Article
Nanoscience & Nanotechnology
Amit S. Pawbake, Ruchita T. Khare, Joshua O. Island, Eduardo Flores, Jose R. Ares, Carlos Sanchez, Isabel J. Ferrer, Mahendra Pawar, Otakar Frank, Mahendra A. More, Herre S. J. van der Zant, Andres Castellanos-Gomez, Dattatray J. Late
Summary: The field emission properties of TiS3 nanosheets and nanoribbons synthesized from bulk titanium were investigated. The nanosheets exhibited enhanced field emission behavior with a low turn-on field and delivered a large emission current density at a relatively low applied electric field. The superior field emission performance of TiS3 nanosheets over nanoribbons makes them a propitious field emitter for vacuum nanoelectronics devices.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Chandradip D. Jadhav, Sachin R. Rondiya, Reshma C. Hambire, Devashri R. Baviskar, Avinash V. Deore, Russell W. Cross, Nelson Y. Dzade, Padmakar G. Chavan
Summary: Klockmannite (CuSe) was successfully synthesized using a three-probe electrochemical set-up, with vertically aligned nanosheets showing impressive field emission characteristics. The CuSe nanosheets exhibited low turn-on field and high current density, attributed to the metallic conductivity and low work function of the (001) surface.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Bo-Wen Ma
Summary: The effect of thiourea concentration in the reaction solution on the morphology and field emission properties of MoS2 nanosheets was investigated. Vertically aligned MoS2 nanosheets exhibited good emission stability.
Article
Multidisciplinary Sciences
Gobinda Das, Bikash Garai, Thirumurugan Prakasam, Farah Benyettou, Sabu Varghese, Sudhir Kumar Sharma, Felipe Gandara, Renu Pasricha, Maria Baias, Ramesh Jagannathan, Na'il Saleh, Mourad Elhabiri, Mark A. Olson, Ali Trabolsi
Summary: Ionic covalent organic frameworks (iCOFs) are porous materials with great potential for various applications. Functionalized iCOFs can be used as chemosensors for amine detection with high sensitivity, for example, to monitor meat spoilage.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Inorganic & Nuclear
Koki Sasaki, Tsuyoshi Okue, Yasuhiro Shu, Koji Miyake, Yoshiaki Uchida, Norikazu Nishiyama
Summary: A new synthesis method using multiple hydrophilic precursors in TRAP has successfully produced high-quality nanosheets of ZIF-8. The nanosheets are a few nanometers thick and several hundred nanometers wide, maintaining a high specific surface area.
DALTON TRANSACTIONS
(2021)
Article
Materials Science, Multidisciplinary
Mateus B. P. Querne, Jean M. Bracht, Juarez L. F. Da Silva, Anderson Janotti, Matheus P. Lima
Summary: Two-dimensional semiconductor materials have the potential for unconventional applications, and their properties are still being explored. In this study, the researchers used ab initio simulations to investigate a class of emerging 2D materials, and found that one structure has higher stability and different optoelectronic properties compared to another structure.
Article
Chemistry, Physical
Jia You, Fang Yuan, Shasha Cheng, Qianqian Kong, Yuelin Jiang, Xianzhu Luo, Yuezhong Xian, Cuiling Zhang
Summary: This study presents a novel AIEgen-based carbon-conjugated COF with high stability and fluorescence. Through modification and activation, the COF can be used for tumor cell imaging and ferroptosis.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Meng Liu, Songtai Liang, Dongfang Shi, Siyuan Yang, Yu Lei, Tie Li, Yuelin Wang
Summary: Nanoscale air/vacuum channel devices show great potential in extreme environments, high speed, and low power consumption, but achieving stable large current emission at low voltages remains challenging. A vertical structure with controlled emission currents and fast rise/fall times has been demonstrated, providing good manufacturing and integration possibilities for future nanoscale air/vacuum channel electronics.
Article
Chemistry, Multidisciplinary
Mengjie Li, Qilong Wang, Ji Xu, Jian Zhang, Zhiyang Qi, Xiaobing Zhang
Summary: In this study, vertical carbon nanotube arrays (VCNTAs) are reported as high-density electron sources that can modulate emission processes with laser pulses under a high applied electric field and laser illumination. The emission process shows sensitivity to a power law of the laser intensity as bias electric field and laser power density increase, supporting the mechanism of optically induced field emission followed by over-the-barrier emission. The polarization dependence exhibits a cosine behavior, confirming the likelihood of optically induced field emission.
