Article
Nanoscience & Nanotechnology
P. Abhijith, Abin Tom, Kusuma Urs, K. N. Prajapati, S. Sajana, J. Mitra, Deepshikha Jaiswal-Nagar, Vinayak B. Kamble
Summary: In this paper, the frequency-dependent gas sensor response of ZnO nanoparticles is studied, showing that synthesis temperature can affect the grain boundaries and transport mechanism, leading to changes in impedance and resonance frequency. The frequency-dependent response provides a detailed investigation of the gas sensing mechanism in ZnO.
Article
Nanoscience & Nanotechnology
Peter M. Wojcik, Lyndon D. Bastatas, Negar Rajabi, Pavel Bakharev, David N. McIlroy
Summary: This study investigates the electrical and optoelectronic properties of nanometer-sized ZnO structures, highlighting the significant influence of native point defects on these properties. By fabricating an electronic device to characterize the ZnO layer, it is found that the energy of excitation sources and the trapping of electrons and holes in defect levels within the bandgap have a major impact on the photocurrent characteristics. The paper provides physical models to describe the behavior of photocurrent under different excitation sources and proposes a phenomenological model to explain the dependence of saturation photocurrent on excitation intensity.
Article
Nanoscience & Nanotechnology
Longqing Mi, Zanhong Deng, Junqing Chang, Meng Li, Ruofan Zhang, Shimao Wang, Libing You, Xiaodong Fang, Yong He, Gang Meng
Summary: We demonstrated that the humidity tolerance of a ZnO chemiresistor can be significantly improved by H2O2 treatment. The H2O2-treated ZnO chemiresistor shows stable operation under a highly humid air background and the response to O3 can be further enhanced by pulsed UV light modulation.
ACS APPLIED NANO MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Mengya Guo, James T. Brewster II, Huacheng Zhang, Yuxin Zhao, Yanli Zhao
Summary: This review focuses on recent developments and challenges of MEMS-based micro-and nanoscale gas sensors, as well as future trends in this field. It also covers the background, seminal efforts, current applications, challenges, and opportunities for next-generation systems.
Article
Engineering, Electrical & Electronic
Tonglei Cheng, Fan Zhang, Bin Li, Wei Liu, Xiaoyu Chen, Yuanhongliu Gao, Xin Yan, Xuenan Zhang, Fang Wang, Takenobu Suzuki, Yasutake Ohishi
Summary: A Sagnac interferometer based optical fiber ultraviolet (UV) sensor utilizing ZnO film to convert UV irradiance changes to interference spectrum wavelength shifts has been proposed. The sensor showed competitive sensitivity, high linearity, satisfactory repeatability, and stability.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Sonia Freddi, Miriam C. Rodriguez Gonzalez, Pilar Carro, Luigi Sangaletti, Steven De Feyter
Summary: In this study, functionalized graphene gas sensors for ammonia detection were developed. The sensing capability of the covalently modified graphene layers was proven superior, and the sensor's response to ammonia was defect-driven, as revealed by theoretical calculations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Guohua Dong, Yue Hu, Changqing Guo, Haijun Wu, Haixia Liu, Ruobo Peng, Dan Xian, Qi Mao, Yongqi Dong, Yanan Zhao, Bin Peng, Zhiguang Wang, Zhongqiang Hu, Junwei Zhang, Xueyun Wang, Jiawang Hong, Zhenlin Luo, Wei Ren, Zuo-Guang Ye, Zhuangde Jiang, Ziyao Zhou, Houbing Huang, Yong Peng, Ming Liu
Summary: This study presents a method for preparing self-assembled, epitaxial, ferroelectric nanosprings and demonstrates their super-scalability and full recovery capability.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Analytical
Ruud Peters, Niels Beijer, Bauke van't Hul, Brigitte Bruijns, Sandra Munniks, Jaap Knotter
Summary: A hand-held, carbon-nanotube-based electronic nose has been introduced to the market. It has potential applications in various industries but its performance has not been well-studied. In a series of measurements, the instrument was tested with low ppm vapor concentrations of four volatile organic compounds. The results show detection limits, linear signal response, repeatability, reproducibility, and scent patterns, indicating the need for future improvements.
