Article
Chemistry, Multidisciplinary
Xiaoling Bao, Jianhong Liu, Qingshu Zheng, Lixin Duan, Yuzhu Zhang, Junlong Qian, Tao Tu
Summary: A colorimetric method utilizing gold nanoparticles for visual detection of melamine in raw milk was developed, with a detection limit as low as 2.4 ppb. The color change from red to blue observed by the naked eye in the presence of trace amount of melamine was attributed to the interaction between the thymine fragment and melamine.
CHINESE CHEMICAL LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Selen Durmazel, Aysem Uzer, Resat Apak
Summary: In this paper, a simple and rapid nanosensing assay was developed using unlabeled gold nanoparticles (AuNPs) and the supramolecular association of NTO with melamine (MEL). The concentration of NTO could be determined by observing color change, even at a sub-femtomolar level. The analytical results showed a linear relationship between the logarithm of NTO concentration and the absorption ratio. The synthesized AuNPs were characterized using various methods, and potential interferences were examined. NTO recovery was also achieved successfully.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Atsuya Muranaka, Hayato Ban, Masaya Naito, Shinobu Miyagawa, Masahiro Ueda, Shin Yamamoto, Mei Harada, Hikaru Takaya, Masaki Kimura, Nagao Kobayashi, Masanobu Uchiyama, Yuji Tokunaga
Summary: A molecular sensor has been developed for the naked-eye detection of glutaric acid and isophthalic acid. The sensor selectively forms 1:2 complexes with C3 dicarboxylic acids and dimerizes through strong π-π stacking interactions.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Shiori Abe, Shin-ichi Kondo
Summary: Silanediols with naphthyl moieties substituted at 5-position with cyano and N,N-dimethylamino groups have been synthesized and characterized. The substituents on the naphthyl moieties have a strong influence on their reactivity, photophysical properties, and anion sensing abilities. Silanediols bearing 1-(5-N,N-dimethylaminonaphthyl) groups exhibit large Stokes shifts and high quantum yields. They also show favorable ratiometric fluorescence responses to biologically important anions, AcO- and H2PO4-, with high association constants.
Article
Chemistry, Analytical
S. Sharmila, D. Ravi Shankaran
Summary: Cellulose-based nanoplasmonic sensors have advantageous physicochemical characteristics for various applications. In this study, a hydrogel-based nanoplasmonic sensor probe was fabricated and evaluated for the detection of melamine. The sensor showed high selectivity and sensitivity for melamine detection, making it potentially useful for food sensor applications.
ANALYTICAL METHODS
(2022)
Article
Biochemistry & Molecular Biology
Dandan Jiang, Minghao Zheng, Xiaofan Ma, Yingzhen Zhang, Shaohua Jiang, Juanhua Li, Chunmei Zhang, Kunming Liu, Liqing Li
Summary: A fluorescent and colorimetric poly(acrylamide)-based copolymer probe P(AAm-co-RBNCH) has been designed for selective detection of Fe3+ ions. The probe shows high sensitivity and selectivity for Fe3+ ions in the range of 100-200 μM. The hydrogel sensor exhibits good swelling properties and reversibility.
Article
Chemistry, Multidisciplinary
Paula M. Castillo, Francisco J. Fernandez-Acejo, Jose M. Carnerero, Rafael Prado-Gotor, Aila Jimenez-Ruiz
Summary: The study utilizes the stabilizing effect of lysozymes to develop a quick naked-eye test for detecting urinary lysozyme concentrations over 57.2 μg/mL. By calculating color difference parameters, the test can reliably provide a positive colorimetric response in less than 15 minutes, making it useful for detecting disorders such as leukemia-associated lysozymurias.
Article
Materials Science, Multidisciplinary
H. Xu, J. Shen, C. -T. Yang, B. Thierry, Y. Zhu, C. B. Mao, X. Zhou
Summary: An ultrasensitive naked-eye counting strategy was developed for quantifying AIV using phage-GNP probes, with a sensitivity down to 50 PFU/mL and potential application for pathogenic viruses like SARS-CoV-2.
MATERIALS TODAY ADVANCES
(2021)
Article
Chemistry, Analytical
Maria Lopez-Valls, Carmen Escalona-Noguero, Ciro Rodriguez-Diaz, Demian Pardo, Milagros Castellanos, Paula Milan-Rois, Carlos Martinez-Garay, Rocio Coloma, Melanie Abreu, Rafael Canton, Juan Carlos Galan, Rodolfo Miranda, Alvaro Somoza, Begona Sot
Summary: The COVID-19 pandemic highlights the necessity of fast and sensitive detection methods to prevent pathogen spread. In this study, the authors present CASCADE, a sensing system that allows rapid naked-eye detection of SARS-CoV-2 RNA. CASCADE utilizes LwaCas13a CRISPR protein and gold nanoparticles to recognize and visualize target RNA.
