Article
Nanoscience & Nanotechnology
Zachary R. Lawson, Arin S. Preston, Matiyas T. Korsa, Nathaniel L. Dominique, Walker J. Tuff, Eli Sutter, Jon P. Camden, Jost Adam, Robert A. Hughes, Svetlana Neretina
Summary: This article demonstrates an assembly route for the fabrication of aligned plasmonic gold trimers with air-filled vertical nanogaps, exceeding the spatial controls of standard lithographic techniques. By utilizing specific process steps and control measures, precise positioning of nanogaps and metal assembly, as well as characterization of the optical response of the structures, were achieved.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Spectroscopy
Gokhan Dikmen
Summary: Although amoxicillin is used as an antibacterial drug in some foods, its use in the food industry is prohibited. Therefore, rapid and sensitive detection of amoxicillin at ultra-low concentration is crucial. In this study, silver nanocubes were synthesized and used as a surface enhanced Raman scattering (SERS) active substrate for the detection of amoxicillin. The synthesized Ag NCs exhibited excellent sensitivity and dynamic linear regression over a wide range of concentrations. Additionally, the SERS substrate showed good recyclability, reproducibility, and chemical stability, making it a potential tool for detecting amoxicillin at ultra-low concentrations.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Review
Chemistry, Analytical
Sarjana Yadav, Sneha Senapati, Samir Kumar, Shashank K. Gahlaut, Jitendra P. Singh
Summary: Glancing angle deposition (GLAD) is a technique for fabricating sculpted micro- and nanostructures with high sensitivity and enhanced optical and catalytic properties. GLAD-based nanostructures have broad applications in sensing, especially in the biomedical field. This review discusses the effects of morphology and deposition conditions on GLAD structures, their biosensing capability, and their use in various biosensing applications.
Article
Optics
Laishram Thoibileima Chanu, Naorem Khelchand Singh
Summary: A well-aligned vertical nickel oxide nanowire was fabricated using glancing angle deposition through electron-beam evaporation at room temperature. After annealing, an increase in crystallite size, a decrease in lattice strain and dislocation density, and an increase in particle size of the nanowire were observed. Photoluminescence emission experiments showed a decrease in defect-related transitions and a broadening of emission peaks after annealing.
JOURNAL OF LUMINESCENCE
(2023)
Article
Engineering, Electrical & Electronic
Vinit Kumar Yadav, Amitabha Nath, Abhijit Das, Julaiba Tahsina Mazumder, Mitra Barun Sarkar
Summary: Enhanced photosensing performance was reported for Indium nanoparticles capped TiO2 nanowire array using GLAD technique, showing high ideality factor and improved photoresponsivity. The ON/OFF switching irradiation for the In NPs based photosensor increased with quick rise and fall times.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Ngasepam Monica Devi, Stacy Anastacia Lynrah, Rajshree Rajkumari, Naorem Khelchand Singh
Summary: This study successfully synthesized silver nanoparticles decorated SiOx nanowire arrays on silicon substrates using the GLAD technique. The resulting structures showed a significant enhancement in optical absorption, defect-related emissions in the UV-vis region, and exhibited properties of a Schottky diode. The device also demonstrated low turn-on voltages, high responsivity, detectivity, EQE, and an enhanced photocurrent to dark current contrast ratio, making it a promising candidate for various applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Review
Chemistry, Multidisciplinary
Jang-Hwan Han, Doeun Kim, Juhwan Kim, Gyurin Kim, Peer Fischer, Hyeon-Ho Jeong
Summary: Physical shadow growth is a vacuum deposition technique that allows the fabrication of various 3D-shaped nanoparticles and structures using a wide range of materials. Recent advancements in controlling the shadow effect at the nanoscale has expanded the capabilities of nanomaterials to include complex 3D-shaped hybrid nanoparticles and structures. By engineering the shape and material composition, plasmonically active nanomaterials with unique physical and chemical properties can be created. This review discusses the recent progress in the development of shadow growth techniques for hybrid plasmonic nanomaterials, describing how fabrication enables engineered material responses and highlighting novel functions. Potential applications in photonic devices, biomedicine, and chiral spectroscopy are also discussed.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Marcio A. Correa, Armando Ferreira, Raphael M. Tromer, Leonardo D. Machado, Matheus Gamino, Sergio A. N. Franca Junior, Felipe Bohn, Filipe Vaz
Summary: ZnO and doped ZnO films are commonly used as biosensor elements, with room-temperature ferromagnetic behavior observed in all studied samples, including pure ZnO. Computational simulations were used to investigate the origin of ferromagnetism, revealing the influence of vacancy dynamics and columnar geometry on the magnetic properties of the films. This study highlights the potential for inducing/exploring room-temperature ferromagnetism in non-ferromagnetic metal-doped semiconductors for biosensor applications.
Article
Nanoscience & Nanotechnology
Abdul Rasheed Paloly, M. Junaid Bushiri
Summary: The study introduced a facile method for preparing Ag/SnO2 nano-obelisk arrayed thin films, showcasing broad antireflective properties and excellent SERS performance. These films hold promise for practical sensing applications.
Review
Environmental Sciences
Sintayehu Leshe Kitaw, Yihenew Simegniew Birhan, Hsieh-Chih Tsai
Summary: Surface-enhanced Raman scattering spectroscopy (SERS) is a powerful vibrational spectroscopy technique that utilizes the inelastic scattering of photons by molecules. It has unique properties such as ultra-sensitivity, selectivity, non-destructivity, speed, and fingerprinting properties, making it widely used in sample analysis and plasmonic mechanistic studies. However, the high cost and low reproducibility of SERS signals limit its practical applications. The development of multifunctional, stable, and reusable nano-engineered SERS substrates provides a feasible solution to overcome these limitations.
