Article
Nanoscience & Nanotechnology
Xinfeng Chen, Yuan Yu, Chenxiao Yang, Jinlin Yin, Xueling Song, Junjie Li, Honghan Fei
Summary: The study presents a lead chloride-based metal-organic framework with high porosity and stability, showing promising photoluminescent characteristics for sensitive and selective fluorescence detection of NH3. The MOF demonstrated an extremely low limit of detection for NH3 and a portable on-site smart NH3 detector was designed based on it, effectively monitoring NH3 concentrations in different industrial sites.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Optics
Shahad S. Khudiar, Uday M. Nayef, Falah A-H Mutlak, Sarah K. Abdulridha
Summary: ZnO nanostructures are effective materials for gas sensors, especially for NO2 gas sensors. This review article explores the advances in NO2 gas sensors based on ZnO nanoparticles, including surface morphology analysis, optical characteristics study, and electrical property measurements. Adjusting the operating temperature of the sensor can significantly impact its sensitivity, recovery time, and response time.
Article
Nanoscience & Nanotechnology
Lekshmi A. Kurup, Cameron M. Cole, Joshua N. Arthur, Soniya D. Yambem
Summary: The development of capacitive flexible pressure sensors using graphene-based conductive foams showed high sensitivity and durability, especially in detecting weak physiological signals within a low pressure range. The porous foams with graphene-coated pores demonstrated the highest sensitivity and showed potential applications in biomedical sensing and wearable devices.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Khawla Azaiez, Rabia Benabderrahmane Zaghouani, Mahmoud Daoudi, Mosbah Amlouk, Wissem Dimassi
Summary: This study focuses on the impact of Bismuth solution treatment on the optical properties of p-type porous silicon. By incorporating Bi layers of variable thickness in porous silicon, the photoluminescence property in the visible region has been improved. This finding could be significant for various optoelectronic applications.
INORGANIC CHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jiarui Huang, Chunyu Meng, Hui Wang, Haibo Ren, Xiaojing Lu, Sang Woo Joo
Summary: In this study, cross-linked porous tin dioxide nanosheets were successfully synthesized using three-dimensional reduced graphene oxide as a template. The resulting nanosheets exhibited high sensitivity to toxic organic vapors, making them promising candidates for practical detectors of volatile organic compounds.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Optics
I. Gavrilchenko, Y. S. Milovanov, S. Gryn, S. A. Alekseev, A. N. Zaderko, A. G. Shkavro, I. I. Ivanov, V. A. Skryshevsky
Summary: In this study, we reported on the structural and photoluminescence properties of porous silicon carbide formed by electro-chemical etching of SiC plate. The photoluminescence spectrum in the visible region was observed and could be fitted with at least three peaks, with the properties discussed in relation to SEM, TEM, and Raman studies. The nature of the peaks were explained by electron-hole recombination, surface defect centers, and SiC nanocrystallites.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Physical
Ali A. Yousif, Husam R. Abed, Alwan M. Alwan
Summary: The work involved the fabrication of macro porous silicon layers using Laser Assisted Etching and studied their morphology, structure, and luminescence characteristics. Analysis revealed that as the etching time increased, the thickness and pore diameter of the silicon layer also increased. Gas sensing experiments showed that the sandwich electrode configuration exhibited higher efficiency and faster responses.
Article
Chemistry, Multidisciplinary
Yushu Wang, Zhesheng Chen, Yan Qu, Mingrui Zhang, Yifeng Ren, Haoying Sun, Yuan Li, Yu Deng, Songlin Li, Yuefeng Nie, Hengyang Xiang, Yaping Wu, Yi Shi, Haibo Zeng, Yufeng Hao
Summary: In a graphene/ZnTe/graphene heterostructure, carriers can be generated in a wide spectrum range and their separation and recombination can be controlled by an electric bias, enabling both photodetection and photoluminescence switching functions.
