Article
Chemistry, Analytical
Minh-Huy Dinh Dang, Sachin T. Navale, Dong Hoon Yang, Jin-Young Kim, Linh Ho Thuy Nguyen, Ngoc Xuan Dat Mai, Thang Bach Phan, Hyoun Woo Kim, Tan Le Hoang Doan, Sang Sub Kim
Summary: This study proposes a solvothermal method for synthesizing sulfate-functionalized hafnium-organic frameworks (Hf-BTC-SO4) for low-temperature NH3 gas sensors. The characterization of Hf-BTC-SO4 shows good crystallinity, high thermal stability, and ultra-high specific surface area. The gas-sensing experiments confirm the selective detection of NH3 gas at a lower working temperature and excellent response reversibility.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Xiaohui Duan, Zaihua Duan, Yajie Zhang, Bohao Liu, Xian Li, Qiuni Zhao, Zhen Yuan, Yadong Jiang, Huiling Tai
Summary: By using an in-situ polymerization method, PANI/halloysite nanotubes (PANI/HNTs) composite was prepared and exhibited better NH3 gas sensing performance compared to pure PANI material due to the unique hollow structure and larger specific surface area of HNTs.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Sonia Freddi, Daniele Perilli, Luca Vaghi, Mauro Monti, Antonio Papagni, Cristiana Di Valentin, Luigi Sangaletti
Summary: This study presents an easy and cost-effective method to functionalize graphene through thermally activated dimerization of 2,5-diaryltetrazoles, and introduces the use of tetrazoles to prepare graphene-based chemiresistors. The tests show that this method is sensitive to ammonia and the sensors perform better than bare graphene.
Article
Chemistry, Analytical
Hao Wu, Jun Yu, Guanyu Yao, Zhongzhou Li, Wenjing Zou, Xiaogan Li, Huichao Zhu, Zhengxing Huang, Zhenan Tang
Summary: In this study, Ti3C2Tx with oxygen-rich functional groups and Ag-loaded Ti3C2Tx were successfully fabricated by the reuse of oxidized Ti3C2Tx. Experimental results showed that Ag-loaded Ti3C2Tx exhibited better sensitivity to NH3 and humidity resistance compared to single/few-layer Ti3C2Tx. Simulation results demonstrated that Ag-loaded Ti3C2Tx had less degradation in response to humidity changes and the Ti atom on the Ti3C2O2 surface contributed to the gas sensing performance. Furthermore, the formation of heterojunction between Ag and Ti3C2Tx improved the gas-sensing response.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Electrical & Electronic
Chuanlai Zang, Kaijie Ma, Yasuo Yano, Shuowei Li, Hiroyasu Yamahara, Munetoshi Seki, Tetsuya Iizuka, Hitoshi Tabata
Summary: The development of semiconductor gas sensors has the potential for noninvasive health monitoring through breath analysis. Tin oxide-copper oxide heterocomposite nanofibers were fabricated by electrospinning and calcination for ammonia sensing. The nanofibers showed enhanced ammonia-sensing response compared to pure tin oxide nanofibers, with a significant improvement in sensitivity at a SnO2:CuO ratio of 2:1. The mechanism and temperature-dependent response were also investigated, and a breath analysis application based on the fabricated sensors was demonstrated.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Physical
Sicheng Liu, Yuxiang Qin, Jing Xie
Summary: Noble metal-doping and modification have been effective in improving the gas-response performance of semiconductor sensors. In this study, a Bi2MoO6-based gas sensor capable of sensing ppb-level NH3 at room temperature via introducing silver (Ag) was developed.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Materials Science, Composites
Mohsen Peykari, Saeed Pourmahdian
Summary: Conductive hydrogels have gained attention for electronic applications due to their electrical conductivity, flexibility, and conformability. In this study, a polyaniline-based conductive hydrogel was successfully synthesized and carbon nanotubes were incorporated to enhance its electrical conductivity. The results showed that the method of incorporation affected the microstructure and electrical properties of the hydrogel.
