Article
Optics
Hosein Ghobadi, Herman L. Offerhaus, Jose A. Alvarez-Chavez, Monica Morales-Masis, Israel De Leon
Summary: Transparent Conducting Oxides (TCOs) in the Epsilon-Near-Zero (ENZ) spectral region exhibit a large and ultrafast intensity-dependent refractive index, which is highly dependent on material properties and measurement conditions. This study demonstrates that extensive nonlinear optical measurements can be avoided by analyzing the material's linear optical response. By considering thickness-dependent material parameters, the impact on absorption and field intensity enhancement under different measurement conditions can be determined, allowing for optimization of the nonlinear response. Experimental measurements of Indium-Zirconium Oxide (IZrO) thin films with varying thicknesses confirm the agreement between experiment and theory, and show that film thickness and excitation angle can be adjusted simultaneously for optimizing the nonlinear optical response, enabling flexible design of highly nonlinear TCO-based optical devices.
Article
Materials Science, Multidisciplinary
Junichi Nomoto, Takashi Koida, Iwao Yamaguchi, Hisao Makino, Yuuki Kitanaka, Tomohiko Nakajima, Tetsuo Tsuchiya
Summary: In this study, a novel Ce and H codoped In2O3 (ICO:H) film was fabricated on flexible polyethylene terephthalate (PET) using excimer laser irradiation. The ICO:H film exhibited ultrahigh electron mobility and low sheet resistance, surpassing the performance of commercially available ITO/PET films. Furthermore, it also maintained higher infrared transparency.
NPG ASIA MATERIALS
(2022)
Review
Optics
Wallace Jaffray, Soham Saha, Vladimir M. Shalaev, Alexandra Boltasseva, Marcello Ferrera
Summary: In recent years, there has been renewed attention in the optics and photonics communities towards transparent conducting oxides (TCOs). TCOs have shown metal-like properties, high optical nonlinearity, and epsilon-near-zero (ENZ) characteristics in the near-infrared spectral range. They have potential applications in transparent electrode fabrication, low-loss plasmonics, and integrated nonlinear optics.
ADVANCES IN OPTICS AND PHOTONICS
(2022)
Article
Chemistry, Physical
Salih Ozbay, Nursev Erdogan, Fuat Erden, Merve Ekmekcioglu, Busra Rakop, Mehtap Ozdemir, Gulnur Aygun, Lutfi Ozyuzer
Summary: ITO, ZTO, AZO, and Ag are commonly used in multilayer thin films of transparent conducting oxide (TCO)/metal/TCO electrodes, with critical knowledge of surface free energy (SFE) being important for designing desirable TCO-based sandwich structures. Contact angle measurements of different liquids were used to evaluate the wettability properties of TCO, Ag interlayer, and TCO/Ag/TCO. The results showed that the SFE components varied depending on the TCO type, the total SFE values of TCO/Ag/TCO films were lower than TCO films, and AZO/Ag adhesion was stronger than other TCO/Ag structures.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Xinyuan Wang, Bin Lu
Summary: Polycrystalline transparent In2O3 semiconductive ceramics were successfully fabricated by oxygen atmosphere sintering for the first time. The addition of silica additive dissolved into the In2O3 lattice to improve optical quality and electrical properties of the ceramics during high-temperature densification process.
SCRIPTA MATERIALIA
(2021)
Review
Biochemistry & Molecular Biology
Hong Yong Sohn, Arun Murali
Summary: This article reviews and summarizes recent work in this laboratory on the synthesis of advanced transparent conducting oxide nanopowders using plasma. The process involves selecting suitable precursors, injecting them into a non-transferred thermal plasma, vaporizing them, and forming nanosized oxide particles through vapor-phase reactions. The thermal plasma process shows great potential as an efficient technique for synthesizing oxide nanopowders.