Article
Engineering, Electrical & Electronic
Vikas Kumar, Rahul Madan, Bajinder Singh, Devendra Mohan
Summary: Pristine zinc oxide (ZnO) and graphene oxide (GO)-based GO/ZnO nanocomposites were prepared for room temperature acetone gas sensors. Structural analysis showed that increasing wt% of GO did not affect the crystal structure of ZnO. The nanocomposites exhibited a hexagonal plate-like structure, with different thicknesses depending on the wt% of GO. Raman spectroscopy confirmed the presence of fundamental bands of ZnO and GO in the nanocomposites.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Ana M. Santiago, Carla I. M. Santos, Leandro M. O. Lourenco, Ines F. A. Mariz, Joao P. C. Tome, Ermelinda Macoas
Summary: Supramolecular hybrids of graphene quantum dots and phthalocyanine dyes were investigated as turn-OFF-ON photoluminescence nanosensors for detecting ds-DNA, showing high sensitivity and selectivity in comparison to other carbon-based nanosensors previously reported for DNA detection.
Article
Materials Science, Multidisciplinary
Kaustav Sen, Deeparati Basu, Syed Minhaz Hossain, Jayoti Das
Summary: An optical calcium sensor was fabricated using calmodulin surface-functionalized macro-porous silicon, showing effective selectivity and multi-parametric optical response for calcium ions. The sensor provides a highly sensitive, easy to use and cost-effective alternative for calcium detection and sensing in drinking water samples and serum.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Song Zhang, Ming Zhang, Chongjie Wang, Pengjian Lu, Bingjian Guo, Bao-Wen Li, Rong Tu, Qingfang Xu, Chuanbin Wang, Lianmeng Zhang
Summary: Micro-supercapacitor (MSC) electrodes made of porous graphene/SiC composite films grown by laser CVD exhibit high specific capacitance and excellent cycling stability. The specific capacitance reaches up to 219.3 mF/cm2, which is 26 times higher than that of electrodes prepared by conventional CVD. After 20000 charge-discharge cycles, the electrode retains 99.9% capacitance at room temperature and 109.6% capacitance at variable temperatures. The abundance of graphene on the SiC porous structure and the strong adhesion between graphene and SiC contribute to the capacitance enhancement and cycling stability.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Multidisciplinary
Lei Wang, Chengbin Li, Shengya Ji, Xiong Peng, Ruyuan Cao
Summary: This study presents a facile method to fabricate wavy graphene mesh (GM)/polydimethylsiloxane composite film for detection of tensile strain and vertical pressure. The wavy film exhibits a broad detection range of strain (0 to 20%), high gauge factor (4.3), and excellent reliability. It also demonstrates the capability to detect vertical pressures in an ultra-broad sensing range of 0 to 1000 kPa with a sensitivity of 2.72 kPa(-1). Sensing demonstrations for vocalization, joint bending, pressing, and walking suggest great potential for full-body motion monitoring.
Article
Chemistry, Physical
Ziwei Liao, Yingyi Ma, Shun Yao, Junming Zhang, Yuhang Han, Kaizheng Xu
Summary: The development of a simple, low-cost, and easy-to-adjust electrochemical sensor for DA detection is of great significance. In this study, the integration of an ordered porous structure with reduced graphene oxide (rGO) was achieved through the breath figure method. The prepared rGO-based porous structure modified electrode exhibited high sensitivity and low detection limit for DA detection, as well as excellent stability and accuracy in real samples.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Lijun You, Xinming Shi, Jing Cheng, Jinhao Yang, Caihua Xiong, Zifeng Ding, Zhijuan Zheng, Shaoyun Wang, Jianhua Wang
Summary: The application of hydrogels in flexible electronics is limited due to the deterioration of mechanical and electrical properties caused by freezing at low temperature and desiccation after long-term use. In this study, a porous organohydrogel with high breathability, conductivity, mechanical flexibility, anti-freezing and long-term stability was prepared using a combined method of biological fermentation and salt-out toughening crosslinking. The sensor fabricated from this porous organohydrogel exhibited excellent sensing sensitivity, fast response ability, and good endurance, making it suitable for monitoring various human activities and serving as a pressure sensor and human-machine interface.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Taha M. Rashid, Uday M. Nayef, Majid S. Jabir
Summary: The pulsed laser ablation technique was used to prepare gold and zinc oxide nanoparticles in two forms: core-shell nanoparticles and a nanocomposite. The core-shell nanoparticles exhibited high photocatalytic activity.