JOURNAL OF COMPOSITE MATERIALS
(2023)
Review
Chemistry, Inorganic & Nuclear
Ruksana Shaik, Roopa Kishore Kampara, Amit Kumar, Chandra Shekhar Sharma, Mahesh Kumar
Summary: With industrial escalation, air toxicity increases, leading to a decline in air quality. Monitoring environmental pollutants is essential for protecting animals and humans, as dangerous gases like NH3, H2S, CO2, etc., can cause fatal diseases.
COORDINATION CHEMISTRY REVIEWS
(2022)
Article
Chemistry, Analytical
Pi-Guey Su, Meng-Shian Tsai, Chia-Jung Lu
Summary: Room temperature NH3 gas sensors composed of noble metal/polythiophene/reduced graphene oxide ternary nanocomposite films were fabricated and characterized. Among them, the Au/PTh/rGO film exhibited the highest response to NH3 gas at room temperature, particularly at low concentration levels.
ANALYTICAL METHODS
(2022)
Article
Chemistry, Analytical
Amit Kumar Shringi, Amit Kumar, Maloy Das, Sang Sub Kim, Hyoun Woo Kim, Mahesh Kumar
Summary: Novel metal functionalization of semiconductor metal oxide surfaces can effectively improve the selectivity and sensitivity of gas sensors. In this study, the functionalization of α-Fe2O3 sensor with silver nanoparticles enhanced its sensing performance for NO2 molecules, resulting in a higher relative response rate.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Analytical
Shijie Gai, Bin Wang, Xiaolin Wang, Runze Zhang, Shoulei Miao, Yiqun Wu
Summary: By tightly combining TfmpoPcCo on the surface of MCNT@PPy, a MCNT@PPy/TfmpoPcCo hybrid with a uniform 3D network was constructed, and an excellent NH3 sensor with ultrafast response/recovery time and low detection limit was achieved. The sensor exhibits outstanding gas selectivity and stability.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Merel J. Lefferts, Ben Armitage, Krishnan Murugappan, Martin R. Castell
Summary: This study demonstrates the use of PEDOT conducting polymer percolation networks for sensitive and reversible NO2 sensing. By adjusting the polymerization and doping conditions, control over sensing behavior is achieved, resulting in reversible NO2 sensors with higher sensitivity compared to traditional thin film sensors. A detection limit of 907 +/- 102 ppb was achieved.
Article
Chemistry, Multidisciplinary
Nirman Chakraborty, Swastik Mondal
Summary: Chemiresistive gas sensors mainly operate at high temperatures, but this work has developed a new material that can detect ammonia gas at low temperatures.
MATERIALS HORIZONS
(2022)
Article
Chemistry, Analytical
Dong Hoon Yang, Trang Thi Thu Nguyen, Sachin T. Navale, Linh Ho Thuy Nguyen, Y. Thi Dang, Ngoc Xuan Dat Mai, Thang Bach Phan, Jin-Young Kim, Tan Le Hoang Doan, Sang Sub Kim, Hyoun Woo Kim
Summary: Low-temperature operating chemiresistive gas sensors have advantages such as low power consumption, profitability, and device miniaturization. A solvothermal-processed amine-functionalized zinc-based metal-organic framework was developed as a detection material for a low-temperature H-2 gas sensor. The sensor showed significant sensitivity to low concentrations of H-2 at 50 degrees C.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Shilei Fan, Guocai Lu, Yinhua Hu, Wei Zheng, Xianghong Liu, Jun Zhang
Summary: This study demonstrates the fabrication of a flexible gas sensor based on few-layer In2Se3 nanosheets synthesized by CVD, which shows high sensitivity and fast response/recovery speed to NO2 at room temperature. The piezoelectric effect induced by mechanical deformation significantly improves the sensor response, attributed to the coupled effect of piezoelectricity and adsorption-induced charge transfer.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Nanoscience & Nanotechnology
Jayaseelan Dhakshinamoorthy, Sachin Kumar Srivastava, Durgamadhab Mishra, Biji Pullithadathil
Summary: This study explores the interplay between magnetic ordering and excess induced native defects in undoped anatase TiO2 nanoparticles using an experimental and theoretical approach. The research demonstrates that structurally disordered TiO2 nanoparticles with a high concentration of native defects, such as titanium interstitials and oxygen vacancies, are synthesized through controlled atmospheric rapid cooling process. The study also explains the possible origin of magnetic ordering in titanium deficient anatase TiO2 system based on first-principle calculations.