Article
Chemistry, Physical
Ranveer Singh, Hyunwoo Kang, Heechul Shin, Ji-Yong Park, Hyungtak Seo
Summary: The study investigated the 2DEG phenomenon at the interface of an amorphous-Al2O3-In2O3-amorphous-Al2O3 (AIA) heterostructure on a flexible substrate, showing promising opportunities for flexible oxide electronics. The AIA device exhibited a high stability with outstanding performance, and maintained good flexibility even after bending tests.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Applied
Diego M. Solis, Nader Engheta
Summary: We propose a new type of bilayered silicon-photonics subwavelength device that incorporates an indium tin oxide (ITO) thin film to enhance nonlinearity-assisted and ultrafast nonreciprocal behavior. By optimizing the excitation method and frequency mode, we are able to achieve notable nonreciprocal performance in an ultracompact element. Numerical simulations validate our predictions.
PHYSICAL REVIEW APPLIED
(2022)
Article
Chemistry, Physical
Ke-Ding Li, Po-Wen Chen, Kao-Shuo Chang
Summary: In this study, two different transparent conducting oxides (TCOs), ITO and IZTO, were compared for their transparent conducting films fabrication processes at different temperatures. It was found that IZTO-based ECDs exhibited higher optical transmittance modulation compared to ITO-based ECDs. The investigation also included electrochromic WO3 films deposited on both ITO and IZTO-based ECDs using vacuum cathodic arc plasma (CAP).
Article
Optics
Hao Ma, Yuan'an Zhao, Yuchen Shao, Xiangkun Lin, Dawei Li, Zhaoliang Cao, Yuxin Leng, Jianda Shao
Summary: This study proposed a strategy for determining the fluences required for laser processing TCOs using femtosecond lasers. The modification of ITO films induced by different pulse fluences was investigated, revealing various final micro/nanostructures. The interaction mechanism between femtosecond laser pulses and ITO film was explored, providing insights into potential applications for femtosecond laser processing TCO films.
Article
Physics, Applied
Reiji Okada, Hiroto Isomura, Yoshiki J. Sato, Ryuji Okazaki, Masayuki Inoue, Shinya Yoshioka
Summary: Researchers have fabricated transparent low-layered crystals of a misfit thermoelectric oxide, which exhibite high transparency and low electrical resistivity due to their single-crystalline structure. These materials have a higher figure of merit compared to previous reports and may serve as a unique class of multi-functional transparent thermoelectric oxides.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Takashi Koida, Yuko Ueno
Summary: The study investigates the thermal and damp heat stability characteristics of transparent conductive oxide (TCO) films and finds that different crystal growth methods significantly influence the electrical properties and stability characteristics. It suggests that polycrystalline and solid-phase crystallized films should be appropriately used based on the device manufacturing processes.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Saheer Cheemadan, M. C. Santhosh Kumar
Summary: This study deposited CdO:ZnO composite thin films with varying compositions on glass substrates using RF magnetron sputtering. The optoelectronic characteristics of the films and their dependence on substrate temperature were investigated. The structural, electrical, morphological, and optical properties of the films were analyzed using various techniques. The results showed that all films had an average optical transmittance above 80% in the visible range, regardless of the deposition temperature and composition. The CdO:ZnO (70:30) composite thin films deposited at 200℃ exhibited the lowest electrical resistivity and a high carrier concentration. Increasing the substrate temperature from room temperature to 200℃ resulted in an increase in carrier mobility. The energy band gap values of the films were calculated based on the transmittance spectra.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Zhihao Chen, Yu Chen, Yaodong Wu, Xinxing Zhou, Handong Sun, Tony Low, Hongsheng Chen, Xiao Lin
Summary: The photonic spin Hall effect, which is a manifestation of the spin-orbit interaction of light, can be measured through the transverse shift of photons with opposite spins. However, current methods to generate a large spin Hall effect have limitations, occurring only within a narrow angle range. This study proposes a universal scheme to achieve a wide-angle giant photonic spin Hall effect by utilizing the interface between free space and uniaxial epsilon-near-zero media.
Article
Nanoscience & Nanotechnology
Ruzan Sokhoyan, Prachi Thureja, Jared Sisler, Meir Grajower, Komron Shayegan, Eyal Feigenbaum, Selim Elhadj, Harry A. A. Atwater
Summary: Active metasurfaces at optical frequencies enable dynamic wavefront control of light, and investigating their thermal performance limits is crucial for high-power applications. We experimentally demonstrate that gate-tunable conducting oxide metasurfaces can withstand high power densities without significant changes in their optical response, making them robust for applications such as optical communications and LiDAR.