Article
Chemistry, Multidisciplinary
Mei Chen, Yiqi Fan, Hongfang Zhou, Guoneng Li
Summary: A stable and directional Li metal battery with controlled growth is achieved by using a functional ZnO@C/cellulose membrane as a separator. The cycling stability and lifespan of Li metal batteries are significantly improved by controlling the growth direction and enhancing the reversibility.
Article
Chemistry, Physical
Kun Cai, Xin Li, Jiao Shi, Qing-Hua Qin
Summary: In this study, a novel torque nanospring model constructed from hydrogenated graphene ribbons (H1GRs) was proposed and its shrinking characteristics were investigated through molecular dynamics simulations. It was found that the internal tension of the nanospring remains at a certain level, even after randomly removing a percentage of C-H bonds. This suggests potential applications in actuators, nanobalance, switches, and more.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Analytical
Aqsa Munawar, Farhan Zafar, Saadat Majeed, Masooma Irfan, Hidayat Ullah Khan, Ghazala Yasmin, Naeem Akhtar
Summary: A novel sensing platform based on NC@ZnO was developed for precise monitoring of dopamine. The material was characterized through SEM, TEM, XPS, and Raman spectroscopy, demonstrating the successful application of the enhanced ECL intensity system for dopamine detection.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Deep Chandra Upadhyay, Satyabrata Jit
Summary: This letter presents a metal-semiconductor-metal dual band photodetector with an interdigitated electrode structure of silver on CdSe nanocrystals-coated ZnO structure. The device exhibits dual-wavelength detection property with high responsivities and detectivities at 380 nm and 540 nm, under low bias voltages. The transient characteristics analysis reveals fast rise and fall times for both UV and visible light.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Nanoscience & Nanotechnology
Hendrik Schlicke, Sophia C. Bittinger, Heshmat Noei, Tobias Vossmeyer
Summary: The study shows that the response kinetics of sensors to VOCs can be tuned by adjusting the sensor's structure and exposure. Response times are influenced by the molecular volume of the analyte, while maximum sensor response is affected by the analytes' polarity and vapor pressure. Linear discriminant analysis can differentiate between similar analytes based on response features.
ACS APPLIED NANO MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Shashi Pandey, Alok Shukla, Anurag Tripathi
Summary: Spin coating and hydrothermal method were used to fabricate ZnO nanorods (NRs) coated with thin layers of TiO2 (ZnO@TiO2 NRs). SEM and X-ray diffraction analysis confirmed the morphology and structural stability of the prepared NRs. The optical band gaps of the NRs were estimated, showing a blue-shift towards the UV region. TiO2 coated ZnO NRs exhibited enhanced photocurrent and improved responsivity and detectivity in the UV region compared to bare ZnO NRs. Theoretical calculations using density-functional theory were performed to understand the electronic and optical properties of TiO2 coated ZnO heterostructure NRs.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Review
Chemistry, Multidisciplinary
Sonia Freddi, Luigi Sangaletti
Summary: Breath analysis has great potential in medical care and diagnosis, and the development of electronic noses based on carbon nanotubes has attracted research community's interest. This review summarizes the available literature on CNTs-based electronic noses for breath analysis applications, including the functionalization procedure for sensor preparation, breath sampling techniques, statistical analysis methods, diseases under investigation, and the population studied. The review is divided into two main sections, one focusing on e-noses completely based on CNTs, and the other reporting on e-noses with sensors based on CNTs and other materials.