Article
Chemistry, Multidisciplinary
Hai-Quan Liu, Cheng-Bao Yao
Summary: This work investigates the nonlinear optical behavior and carrier dynamics of doped zinc oxide (ZnO) films deposited on quartz substrates. The controllable nonlinear optical properties are achieved by doping aluminum (Al) atoms with different sputtering powers. The phase parameters of the films can be regulated by the sputtering power, as confirmed by experimental and calculated results. The light-matter interaction is not significantly suppressed by shading and scattering effects. Doping Al atoms can optimize the carrier dynamics and nonlinear effects. The results are confirmed by Z-scan and transient absorption spectroscopy.
Article
Materials Science, Multidisciplinary
Jing Wang, Yuanyuan Huang, Zhen Lei, Yayan Xi, Wanyi Du, Xueqin Cao, Yanqing Ge, Lipeng Zhu, Yixuan Zhou, Xinlong Xu
Summary: In this study, the spontaneous polarization and dynamical photoresponse of ferroelectric SnS nanosheets were noncontact optically characterized. The primary mechanism for THz emission was identified as shift current, and it was found to depend on the spontaneous polarization direction of the nanosheets. Furthermore, the polarization angle of the pump light could modulate the amplitude and phase of the THz wave, resulting in tunable ellipticity and orientation angle.
Article
Chemistry, Multidisciplinary
Keshab R. Sapkota, Francois Leonard, A. Alec Talin, Brendan P. Gunning, Barbara A. Kazanowska, Kevin S. Jones, George T. Wang
Summary: Top-down fabricated gallium nitride (GaN)-based nanoscale vacuum electron diodes exhibit record ultralow turn-on voltages and stable high field-emission currents, showing promise for high-performance and robust III-nitride-based vacuum nano-electronics applications.
Review
Engineering, Electrical & Electronic
Shanhai Zhao, Hao Ding, Xiaoqin Li, Haijing Cao, Yanyan Zhu
Summary: This article provides a comprehensive overview of the advancements in field emission devices, with a focus on the selection of electrode materials and design considerations. By exploring the trends and challenges in this area, the article aims to provide insights into future directions of research and outlines prospects and potential areas of growth.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Physics, Applied
M. Oleszko, A. Felix, R. Tomala, M. Chaika, W. Strek
Summary: This study investigates the effect of vacuum level on laser induced white emission (LIWE) of graphene foam and compares it with the electric incandescence of tungsten wire. The increase in pressure inside the dynamic vacuum chamber reduces the emission intensity of LIWE, while it has no effect on the emission of the electrically driven tungsten wire. A similar dependency is observed in the case of field emission (FE) of carbon cathodes. This analogy confirms that white emission and FE are coincident processes occurring during laser excitation of graphene foam.
APPLIED PHYSICS LETTERS
(2023)
Article
Multidisciplinary Sciences
Yuxuan Li, Yaoyao Han, Wenfei Liang, Boyu Zhang, Yulu Li, Yuan Liu, Yupeng Yang, Kaifeng Wu, Jingyi Zhu
Summary: By controlling the light helicity, the researchers observed spin-selective Bloch-Siegert shift in CsPbI3 perovskite quantum dots, which was accompanied by a higher ratio between the Bloch-Siegert and optical Stark shifts than predicted by the non-interacting model. The experimental observations were quantitatively reproduced using a model that explicitly accounted for excitonic effects, suggesting the importance of many-body interactions in correctly modeling the shift. These findings provide a basis for implementing these effects in information processing, optical modulation, and Floquet engineering.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Navendu Mondal, Rounak Naphade, Xiaohe Zhou, Yangzi Zheng, Kwangjae Lee, Issam Gereige, Ahmed Al-Saggaf, Osman M. Bakr, Omar F. Mohammed, Yuri N. Gartstein, Anton V. Malko
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2020)
Article
Chemistry, Physical
Jun Yin, Rounak Naphade, Luis Gutierrez Arzaluz, Jean-Luc Bredas, Osman M. Bakr, Omar F. Mohammed
ACS ENERGY LETTERS
(2020)
Article
Nanoscience & Nanotechnology
Yangzi Zheng, Rounak Naphade, Navendu Mondal, Osman M. Bakr, Omar F. Mohammed, Yuri N. Gartstein, Anton Malko
Summary: This study demonstrates the long-range exciton transfer in layered perovskite structures and provides a detailed investigation of exciton propagation through spatiotemporal dynamics of photoluminescence. The characteristic of photon recycling includes the appearance of PL emission rise times and elongation of PL decay with separation distance between excitation and emission locations.