MATERIALS TECHNOLOGY
(2022)
Article
Optics
Shahad S. Khudiar, Uday M. Nayef, Falah A-H Mutlak, Sarah K. Abdulridha
Summary: ZnO nanostructures are effective materials for gas sensors, especially for NO2 gas sensors. This review article explores the advances in NO2 gas sensors based on ZnO nanoparticles, including surface morphology analysis, optical characteristics study, and electrical property measurements. Adjusting the operating temperature of the sensor can significantly impact its sensitivity, recovery time, and response time.
Article
Biochemistry & Molecular Biology
Majid S. Jabir, Taha M. Rashid, Uday M. Nayef, Salim Albukhaty, Faizah A. AlMalki, Jawaher Albaqami, Amal A. AlYamani, Zainab J. Taqi, Ghassan M. Sulaiman
Summary: Nanoparticles composed of gold and zinc oxide can serve as an antibacterial agent by destroying bacterial cells and reducing the adherence and invasion of Staphylococcus aureus. Additionally, these nanoparticles can inhibit the secretion of the alpha-hemolysin toxin produced by S. aureus.
BIOINORGANIC CHEMISTRY AND APPLICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Eman M. Sulaiman, Uday M. Nayef, Falah A-H Mutlak
Summary: Colloidal nanoparticles of Au:Cd were prepared via laser ablation and deposited on porous-Si. The highest responsivity of the Au:Cd NPs/PS photodetector was found to be at a laser energy of 800 mJ/pulse, possibly due to the smaller particle size and larger surface area.
MATERIALS TECHNOLOGY
(2022)
Article
Nuclear Science & Technology
Husam Raed Sabeeh Al-Esaifer, Aliekber Aktag, Uday Muhsin Nayef, Emre Doganci
Summary: This article reports the properties of Gd2O3/(CZ-pSi) diodes under various gamma ray irradiation dose rates. The band gaps of the films were modified by controlling the amount of Gd2O3 during deposition. The current decreases while the capacitance increases with increasing radiation dose. These results are promising for radiation detection applications.
RADIATION EFFECTS AND DEFECTS IN SOLIDS
(2022)
Article
Optics
Uday M. Nayef, Ali J. Hadi, Sarah K. Abdulridha, Falah A-H Mutlak, Ala F. Ahmed
Summary: Spherical tin dioxide nanoparticles were prepared through pulsed laser ablation in liquid mediums, with their size and size dispersion depending on the liquid medium. The shift of the Sn-O band in different liquid mediums can be attributed to the increase in concentration and decrease in size of the SnO2 nanoparticles. The band gap energy of SnO2 nanoparticles is larger compared to bulk SnO2 due to quantum confinement.
JOURNAL OF OPTICS-INDIA
(2023)
Article
Optics
Eman M. Sulaiman, Uday M. Nayef, Falah A. H. Mutlak
Summary: The laser ablation technique was used to synthesize gold:oxide nanocomposites with uniform morphology and good dispersibility. The core:shell Au:CdO nanoparticles were deposited on a porous-Si surface and their characteristics were studied. The synthesized nanoparticles had good structural properties and surface roughness, and could be used for high-sensitivity gas sensors.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Multidisciplinary Sciences
Rana Mahmood, Afraa Ali Kadhim, Sumayah Ibraheem, Salim Albukhaty, Harraa S. Mohammed-Salih, Ruaa H. Abbas, Majid S. Jabir, Mustafa K. A. Mohammed, Uday M. Nayef, Faizah A. AlMalki, Ghassan M. Sulaiman, Hassan Al-Karagoly
Summary: This study investigated a simple bio-synthesis approach for the synthesis of copper oxide nanoparticles (CuO NPs) and tested their anti-cancer effects. The results showed that the synthesized nanoparticles inhibited the proliferation of breast cancer cells while having minimal effect on healthy cells. The nanoparticles were taken up by cancer cells, triggering apoptosis and increasing lactate dehydrogenase production. Therefore, the study suggests that the synthesized CuO NPs have anti-proliferative effects by inducing cell death.