Article
Chemistry, Multidisciplinary
Duncan Merchan-Breuer, Ethan Murphy, Benjamin Berka, Elena Echeverria, David N. McIlroy, Wilson Merchan-Merchan
Summary: This study reports the rapid synthesis of hydrophobic carbon layers on stainless-steel substrates using vaporized biodiesel as fuel. The method involves generating a hydrophobic monolayer on the metal substrate surface in a flame, resulting in unique hierarchical surface structure. The hydrophobicity and wettability properties of the carbon deposits were quantified and studied through contact angle measurements and water droplet drop tests.
Article
Nanoscience & Nanotechnology
Peter M. Wojcik, Lyndon D. Bastatas, Negar Rajabi, Pavel Bakharev, David N. McIlroy
Summary: This study investigates the electrical and optoelectronic properties of nanometer-sized ZnO structures, highlighting the significant influence of native point defects on these properties. By fabricating an electronic device to characterize the ZnO layer, it is found that the energy of excitation sources and the trapping of electrons and holes in defect levels within the bandgap have a major impact on the photocurrent characteristics. The paper provides physical models to describe the behavior of photocurrent under different excitation sources and proposes a phenomenological model to explain the dependence of saturation photocurrent on excitation intensity.
Article
Energy & Fuels
Kailash Hamal, Jeremy May, Dipak Koirala, Haoyu Zhu, Humayun Kabir, Elena Echeverria, David N. McIlroy, Nolan Nicholas, I. Francis Cheng
Summary: Recent advancements have led to the development of a high-performance, stable oxygen reduction reaction electrocatalyst using a simple nitrogen-doping method, which exhibits exceptional performance in electrochemical tests. It not only has strong performance and durability, but also low synthesis cost, potentially overcoming the limitations of catalyst technology in fuel cells.
Article
Physics, Applied
Punya Mainali, Lyndon D. Bastatas, Elena Echeverria, Phadindra Wagle, Prasanna Sankaran, D. N. Mcilroy
Summary: The resistive switching ZnO n-n homojunction diode fabricated with a stack of two dissimilar ZnO thin films shows promising characteristics for addressing the crosstalk problem in a crossbar memory array. The device exhibits a characteristic I-V-hysteresis loop and the maximum ratio of high resistive state to low resistive state occurs at 1 kHz ac signal at 3 V.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Ethan P. Kamphaus, Nannan Shan, Jessica Catharine Jones, Alex B. F. Martinson, Lei Cheng
Summary: The feasibility of a site-selective hydration strategy for site-selective atomic layer deposition (ALD) on rutile TiO2 facets and step edges is investigated. First-principles simulations are used to evaluate the viability of selective hydroxylation on specific step edges. The study also explores the compatibility of three metalorganic ALD precursors with the selective hydration strategy. Experimental evidence for delayed nucleation of ALD on rutile TiO2 single crystals supports the predictions and suggests the possibility of site-selective ALD.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Ludovic Pauchard, Frederique Giorgiutti-Dauphine, David McIlroy
Summary: The study shows that nanostructured films exhibit remarkable mechanical behavior. When unloaded, the cracks in these films can partially close, thanks to the high compliance of the material, low energy consumed by plasticity, and high deformability of the film components.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Computer Science, Hardware & Architecture
Peter Jamieson, Donald Blank, Janelle Ghanem, Tyler McGrew, Giancarlo Corti
Summary: This work presents an industrial system controlled by FPGA, converting LD control from PLC to Verilog HDL for cost reduction and other potential advantages.
INTERNATIONAL JOURNAL OF RECONFIGURABLE COMPUTING
(2022)
Article
Chemistry, Physical
Nannan Shan, Jessica Catharine Jones, Chunxin Luo, Adam S. Hock, Alex B. F. Martinson, Lei Cheng
Summary: Selective hydroxylation approach may be a viable route to site-selective ALD on In2O3, as predicted and supported by experimental results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Polymer Science
Sharmad Joshi, Enrique Gazmin, Jayden Glover, Nathan Weeks, Fazeel Khan, Scott Iacono, Giancarlo Corti
Summary: This paper discusses the necessary steps for manufacturing a 3D printed piezo sensitive sensor using PVDF with a higher beta-phase content. The influence of AM process variables and ZnO nanofiller on the crystallinity, viscosity, and electromechanical properties of PVDF is explored. The results show that using a high cooling rate and adding 10% ZnO nanofiller can enhance the elastic modulus and voltage output of PVDF.
