Article
Chemistry, Analytical
Samya Neogi, Ranajit Ghosh
Summary: The present study investigates the ion-dipole interaction mechanism in VOC sensing using a sol-gel synthesized BiFeO3 chemi-resistive sensor. The sensor shows selective detection of acetone vapor and higher response towards polar VOCs. The response time decreases exponentially with the increase in the dipole moment of the VOCs, and acetone exhibits the lowest response time among other target vapors.
ANALYTICA CHIMICA ACTA
(2022)
Article
Electrochemistry
Karin Kleiner, Claire A. Murray, Cristina Grosu, Bixian Ying, Martin Winter, Peter Nagel, Stefan Schuppler, Michael Merz
Summary: Studies show that redox reactions in lithium transition metal oxides proceed through the reversible oxidation of nickel forming covalent bonds with oxygen neighbors, rather than pure cationic or anionic processes, which affects the reversible capacity and electronic structure of the cathodes.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Huifen Liu, Nengxu Li, Zehua Chen, Shuxia Tao, Chunlei Li, Lang Jiang, Xiuxiu Niu, Qi Chen, Feng Wang, Yu Zhang, Zijian Huang, Tinglu Song, Huanping Zhou
Summary: Phase instability is a major obstacle for the widespread application of formamidinium (FA)-dominated perovskite solar cells. This study investigates the reversible phase-transition process of FA(1-)(x)Cs(x)PbI(3) perovskite under humidity and the healing process of degraded devices. The findings provide a deepened understanding of the phase-transition process and offer an effective means to stabilize FA-dominated perovskites and devices for practical applications.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Akash Singh, Manoj K. Jana, David B. Mitzi
Summary: By structurally tailoring a 2D MHP with bulky chiral organic cations, an unusual confluence of exceptionally low melting temperature (175°C) and inhibited crystallization is achieved. This chiral MHP can be melt-quenched into a stable glassy state, otherwise inhibited in analogous racemic MHPs. The facile and reversible switching between glassy and crystalline states in the chiral MHP presents new opportunities for applications such as nonvolatile memory, optical communication, and neuromorphic computing.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Chen Li, Ke Liu, Dequan Jiang, Ting Wen, En Chen, Yingying Ma, Binbin Yue, Shengqi Chu, Yonggang Wang
Summary: The pressure-induced multiswitching behaviors of structural and physical properties in two chromium selenides, CrSe and Cr2Se3, have been investigated. The results show that pressure engineering can effectively and flexibly regulate the photoelectric properties of materials, which provides a potential foundation for fabricating innovative pressure-responsive multifunctional devices.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Michael Merz, Bixian Ying, Peter Nagel, Stefan Schuppler, Karin Kleiner
Summary: This study investigates the reversible and irreversible charge exchange reactions of Li- and Mn-rich layered oxides, and demonstrates the relationship between O-O formation in the bulk and reduction/oxidation processes of Ni, Co, and Mn. It also discusses the reversibility of charge compensation reactions and differences between O-O formation and oxygen release during activation.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Oluchi Nkwachukwu, Charles Muzenda, Babatope O. Ojo, Busisiwe N. Zwane, Babatunde A. Koiki, Benjamin O. Orimolade, Duduzile Nkosi, Nonhlangabezo Mabuba, Omotayo A. Arotiba
Summary: A perovskite-based photoelectrochemical system was developed for the degradation of organic pollutants in wastewater. La3+-doped BFO photoanodes showed enhanced performance, with the best electrode exhibiting a three times higher current response than pure BFO. The improvements in electrode performance were attributed to the synergistic effect of applied bias potential and the introduction of La3+ into the BFO matrix.