Article
Environmental Sciences
Irum Shaheen, Khuram Shahzad Ahmad, Camila Zequine, Ram K. Gupta, Andrew G. Thomas, Mohammad Azad Malik
Summary: This study successfully synthesized zinc oxide nanoparticles using organic compounds from Nasturtium officinale leaves via a hydrothermal reaction. The synthesized nanoparticles exhibited excellent electrochemical performance, indicating the significant potential of organic compound-incorporated ZnO NPs for supercapacitors.
ENVIRONMENTAL TECHNOLOGY
(2022)
Article
Energy & Fuels
Jonghyun Choi, Tenzin Ingsel, Dipesh Neupane, Sanjay R. Mishra, Anuj Kumar, Ram K. Gupta
Summary: Metal-organic framework (MOF) derived cobalt oxide and sulfide show potential for high performance energy storage in water electrolyzers and fuel cells, with MOF-Co9S8 exhibiting superior electrocatalytic activity.
JOURNAL OF ENERGY STORAGE
(2022)
Review
Chemistry, Physical
Anuj Kumar, Shumaila Ibraheem, Sajjad Ali, T. Maiyalagan, Muhammad Sufyan Javed, Ram K. Gupta, Ali Saad, Ghulam Yasin
Summary: Due to the hydrophobic nature of the fluorocarbon backbone, Nafion membranes are preferred for high H+ conductivity. However, they are limited by a higher price, pH splitting, and bio-fouling, leading researchers to search for better alternatives. Conducting polymers like polyaniline and polypyrrol can be used as electrolyte membranes for fuel cells, and their conductivity can be enhanced through doping techniques. This review provides a detailed discussion on these conducting polymers and their applications, particularly in composite membranes, and evaluates their effects on methanol crossover, H+-conductivity, gas diffusion, and thermal stability for practical DMFC applications.
SURFACES AND INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
J. Choi, K. Morey, A. Kumar, D. Neupane, S. R. Mishra, F. Perez, R. K. Gupta
Summary: With increasing energy needs and environmental concerns, there is a growing demand for research in developing new materials for energy production and storage. In this study, copper-molybdenum sulfide and phosphide-based nanoarchitectures were successfully synthesized using a hydrothermal strategy. These materials exhibited excellent electrochemical characteristics and showed potential for energy production and storage applications, as well as high performance in supercapacitors.
MATERIALS TODAY CHEMISTRY
(2022)
Review
Chemistry, Inorganic & Nuclear
Vivek Sharma, Dipak Kumar Das, Ram K. Gupta, Ghulam Yasin, Anuj Kumar
Summary: MXenes-based nanomaterials show great potential as efficient and low-cost electrocatalysts for oxygen reduction reaction. Their synthesis strategies, electronic and structural properties, and ORR performance are of significant importance. However, there are still challenges and potential aspects that need further research.
INORGANIC CHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Kelsey Thompson, Anuj Kumar, Dipesh Neupane, Sanjay R. Mishra, Felio Perez, Ram K. Gupta
Summary: Due to the synergistic effect, binary transition metal phosphides CoMoP and NiMoP were successfully synthesized on Ni-foam and exhibited promising activities for both electrocatalytic hydrogen evolution reactions and supercapacitors.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Engineering, Environmental
Anuj Kumar, Ghulam Yasin, Mohammad Tabish, Dipak Kumar Das, Saira Ajmal, Ashok Kumar Nadda, Guoxin Zhang, T. Maiyalagan, Ali Saad, Ram K. Gupta, Mohamed M. Makhlouf, Shumaila Ibraheem
Summary: A conjugated poly-FePc was prepared via microwave-assisted polymerization and exhibited superior catalytic performance for oxygen reduction reaction (ORR). It displayed positive shifts in half-wave potential compared to monomeric FePc and traditional 20% Pt/C catalysts. The study suggests that adjusting the electronic structures of active sites can improve the performance of electrocatalysts.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Biotechnology & Applied Microbiology
Taghazal Zahra, Khuram Shahzad Ahmad, Camila Zequine, Ram Gupta, Mohammad Azad Malik, Javed H. Niazi, Anjum Qureshi
Summary: In this study, bimetallic NiO/ZrO2 catalysts were synthesized using plant extract as a capping agent, and their electrocatalytic performance was investigated. The experimental results demonstrate that the synthesized catalyst exhibits remarkable oxygen evolution reaction performance comparable to precious metal catalysts.
