSCALE RESEARCH LETTERS
(2021)
Article
Physics, Multidisciplinary
Sadia Muniza Faraz, Syed Riaz Un Nabi Jafri, Hashim Raza Khan, Wakeel Shah, Naveed ul Hassan Alvi, Qamar ul Wahab, Omer Nur
Summary: The electrical properties of heterojunction diodes (HJDs) made from zinc oxide (ZnO) nanorods are investigated after post-growth annealing treatment. The diodes annealed at 400 degrees Celsius show improved behavior compared to those annealed at 600 degrees Celsius.
Review
Chemistry, Multidisciplinary
Peng Si, Nasrin Razmi, Omer Nur, Shipra Solanki, Chandra Mouli Pandey, Rajinder K. Gupta, Bansi D. Malhotra, Magnus Willander, Adam de la Zerda
Summary: Gold nanoparticles exhibit unique optical properties that can enhance biosensing and bioimaging technologies. Recent advances in utilizing AuNPs for optical biosensors and biomedical imaging are discussed, highlighting their fabrication methods, applications, and future trends as well as challenges in implementing these technologies in clinical investigations.
NANOSCALE ADVANCES
(2021)
Article
Nanoscience & Nanotechnology
Ebrahim Chalangar, Omer Nur, Magnus Willander, Anders Gustafsson, Hakan Pettersson
Summary: This study successfully grows vertically aligned ZnO nanorods with controllable diameter and density using colloidal lithography. The method can be used for fabricating optimized devices.
NANOSCALE RESEARCH LETTERS
(2021)