ANALYTICA CHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Edward J. Mitchell, Adam J. Beecroft, Jonathan Martin, Sally Thompson, Igor Marques, Vitor Felix, Paul D. Beer
Summary: By combining halogen bonding and coumarin fluorophore incorporation in acyclic host structural design, the first XB receptors capable of binding and sensing the hydrosulfide anion in pure water in a reversible chemosensing fashion have been demonstrated. These XB receptors exhibit characteristic selective quenching of fluorescence upon binding to HS-.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Anita Nehra, Apoorva Malik, Pragati R. Sharma, Sateesh Bandaru, Rakesh K. Sharma
Summary: A neutral electron-deficient, pentafluorophenyl hydrazone-functionalized calix[4]arene, R, was able to visually detect fluoride out of 19 anions. The formation of R + F- was confirmed by UV-vis, H-1 & F-19 NMR, and ESI-MS studies. Variable temperature NMR studies revealed the formation of HF2-. DFT and TD-DFT studies demonstrated strong binding interactions between R and F-.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Analytical
Subbiah Ramesh, Sudalaiyandi Kumaresan
Summary: By developing a coumarin-based naked-eye colorimetric sensor, selective detection of CN- has been achieved in pure aqueous solution with a color change indication. Based on absorption and emission spectral studies, the lowest detection limit of cyanide ion can be estimated accurately.
MICROCHEMICAL JOURNAL
(2021)
Article
Chemistry, Organic
Yong-Xue Li, Min Xue, Yong Yang
Summary: A novel molecular cage with a shape-persistent cavity wrapped by aromatic rings was successfully synthesized via efficient SNAr reactions. X-ray analysis confirmed the encapsulation of two THF molecules in the central cavity, enabling selective sensing of F- ions in apolar solvent with a visible color change. The addition of CH3OH could reverse the color back to its original state.
Article
Chemistry, Multidisciplinary
Stephan Hagspiel, Felipe Fantuzzi, Merle Arrowsmith, Annalena Gaertner, Maximilian Fest, Jonas Weiser, Bernd Engels, Holger Helten, Holger Braunschweig
Summary: The reaction of a cyclic alkyl(amino)carbene (CAAC)-stabilized thiazaborolo[5,4-d]thiazaborole (TzbTzb) with strong Bronsted acids results in the protonation of both TzbTzb nitrogen atoms. The coordination of counteranions or solvent molecules to the doubly protonated fused heterocycle via hydrogen-bonding interactions influences the visible and fluorescence colors of these salts. DFT calculations show that the hydrogen bonding affects the charge transfer character, enabling fine-tuning of absorption and emission spectral features.
CHEMISTRY-A EUROPEAN JOURNAL
(2022)
Article
Chemistry, Analytical
Jing-Lin He, Ling Tang, Shi-Qing Liao, Mei-Tong Guo, Ling Wu, Yinghui Song, Sulai Liu, Zhong Cao
Summary: A label-free platform utilizing target-triggered hybridization and inhibition of gold nanoparticle aggregation was developed for naked-eye detection of telomerase activity. This method offers a cost-effective approach for cancer diagnosis and identification of breast cancer phenotypes.
Article
Chemistry, Physical
Siniya Mondal, Venkata Surya Kumar Choutipalli, Bikash Kumar Jena, Venkatesan Subramanian, C. Retna Raj
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Review
Chemistry, Multidisciplinary
Sourav Mallick, C. Retna Raj
Summary: The growing demand for efficient energy storage devices has led to the emergence of rechargeable aqueous zinc-based battery technologies as a compelling alternative to lithium-based batteries. However, challenges such as cathode dissolution and dendrite formation still need to be addressed in zinc-ion batteries.
Review
Nanoscience & Nanotechnology
Aniruddha Kundu, Sourav Mallick, Santanu Ghora, C. Retna Raj
Summary: This article highlights the importance of nonprecious metal oxygen electrocatalysts in electrochemical energy conversion and storage technologies, as well as the emerging trends and advantages of these catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Aniruddha Kundu, Arpan Samanta, C. Retna Raj
Summary: The article demonstrates a facile method for synthesizing nitrogen-doped carbon nanotube-encapsulated Co0.25Ni0.75 alloy electrocatalyst, which shows excellent catalytic activity for oxygen reduction and oxygen evolution reactions, making it suitable for air cathode in metal-air batteries.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Electrochemistry
Raj Kumar Bera, Hongjun Park, Ryong Ryoo
Summary: This study reports the formation of Co nanoparticles and thin NC supported on 3DHPGC, showing excellent ORR/OER electrocatalytic activity and high durability. The Co-NC/3DHPGC enhances the dispersion of Co nanoparticles through a hierarchical porous structure, while demonstrating high energy density and efficiency in ZnAB.