Article
Environmental Sciences
Xing Zheng, Muhammad Tariq Khan, Xin Cao, Jean-Philippe Croue
Summary: This study compared the chemical properties and fouling potential of biopolymers extracted from secondary wastewater effluent and surface water during ultrafiltration. It was found that EfOM biopolymers were enriched in protein structures and caused more irreversible fouling compared to NOM biopolymers. Additionally, the presence of divalent cations increased the irreversibility of fouling, with a more significant impact on NOM fouling.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Materials Science, Multidisciplinary
Hongxiang Xu, Junhua Xu, Hongbo Li, Wenzhao Zhang, Yamei Zhang, Zhangyin Zhai
Summary: By lowering the working temperature and increasing sensitivity, Sr-doped ferrite bismuth nanomaterial can significantly enhance gas sensor sensitivity and decrease working temperature, showing equal high sensitivity to ethanol and acetone.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Jie Li, Zhi-Xu Zhang, Tie Zhang, Pei-Zhi Huang, Ting Shao, Yi Zhang, Da-Wei Fu
Summary: In this study, a novel two-dimensional organic-inorganic material with excellent reversible chromic/dielectric response under thermal stimulation was successfully designed and fabricated. The material exhibited reversible color change, sensitive dielectric transition, and high fatigue resistance.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Energy & Fuels
Basheer M. Al-Maswari, Jahangeer Ahmed, Nabil Alzaqri, Tansir Ahamad, Yuanbing Mao, Abdo Hezam, B. M. Venkatesha
Summary: Perovskites, including bismuth ferrite embedded nitrogen-doped carbon nanocomposites, have been synthesized for energy storage applications. The nanocomposites exhibit excellent specific capacitance and charge-discharge capacity, demonstrating efficient and low-cost synthesis methods for enhanced electrochemical performances in energy storage applications.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Engineering, Environmental
Zuoqing Liu, Dongfang Cheng, Yinlong Zhu, Mingzhuang Liang, Meiting Yang, Guangming Yang, Ran Ran, Wei Wang, Wei Zhou, Zongping Shao
Summary: Driven by the demand for sustainable energy, reversible proton ceramic electrochemical cells (R-PCECs) have attracted attention. However, the low activity and poor durability of the oxygen electrode limit their large-scale application. In this study, a novel oxygen electrode material with high activity and stability is developed through partial doping of non-metallic phosphorus. The results show promising potential for non-metal-doped oxygen electrode materials in practical R-PCECs.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Steve Kamau, Jin Hou, Noah Hurley, Khadijah Alnasser, Siraj Sidhik, Evan Hathaway, Roberto Gonzalez Rodriguez, Anupama Kaul, Jingbiao Cui, Aditya Mohite, Yuankun Lin
Summary: The layer edge states or low energy state (LES) in 2D hybrid organic-inorganic perovskites exhibit a prolonged carrier lifetime, which enhances the performance of optoelectronic devices. This study investigates the LES in 2D Ruddlesden-Popper perovskites with n = 2 and n = 3 using photoluminescence (PL) measurements. The PL study reveals reversible and irreversible surface relaxations in different laser intensity ranges, supporting the idea of tunable LES. The findings provide insights into improving the photostability of 2D perovskites and understanding the role of LES in optoelectronic device performance.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Xixi Ren, Guoqiang Tan, Jincheng Li, Yun Liu, Mintao Xue, Huijun Ren, Ao Xia, Wenlong Liu
Summary: This study investigates the enhanced intrinsic ferroelectricity in multi-doped BFO by reducing the height of the electrostatic barrier, changing the Fermi level, and increasing the Schottky barrier height to reduce leakage current. Additionally, the use of multivalent Mn improves the ferromagnetism in the material. These enhancements make BFO applicable in a variety of practical devices and fields.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Qiangqiang Jia, Ting Shao, Liang Tong, Changyuan Su, Dawei Fu, Haifeng Lu
Summary: Layered heterometallic halide perovskites have attracted significant scientific attention as a newly explored material. Lead-free or lead-substituted perovskite materials, as representatives of perovskites, are widely utilized in various fields such as photovoltaics, sensors, catalysis, and detectors. This study reports a lead-free bilayer heterometallic Ruddlesden-Popper type perovskite, [(MACH)2CsAgBiBr7], which undergoes a reversible phase transition during a heating-cooling cycle. It exhibits reddish-brown light emission under 365 nm, with a CIE chromaticity coordinate of (0.32, 0.45) and a correlated color temperature of approximately 6000 K. Additionally, experimental data and theoretical calculations suggest that [(MACH)2CsAgBiBr7] shows indirect semiconducting characteristics. In summary, this work provides inspiration for the design of lead-free heterometallic perovskite materials in the fields of sensors and light-emitting diodes (LEDs).
CHINESE CHEMICAL LETTERS
(2023)
Article
Chemistry, Analytical
Samya Neogi, Ranajit Ghosh
Summary: The present study investigates the ion-dipole interaction mechanism in VOC sensing using a sol-gel synthesized BiFeO3 chemi-resistive sensor. The sensor shows selective detection of acetone vapor and higher response towards polar VOCs. The response time decreases exponentially with the increase in the dipole moment of the VOCs, and acetone exhibits the lowest response time among other target vapors.