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
(2023)
Review
Chemistry, Inorganic & Nuclear
Sanket D. Bhoyate, Junyoung Kim, Felipe M. de Souza, Jerry Lin, Eunho Lee, Anuj Kumar, Ram K. Gupta
Summary: Metal-air batteries and fuel cells heavily rely on electrocatalytic O2 activation and O2 reduction reaction (ORR) with noble metal-free materials. However, the origins of their synergistic reactivity are still unclear. Understanding the correlation between science, engineering, and activity descriptors can lead to the development of novel, affordable, and efficient catalysts.
COORDINATION CHEMISTRY REVIEWS
(2023)
Review
Chemistry, Physical
A. A. P. R. Perera, K. A. U. Madhushani, Buwanila T. Punchihewa, Anuj Kumar, Ram K. Gupta
Summary: MXene is a versatile material with a wide range of applications, including energy storage, sensors, biomedical devices, and membranes. This review summarizes the latest findings on MXene materials, including their evolution, synthesis routes, applications, and surface functionalization. The review also highlights the use of MXene composites to enhance performance and overcome specific drawbacks. The information provided in this review is valuable for translating lab-scale findings into commercially viable products.
Review
Energy & Fuels
Kwadwo Mensah-Darkwa, Daniel Nframah Ampong, Perseverance Dzikunu, Felipe M. de Souza, Anuj Kumar, Ram K. Gupta
Summary: Multi-metallic metal-organic frameworks (MOFs) derived materials have outstanding CO2RR catalytic performance and high atomic utilization efficiency, but their structure tuning and identification of active sites remain challenging. This review provides an overview of the advancements in science and engineering of multi-metallic MOFs and derived materials, and discusses key methods and possibilities for optimizing their catalytic performance.
Article
Engineering, Electrical & Electronic
Nene Lethukuthula, Malik Dilshad Khan, Siphamandla C. Masikane, Felipe M. de Souza, Jonghyun Choi, Ram K. Gupta, Neerish Revaprasadu
Summary: In this study, a green and facile microwave-assisted approach was demonstrated for the synthesis of phase pure sulfur-deficient indium sulfide (In2.77S4) nanoparticles. Castor oil and olive oil were used as green dispersants, solvents, and capping agents. The effect of different sulfur sources on the synthesized nanoparticles was investigated using sodium sulfide, thioacetamide, and thiourea. The obtained In2.77S4 nanoparticles prepared in castor oil with thiourea as the sulfur source showed satisfactory properties for energy storage and water splitting.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Irum Shaheen, Khuram Shahzad Ahmad, Camila Zequine, Ram K. Gupta, Andrew G. Thomas, Anjum Qureshi, Mohammad Azad Malik, Javed H. Niazi
Summary: A facile nanocomposite of Pd/NiOPdO was synthesized using foliar phyto eco-friendly agents and showed enhanced electrochemical properties for supercapacitor application, with a specific capacitance of 88 F g(-1) and low internal resistance of 0.8 omega. The nanocomposite exhibited a mixed phase of rhombohedral NiO and tetragonal PdO.
Meeting Abstract
Chemistry, Applied
Prashant Kote, Magdalen Asare, Sahilkumar Chaudhary, Tim Dawsey, Ram Gupta
JOURNAL OF THE AMERICAN OIL CHEMISTS SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Ginena Bildard Shombe, Malik Dilshad Khan, Jonghyun Choi, Ram K. Gupta, Marcin Opallo, Neerish Revaprasadu
Summary: Mixed metal sulfides show great potential for electrochemical energy storage and conversion. The composition-dependent supercapacitive and water splitting performance of Ni(1-x)CuxCo2S4 solid solutions prepared via solvent-less pyrolysis were investigated. The materials exhibited varying supercapacitive and electrocatalytic properties depending on the composition.