SCIENTIFIC REPORTS
(2022)
Article
Optics
Eman M. Sulaiman, Uday M. Nayef, Falah A-H Mutlak
Summary: This study fabricated Au:MgO nanoparticles on porous silicon substrates using pulsed laser ablation method and investigated their optical characteristics, crystallinity, and surface morphology. The gas sensors fabricated from prepared specimens were evaluated for sensitivity, recovery times, and response to NO2 and H2S gases, showing potential for gas sensing applications.
JOURNAL OF OPTICS-INDIA
(2022)
Article
Optics
Ahmad J. Jwar, Uday M. Nayef, Falah A-H Mutlak
Summary: The aim of this research is to study the effects of an external magnetic field on the properties of Au@TiO2 films and its potential application as a photodetector. The results showed that the morphology, size, and optical energy gap of the Au@TiO2 nanoparticles were affected by the magnetic field, while the structural properties remained unchanged. The study also suggests that Au@TiO2 nanoparticles could be a promising candidate for high-performance photodetector applications.
JOURNAL OF OPTICS-INDIA
(2023)
Article
Optics
Ahmad J. Jwar, Uday M. Nayef, Falah A. H. Mutlak
Summary: The purpose of this study is to investigate the potential of nanostructured Au-TiO2 particles in replacing traditional materials for gas sensing applications. The researchers used a pulsed laser deposition technique to prepare and analyze Au-TiO2 nanoparticles on a Porous Silicon substrate. The findings suggest that the Au-TiO2 nanoparticles play a significant role in developing electrical properties and enhancing sensitivity to H2S and NO2 gases.
JOURNAL OF OPTICS-INDIA
(2022)
Article
Chemistry, Physical
Ahmad J. Jwar, Uday M. Nayef, Falah A. -H. Mutlak
Summary: Gold-Titanium Dioxide nanoparticles (Au-TiO2 NPs) were synthesized using pulsed Nd:YAG laser ablation in the presence of a magnetic field. Various characterization techniques such as SEM, XRD, UV-Vis spectroscopy, and TEM were used to analyze the Au-TiO2 NPs. The addition of a magnetic field resulted in the formation of spherical NPs, reduced particle agglomeration, and decreased particle size. The optical energy gap of Au-TiO2 NPs increased after ablation with a magnetic field.
Article
Materials Science, Multidisciplinary
Muhanad Alhujaily, Majid S. S. Jabir, Uday M. M. Nayef, Taha M. M. Rashid, Ghassan M. M. Sulaiman, Khalil A. A. Khalil, Muntadher I. I. Rahmah, Mazin A. A. Najm, Rihab Jabbar, Sabrean F. F. Jawad
Summary: This study investigates the potential therapeutic, antibacterial, and anticancer properties of a nanocomposite of gold and zinc oxide. The adherence between gold and zinc oxide nanoparticles was analyzed, revealing a core-shell structure. The nanocomposites showed enhanced antibacterial activity against Escherichia coli, as well as cytotoxic effects against breast and esophageal cancer cells. The synthesized nanocomposites could be a promising strategy for biomedical applications.
Article
Optics
Aliyaa A. Urabe, Uday M. Nayef, Randa Kamel
Summary: Palladium (Pd) nanoparticles were prepared using laser ablation and characterized using various techniques. The presence of a magnetic field reduced the average particle size of Pd particles. Gas sensors constructed from the prepared Pd nanoparticles showed varying sensitivity to NO2 and H2S gases at different temperatures. The study also investigated the effect of temperature on reaction time and sensor sensitivity.
JOURNAL OF OPTICS-INDIA
(2023)
Article
Chemistry, Physical
Mariem H. Jasim, Uday M. Nayef, Haitham T. Hussien
Summary: In this study, the properties of a porous silicon photodetector were enhanced by depositing Au@In2O3 nanoparticles on its surface. The resulting device showed high responsivity and quantum efficiency in the visible range.