ANALYTICA CHIMICA ACTA
(2022)
Article
Materials Science, Multidisciplinary
Samya Neogi, Ranajit Ghosh
Summary: By utilizing a low-cost silver-doping strategy, the sensing performance of the BiFeO3 chemi-resistive sensor can be improved, allowing for selective detection of acetone vapor with faster response times and removal of irreversibility. The silver-doped sensor shows superior response values and response times compared to the undoped sensor, demonstrating enhanced sensing capabilities.
APPLIED MATERIALS TODAY
(2022)
Review
Chemistry, Physical
Rinku Paul, Biswajit Das, Ranajit Ghosh
Summary: Current research focuses on developing cost-effective high-performance gas sensors at low operating temperature. Shortcomings of semiconducting metal oxides (SMOs)-based high operating temperature sensors include high power consumption, high manufacturing cost, detonation risk for explosive gas detection, and lack of long-term stability. This review highlights recent advancements in SMOs-based heterostructures for room temperature gas sensors, exploring the effects of different nano-junctions, porosity, quantum dots, and distinct facets. Incorporating high conductive materials such as carbon nanotubes, graphene, and activated carbon in SMOs can reduce sensor resistance and operating temperature. Various sensing mechanisms, such as heterojunction formation and Knudsen diffusion model, have been elucidated for high sensing performance gas sensors. Finally, future prospects for room temperature gas sensors are addressed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Pritam Biswas, Prabhat Kumar Prajapati, Chandra Obulesu Bapanapalle, Kishor Kumar Sadhu, Ranajit Ghosh, Nilrudra Mandal
Summary: Correlating the microstructure and tribo-mechanical properties is a promising approach for evaluating the performance of high-temperature materials. This study investigates the addition of extremely low amounts of multi-walled carbon nanotube (MWCNT) into a zirconia toughened alumina (ZTA)- 0.6 wt% magnesium oxide (MgO) ceramic matrix to improve its mechanical and tribological performance. The resulting MWCNT-reinforced composites exhibit excellent tribo-mechanical properties, with noticeable improvements in hardness and fracture toughness. The advanced micromechanical interlocking mechanism and three-body abrasive wear contribute to the impeccable anti-wear and lubrication performance of the composites, making them suitable for high-temperature wear resistance applications.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Rinku Paul, Ranajit Ghosh
Summary: Recently, the use of low-dimensional semiconducting metal oxide (SMO) nanostructures has transformed conventional SMO-based gas sensors by capitalizing on their unique catalytic, electrical, and optical properties. By incorporating carbon nanotubes (CNTs), the working temperature of SMO-based sensors can be effectively reduced. In this study, CeO2 quantum dots (QDs) decorated CNT-based nanocomposites demonstrated outstanding performance in detecting acetone at room temperature (27 degrees C). These nanocomposites, with a hydrothermally prepared CeO2 QDs/CNT mesoporous heterostructure, exhibited a high response, ultrafast response/recovery time, and high selectivity towards acetone. The enhanced sensing properties were attributed to the presence of Ce3+ states, which led to increased adsorption capabilities of the nanocomposites, as well as the fast diffusion of acetone molecules facilitated by the mesoporosity and the low operating temperature enabled by highly conductive CNTs. Additionally, the multi-nanojunctions between CeO2 QDs and CNTs significantly influenced the improved response value in detecting acetone at room temperature.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Biswajit Das, Rinku Paul, Ranajit Ghosh
Summary: Implementation of easy and affordable processes, we have fabricated four different non-trivial designs of SnS2 based chemiresistive sensors for NH3 detection. The performances of these sensors vary with the increase of the exposed junction region (P) and the decrease of the resistance (R). Among them, the FTO/porous nickel foil based sensor shows the highest response, fastest response time and lowest limit of detection.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Biswajit Das, S. K. Riyajuddin, Kaushik Ghosh, Ranajit Ghosh
Summary: We have successfully developed room-temperature NH3 sensors using liquid-phase-exfoliated layered n-Bi2Se3/p-Bi2O3. Sensor B14 showed excellent sensing performance with high selectivity and a response of 8.5 towards 180 ppm of NH3. The sensing mechanism is based on physisorption and charge transfer at the adsorption sites on the Bi2Se3 surface, as well as modulation of barrier potential between n-Bi2Se3 and p-Bi2O3. The sensor also demonstrated good long-term stability over 90 days.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