Article
Chemistry, Physical
Ethan P. Kamphaus, Jessica Catharine Jones, Nannan Shan, Alex B. F. Martinson, Lei Cheng
Summary: Routes to area and site-selective atomic layer deposition (ALD) are challenging. This study computationally identifies conditions for site-selective ALD by hydrating surface defects and demonstrates the mechanistically clear path to site-selective ALD through in situ ellipsometric measurements.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Jessica C. Jones, Ethan P. Kamphaus, Jeffrey R. Guest, Anil U. Mane, Lei Cheng, Alex B. F. Martinson
Summary: Unique atomic arrangements on material surfaces can exhibit distinct reactivity, providing opportunities for selective surface chemistry. However, site-selective atomic layer deposition (ALD) processes have not been widely achieved experimentally. This study presents evidence for site-selective ALD targeting oxygen vacancies on TiO2 single crystals. In situ ellipsometry and atomic force microscopy (AFM) imaging confirm the site-specific growth mechanism dependent on surface oxygen vacancy density. This approach may offer future opportunities for targeted remediation of electronically imperfect interfaces.
CHEMISTRY OF MATERIALS
(2023)
Article
Energy & Fuels
Anil Ronte, Phadindra Wagle, Ghader Mahmodi, Mounika Chevula, Shailesh Dangwal, Mohammad Reza Saeb, Jong Suk Lee, David N. Mcllroy, Seok-Jhin Kim
Summary: A thin ZIF-8 membrane was successfully synthesized using an effective vapor-phase technique, which involved converting a ZnO layer to ZIF-8. This membrane exhibited high selectivity and permeability for propylene/propane separation.
Article
Engineering, Chemical
Jeremy May, Dipak Koirala, Forrest Dalbec, Joshua Russell, Hui Xiong, Elena Echeverria, David N. McIlroy, I. Francis Cheng
Summary: Electrochemical oxidation of GUITAR creates a superhydrophilic surface with heightened resistance to fouling, making it suitable for a variety of applications.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Jessica C. Jones, Nazar Delegan, F. Joseph Heremans, Alex B. F. Martinson
Summary: In this paper, we developed a precise control of surface termination and interfacial interactions using atomic layer deposition (ALD) technique on diamond surface, which is critical for advanced solid-state quantum applications. The effect of morphology on ALD nucleation was studied by selecting diamond substrates with smooth and rough surfaces. In situ spectroscopic ellipsometry with sub-angstrom resolution was used to monitor the surface reaction and evaluate the nucleation of an ALD Al2O3 process. Hydrogen termination effectively passivated both smooth and rough surfaces, while triacid cleaning only passivated smooth surface with striking effectiveness.
Article
Chemistry, Multidisciplinary
Ravi Teja Addanki Tirumala, Nishan Khatri, Sundaram Bhardwaj Ramakrishnan, Farshid Mohammadparast, Mohd Tauhid Khan, Susheng Tan, Phadindra Wagle, Sharad Puri, David N. McIlroy, Ali Kaan Kalkan, Marimuthu Andiappan
Summary: Controlling and tuning activity and selectivity in catalysis are crucial for energy-efficient and environmentally friendly catalytic processes. Plasmonic and dielectric Mie resonance-mediated photocatalyses have shown promise in this regard, although reports on tunable product selectivity are limited. Distinguishing the desired Mie resonance-mediated effects from the undesired light-induced heating effect is a major challenge.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