Article
Thermodynamics
Vijayasree Haridas, A. Sukhananazerin, Biji Pullithadathil, Binitha N. Narayanan
Summary: This study demonstrates the preparation of α-Fe2O3/graphene nanocomposite with excellent supercapacitor performance, high conductivity, and ultrahigh specific capacitance values. The composite shows good cyclic stability with a significant increase in specific capacitance compared to α-Fe2O3 and graphene.
Article
Chemistry, Multidisciplinary
Shalini Halan Joghee, Kamachi Mudali Uthandi, Nimmi Singh, Sanjeev Katti, Peeyush Kumar, Maninder Pal Kaur, Biji Pullithadathil
Summary: The study successfully developed an integrated strategy to create antireflective coatings with self-cleaning capabilities based on periodic double-sided photonic gamma-AlOOH nanostructures, achieving optical transmittance of 97% in the range of 350-800 nm. The nanostructures exhibited excellent self-cleaning performance and abrasion resistance, with a relative enhancement of 17% in the photovoltaic performance of coated modules.
Article
Medicine, General & Internal
Jaehyung Jeon, Chanyong Park, Dinesh Veeran Ponnuvelu, Sungsu Park
Summary: This study introduces a novel method for fabricating 3D-muPADs with enclosed channels, which show enhanced sensitivity compared to traditional hemi channel designs. The stoppage of evaporation in the enclosed channels significantly improves detection performance, with glucose detection as low as 0.3 mM achieved.
Article
Chemistry, Physical
Mahaboobbatcha Aleem, Ramakirshnan Vishnuraj, Balachander Krishnan, Biji Pullithadathil
Summary: An industry-ready strategic process for cost-effective, micropatterned Ni-Cu-Sn front contact metallization has been demonstrated, utilizing maskless direct-write lithography to enhance the efficiency of silicon solar cells. By optimizing various process parameters, a high-efficiency silicon solar cell has been successfully developed.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Analytical
Chanyong Park, Abdurhaman Teyib Abafogi, Dinesh Veeran Ponnuvelu, Ilchan Song, Kisung Ko, Sungsu Park
Summary: This study focuses on improving the ATP luminescence assay for the detection of CTCs by using a 3D printed immunomagnetic concentrator (3DPIC) to separate and concentrate CTCs in the blood. The results show that 3DPIC can concentrate cancer cells in blood by 100 times within minutes, enabling the ATP luminescence assay to detect as low as 10 cells in blood, which is approximately 10 times more sensitive than using commercial kits for CTC concentration.
Article
Chemistry, Applied
Thangavelu Kokulnathan, Ramakrishnan Vishnuraj, Shen-Ming Chen, Biji Pullithadathil, Faheem Ahmed, P. M. Z. Hasan, Anwar L. Bilgrami, Shalendra Kumar
Summary: A one-dimensional titanium dioxide encapsulated with gold heterojunction nanofibers was successfully synthesized and applied as robust electrocatalysts for the detection of diphenylamine, showing enhanced detection activity. The modified electrode also exhibited good selectivity towards the electrochemical oxidation of DPA and proved effective in detecting the effect of DPA on spiked content in food samples.
Article
Chemistry, Physical
Mohammad Gholinejad, Rahimeh Khezri, Sara Nayeri, Ramakrishnan Vishnuraj, Biji Pullithadathil
Summary: Bimetallic Au/NiO and Au/CuO catalysts have been developed through wet-chemical routes and have shown excellent catalytic activity in the reduction of nitroarenes and A3-coupling reaction. The catalysts can be reused multiple times without losing their activity.