Article
Chemistry, Multidisciplinary
Kwang Jae Lee, Bekir Turedi, Andrea Giugni, Muhammad Naufal Lintangpradipto, Ayan A. Zhumekenov, Abdullah Y. Alsalloum, Jung-Hong Min, Ibrahim Dursun, Rounak Naphade, Somak Mitra, Iman S. Roqan, Boon S. Ooi, Omar F. Mohammed, Enzo Di Fabrizio, Namchul Cho, Osman M. Bakr
Summary: Methylammonium lead iodide (MAPbI(3)) perovskite, a versatile material for optoelectronic applications, shows inconsistent TDPL and phase-transition characteristics due to crystal domain-size dependent residual stress and significant volume difference between orthorhombic and tetragonal phases. Understanding these key factors is crucial for the photophysics and material processing of soft perovskites.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Saidkhodzha Nematulloev, Ren-Wu Huang, Jun Yin, Aleksander Shkurenko, Chunwei Dong, Atanu Ghosh, Badriah Alamer, Rounak Naphade, Mohamed Nejib Hedhili, Partha Maity, Mohamed Eddaoudi, Omar F. Mohammed, Osman M. Bakr
Summary: This study presents a novel synthesis method for Cu NCs with bright emission in the near-infrared region and crystallization-induced emission enhancement phenomena, providing essential insights into the origins of their optical properties.
Article
Multidisciplinary Sciences
Jun Yin, Rounak Naphade, Partha Maity, Luis Gutierrez-Arzaluz, Dhaifallah Almalawi, Iman S. Roqan, Jean-Luc Bredas, Osman M. Bakr, Omar F. Mohammed
Summary: Hot-carrier cooling processes in hybrid perovskites with Rashba band splitting are investigated, revealing the acceleration of cooling at longer delays due to spin-flipping and spin-dependent scattering of hot electrons. Manipulating the spin state of hot carriers can extend the hot-carrier cooling, suggesting a new approach for improving the performance of hot-carrier-based devices.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Wasim J. Mir, Ahmed Alamoudi, Jun Yin, Khursand E. Yorov, Partha Maity, Rounak Naphade, Bingyao Shao, Jiayi Wang, Muhammad Naufal Lintangpradipto, Saidkhodzha Nematulloev, Abdul-Hamid Emwas, Alessandro Genovese, Omar F. Mohammed, Osman M. Bakr
Summary: The use of zwitterionic lecithin ligands can stabilize the perovskite phase of CsPbI3 QDs for long periods, allowing LEDs fabricated with them to achieve record-breaking efficiency and brightness in the Rec. 2020 standard.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Bekir Turedi, Muhammad N. Lintangpradipto, Oskar J. Sandberg, Aren Yazmaciyan, Gebhard J. Matt, Abdullah Y. Alsalloum, Khulud Almasabi, Kostiantyn Sakhatskyi, Sergii Yakunin, Xiaopeng Zheng, Rounak Naphade, Saidkhodzha Nematulloev, Vishal Yeddu, Derya Baran, Ardalan Armin, Makhsud Saidaminov, Maksym Kovalenko, Omar F. Mohammed, Osman M. Bakr
Summary: Single-crystal halide perovskites can maintain high charge-collection efficiency even with increased thickness without external bias. These findings are significant for the application of perovskite devices in optoelectronic applications that require a thick active layer.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Shanshan Zhang, Luis Gutierrez-Arzaluz, Jun Yin, Nimer Wehbe, Bingyao Shao, Rounak Naphade, Tengyue He, Partha Maity, Osman M. Bakr, Anton V. Malko, Omar F. Mohammed
Summary: By incorporating 5% of methylenediammonium dichloride (MDACl2), the density of iodide interstitials and surface recombination losses in mixed perovskite systems can be drastically reduced. This leads to photostable and ultra-low threshold amplified spontaneous emission (ASE) in cavity-free thin perovskite films. Additionally, an ultra-high optical gain of 1000 cm-1 is achieved, which is the highest reported for cavity-free perovskite films. These findings are supported by theoretical calculations and experimental measurements.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Partha Maity, Noor A. Merdad, Jehad K. El-Demellawi, Luis Gutierrez-Arzaluz, Zhixiong Liu, Rounak Naphade, Husam N. Alshareef, Osman M. Bakr, Omar F. Mohammed
Summary: In this study, the charge carrier dynamics at the interface between CsPbBr3 multiple quantum wells (MQWs) and TiO2 and Spiro-OMeTAD were investigated, and it was found that the charge carrier extraction occurred through a quantum tunneling effect. The impact of the barrier-thickness-dependent quantum tunneling effect on the photoelectric behavior of the synthesized QW photodetector devices was also studied.