Article
Nanoscience & Nanotechnology
Siniya Mondal, Mopidevi Manikanta Kumar, C. Retna Raj
Summary: Surface engineering of catalysts by dealloying can improve catalytic activity, as demonstrated by the synthesis of a low-Pt content CuxPty bimetallic electrocatalyst for oxygen reduction and formic acid oxidation. The electrochemically dealloyed catalysts show enhanced activity and have potential for commercial applications.
ACS APPLIED NANO MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Mopidevi Manikanta Kumar, C. Retna Raj
Summary: In this study, a nitrogen and phosphorus dual-doped mesoporous carbon-encapsulated iron phosphide nanostructure was synthesized, and its multifunctional electrocatalytic activity towards various reactions in renewable energy technologies was demonstrated. The material showed excellent performance in zinc-air batteries and alkaline water-splitting applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Debanjali Ghosh, Mopidevi Manikanta Kumar, C. Retna Raj, Debabrata Pradhan
Summary: In this study, CeO2 nanospheres embedded in NiO nanoflakes were synthesized and demonstrated to have bifunctional activity for the oxygen evolution reaction and oxygen reduction reaction (OER/ORR). The CeO2/NiO-2 nanocomposite showed outstanding OER/ORR activity and stability compared to other compositions and benchmark catalysts. The unique morphology of CeO2 nanospheres embedded in NiO nanoflakes facilitated the exposure of active sites with the bifunctional nature of the catalyst. The electronic synergy between CeO2 and NiO contributed to the formation of oxygen vacancy defects and accessible active sites.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Sourav Mallick, Venkata Surya Kumar Choutipalli, Saheb Bag, Venkatesan Subramanian, C. Retna Raj
Summary: The rational defect engineering of Mn-based spinel cathode materials by metal-ion doping and vacancy creation improves the performance and cycling stability of aqueous rechargeable zinc-ion batteries. The defect-engineered ternary spinel cathode based on Zn, Ni, and Mn shows enhanced Zn2+ ion storage performance with a specific capacity as high as 265 mAh g(-1), and a 2-fold enhancement in specific capacity after 5000 cycles.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Electrochemistry
Biraj Kanta Satpathy, C. Retna Raj, Debabrata Pradhan
Summary: The development of low-cost and earth-abundant efficient electrocatalysts is an effective strategy to enhance the activity of the oxygen evolution reaction (OER). In this study, a facile method was used to synthesize the CS/gCN nanocomposite, which exhibited excellent OER activity.
ELECTROCHIMICA ACTA
(2022)
Review
Chemistry, Multidisciplinary
Loknath Thapa, C. Retna Raj
Summary: The electrochemical activation of dinitrogen for ammonia synthesis is a topic of increasing interest. However, the faradaic efficiency and ammonia yield achieved so far are not suitable for industrial-scale production. The challenges include the competing hydrogen evolution reaction and poor nitrogen solubility. To improve efficiency, various electrolyte engineering strategies have been proposed, including pH control, proton transport velocity manipulation, and use of different electrolyte media. Promising results have been achieved with hybrid and non-aqueous electrolytes, but further research is needed to address the remaining challenges.
Article
Engineering, Electrical & Electronic
Joydeep Mahato, C. Retna Raj, Karabi Biswas
Summary: This article proposes a low-noise portable potentiostat circuit for the simultaneous detection and quantification of arsenic, mercury, and copper in water at the ppb level. The circuit does not require external devices or dedicated software and its reliability is verified by comparison with a commercial potentiostat.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Proceedings Paper
Materials Science, Multidisciplinary
R. Gukendran, M. Sambathkumar, C. Sabari, C. R. Ranjith Raj, V. Ranjeeth Kumar
Summary: This study investigates the performance of different types of composite materials in wind turbine blades. Using ANSYS Workbench, the deformation, stress, and strain energy of the composite materials under different load conditions are tested and analyzed.
MATERIALS TODAY-PROCEEDINGS
(2022)
Article
Green & Sustainable Science & Technology
Hongjun Park, Raj Kumar Bera, Ryong Ryoo
Summary: By loading iodine (I-2) in the nanopores of 3D graphene-like carbon (3DGC), the resulting I-2/3DGC electrode shows excellent performance in Zn-based battery and BSH applications. The high reversibility of I-2 and supercapacitance of 3DGC contribute to the ultrahigh energy and power densities, while the confinement of I-2 in the micropores ensures high cyclic stability in both battery and supercapacitor modes.
ADVANCED ENERGY AND SUSTAINABILITY RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Abhirup Bhadra, Aniruddha Kundu, C. Retna Raj
Summary: The electrochemical detection of Cr(VI) using surface-engineered mesoporous carbon-based material was demonstrated in this study. The modified electrode showed excellent sensitivity, selectivity, and stability, with a low detection limit and wide linear range. The porous nature of the material facilitated mass transport and electron transfer kinetics for efficient reduction of Cr(VI) at a favorable potential.
JOURNAL OF CHEMICAL SCIENCES
(2021)