MOLECULAR CATALYSIS
(2022)
Article
Chemistry, Physical
Thangavelu Kokulnathan, Ramakrishnan Vishnuraj, Tzyy-Jiann Wang, Biji Pullithadathil
Summary: In this study, an electrochemical sensor for the detection of the antimicrobial drug nitrofurazone (NFZ) was developed using a nanocomposite material TiO2/Au-NFs/O-C3N4. The sensor showed high sensitivity, wide working range, good stability, and selectivity. It successfully monitored the quantity of NFZ in real samples.
APPLIED SURFACE SCIENCE
(2022)
Article
Energy & Fuels
Mahaboobbatcha Aleem, Ramakrishnan Vishnuraj, Balachander Krishnan, Anuradha Ashok, Biji Pullithadathil
Summary: An in-house-developed nanoimprint lithography system is designed to create narrow linewidth finger patterns on silicon solar cells, effectively reducing shadow loss. The system utilizes optimal force and reactive ion etching to achieve damage-free patterns and enhance adhesion strength. The resulting Ni-Cu-Sn metallization improves cell efficiency by approximately 6% compared to commercial Ag screen-printed metallization.
Article
Nanoscience & Nanotechnology
Navami Sunil, Rajesh Unnathpadi, Biji Pullithadathil
Summary: A label-free, non-invasive salivary sensor platform based on surface-enhanced Raman spectroscopy (SERS) using carbon nanofiber surface-anchored bimetallic Nickel@Silver core-shell nanoparticles (Ni@Ag/CNFs) has been shown to be an effective pre-diagnostic screening tool for lung cancer by monitoring the abnormal concentrations of potential biomarkers in saliva.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ramakrishnan Vishnuraj, Mahaboobbatcha Aleem, Keerthi G. Nair, Biji Pullithadathil
Summary: Highly aligned 1D n-p type ZnO/Bi2O3 and n-n type ZnO/In2O3 heterojunction nanofibers (HNFs) were developed using coaxial electrospinning, showing enhanced NO2 sensing properties compared to pristine ZnO NFs. The improved sensitivities were attributed to the unique electron transport properties and surface band bending caused by the work function differences. The study also revealed the complex sensing mechanisms associated with the n-p/n-n type HNFs.
MATERIALS ADVANCES
(2023)
Article
Materials Science, Multidisciplinary
Keerthi G. Nair, Ramakrishnan Vishnuraj, Biji Pullithadathil
Summary: One-dimensional aligned carbon nanofibers with in-situ functionalized bimetallic nanoparticles have been developed as a hydrogen sensor, demonstrating high sensitivity, outstanding selectivity, and excellent long-term stability. The sensor, based on co-axially aligned CF@NiNP-PtNP, shows a hydrogen adsorption rate constant comparable to experimental values, indicating its potential suitability for real-time applications at room temperature.
MATERIALS ADVANCES
(2022)
Article
Engineering, Electrical & Electronic
Keerthi G. Nair, Ramakrishnan Vishnuraj, Biji Pullithadathil
Summary: The investigation presents a flexible H-2 gas sensor utilizing less platinum bimetallic nickel-platinum nanocatalyst-functionalized carbon nanofibers. The sensor exhibits excellent response, selectivity, and stability under bending conditions, showcasing potential applications in flexible electronics, biomedical, and environmental monitoring.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ramakrishnan Vishnuraj, Jayaseelan Dhakshinamoorthy, Keerthi G. Nair, Mahaboobbatcha Aleem, Biji Pullithadathil
Summary: A coaxial electrospinning with in situ photoreduction process was demonstrated for the fabrication of 1D aligned gold nanoisland anchored ZnO-based Heterojunction Nanofibers (HNFs) for gas sensing applications, exhibiting excellent sensor response and rapid response time at reduced operating temperature. Operando studies revealed the role of metallic Au plasmonic effect and zinc interstitial defects and oxygen vacancies in influencing charge transfer, providing insights into the design of MEMS-based gas sensors.
MATERIALS ADVANCES
(2021)