Article
Optics
Kostiantyn Sakhatskyi, Bekir Turedi, Gebhard J. Matt, Erfu Wu, Anastasiia Sakhatska, Vitalii Bartosh, Muhammad Naufal Lintangpradipto, Rounak Naphade, Ivan Shorubalko, Omar F. Mohammed, Sergii Yakunin, Osman M. Bakr, Maksym V. Kovalenko
Summary: We demonstrate single-photon counting and long-term stability of perovskite X-ray detectors in the photovoltaic mode, using thick and uniform methylammonium lead iodide single-crystal films (up to 300 μm) and solution directly grown on hole-transporting electrodes. These findings pave the path for the implementation of hybrid perovskites in low-cost, low-dose commercial detector arrays for X-ray imaging with single-photon sensitivity.
Article
Nanoscience & Nanotechnology
Noor A. Merdad, Yue Wang, Omar Alkhazragi, Zyad O. F. Mohammed, Partha Maity, Luis Gutierrez-Arzaluz, Haoze Yang, Rounak Naphade, Chun Hong Kang, Tien Khee Ng, Osman M. Bakr, Boon S. Ooi
Summary: In this study, the authors fabricated cesium lead bromide (CsPbBr3) thin films of varying thicknesses and investigated their visible-light communication (VLC) performance. Thicker films were found to have a more homogeneous surface and fewer surface trap states than thinner films. The 20-nm-thick CsPbBr3 film exhibited the best performance with a -3-dB bandwidth of 30.7 MHz and a net data rate of 330 Mb/s, making it suitable for high-power, high-speed, and large-area transmission and detection of visible-light signals.
Article
Materials Science, Multidisciplinary
Khursand E. Yorov, Wasim J. Mir, Xin Song, Luis Gutierrez-Arzaluz, Rounak Naphade, Saidkhodzha Nematulloev, Cailing Chen, Ren-Wu Huang, Bingyao Shao, Bashir E. Hasanov, Yu Han, Omar F. Mohammed, Osman M. Bakr
Summary: This study proposes a colloidal approach for the preparation of Mn4+-doped inorganic hexafluoride nanocrystals, which allows for the fine-tuning of the dopant concentration and solution processing. The resulting nanocrystals exhibit narrow-band bright-red emission, high photoluminescence quantum yield, and long-term stability, making them suitable for applications such as X-ray imaging scintillators.
ACS MATERIALS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Abdullah Y. Alsalloum, Bekir Turedi, Khulud Almasabi, Xiaopeng Zheng, Rounak Naphade, Samuel D. Stranks, Omar F. Mohammed, Osman M. Bakr
Summary: By utilizing a mixed-cation single-crystal absorber layer, the external quantum efficiency band edge can be redshifted, leading to increased short-circuit current densities and overall efficiencies.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jawaher Almutlaq, Wasim J. Mir, Luis Gutierrez-Arzaluz, Jun Yin, Serhii Vasylevskyi, Partha Maity, Jiakai Liu, Rounak Naphade, Omar F. Mohammed, Osman M. Bakr
Summary: Lead-free CsMnBr NCs exhibit a high photoluminescence quantum yield and an exceptionally short radiative lifetime, making them a promising material for optoelectronic applications.
ACS MATERIALS LETTERS
(2021)