ENVIRONMENTAL RESEARCH
(2023)
Article
Chemistry, Physical
Kseniya V. Serebrennikova, Nadezhda S. Komova, Arseniy V. Aybush, Anatoly V. Zherdev, Boris B. Dzantiev
Summary: Surface-enhanced Raman scattering (SERS) is an efficient technique for detecting pesticide residues, providing high sensitivity and fingerprint specificity. A flexible SERS substrate composed of cellulose fiber (CF) modified with silver nanostructures (AgNS) was developed. The substrate exhibited excellent SERS performance and was able to detect trace hazardous substances such as malathion. The characteristics of the substrate make it a potential label-free and ready-to-use sensing platform for SERS detection.
Article
Biochemistry & Molecular Biology
Yaxin Wang, Aonan Zhu, Xiaolong Zhang, Yongjun Zhang
Summary: Colloidal lithography is employed to fabricate square-shaped and cone-shaped Au nanostructures, with control of unit spacing by adjusting Au deposition time to achieve enhanced local field, leading to detection limit down to 5 pg/mL for liver cancer marker AFP.
Article
Spectroscopy
Nguyen Tran Truc Phuong, Thi Xoan Hoang, Nguyen La Ngoc Tran, Lam Gia Phuc, Viet-Duc Phung, Hanh Kieu Thi Ta, Ta Ngoc Bach, Nhu Hoa Thi Tran, Kieu The Loan Trinh
Summary: The use of dye in food is harmful to human health and prohibited, but still exists due to benefits like cheap prices and abundant resources. Research shows that surface-enhanced Raman scattering (SERS) is a powerful technique for sensitive detection of ultra-low concentration Rhodamine B, thus aiding in preventing health risks to human.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Materials Science, Multidisciplinary
Hannah-Noa Barad, Mariana Alarcon-Correa, Gerardo Salinas, Eran Oren, Florian Peter, Alexander Kuhn, Peer Fischer
Summary: This study presents an integrated fabrication scheme based on glancing angle physical vapor deposition to form a thin-film materials library with controlled variations in nanoshape, multinary composition, and oxidation state on a single large area substrate. The versatility of the method was demonstrated by growing an octonary materials system and revealing variations in several physico-chemical properties. The scheme can be extended to include more starting elements and transferred to other deposition methods, making it an adaptable and versatile platform for combinatorial materials science.
Article
Nanoscience & Nanotechnology
Rajnarayan De, S. Maidul Haque, M. K. Sikdar, P. K. Sahoo, K. Divakar Rao
Summary: The study utilized a modified glancing angle deposition (GLAD) technique to prepare single-sided TiO2 thin films, with an additional flux collimation plate introduced to enhance the collimation of depositing vapour flux. The reduction in TiO2 film refractive index was observed with increasing distance from the vapour source, resulting in excellent anti-reflection properties in coatings deposited at distant positions. The research demonstrates the lowest refractive index of TiO2 achieved together with the fabrication of a TiO2-based broadband single-layer anti-reflection coating.
Article
Physics, Fluids & Plasmas
Laxman Prasad Goswami, Srimanta Maity, Devshree Mandal, Ayushi Vashistha, Amita Das
Summary: This paper investigates a novel ponderomotive pressure-driven mechanism for exciting electrostatic waves in overdense magnetized plasma utilizing a finite laser pulse. Particle-in-cell simulations were used to study the interaction between the laser pulse and the plasma medium, with observed spatial separation of R and L pulses and excitation of electrostatic perturbations associated with the laser pulses.
PLASMA PHYSICS AND CONTROLLED FUSION
(2021)
Article
Physics, Fluids & Plasmas
Srimanta Maity, Devshree Mandal, Ayushi Vashistha, Laxman Prasad Goswami, Amita Das
Summary: This study explores the mechanism of harmonic generation in magnetized plasma in O- and X-mode configurations using particle-in-cell simulations, showing an increase in efficiency with incident laser intensity and a dependency on magnetic field strength. The findings demonstrate an optimal magnetic field value for maximizing harmonic generation efficiency, providing a mechanism for laser energy propagation within overdense plasma regions.
JOURNAL OF PLASMA PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Sathi Das, Kanchan Saxena, Laxman Prasad Goswami, Jampana Gayathri, Dalip Singh Mehta
Summary: A porous Ag-TiO2 film with a nanocage-like structure was fabricated as a sensitive, recyclable, and low-cost SERS substrate using facile methods. The substrate demonstrated high sensitivity and accuracy in catalyzing dye degradation and detecting urea.
Article
Physics, Multidisciplinary
Laxman Prasad Goswami, Trishul Dhalia, Rohit Juneja, Srimanta Maity, Sathi Das, Amita Das
Summary: This study demonstrates the parametric process of Brillouin scattering in magnetized plasma targets using one-dimensional Particle-in-cell simulations. The excitation of this scattering process and its nonlinear regime are investigated in the presence of an external magnetic field.
Article
Nanoscience & Nanotechnology
Sathi Das, Kanchan Saxena, Jean-Claude Tinguely, Arijit Pal, Nima L. Wickramasinghe, Abdolrahman Khezri, Vishesh Dubey, Azeem Ahmad, Vivekanandan Perumal, Rafi Ahmad, Dushan N. Wadduwage, Balpreet Singh Ahluwalia, Dalip Singh Mehta
Summary: Antimicrobial resistance (AMR) is a global health threat. Surface-enhanced Raman spectroscopy (SERS) can be used for real-time and sensitive detection of bacteria, providing a promising solution for culture-free bacterial detection.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Trishul Dhalia, Rohit Juneja, Laxman Prasad Goswami, Srimanta Maity, Amita Das
Summary: In this study, particle-in-cell simulations are used to investigate the harmonic generation of electromagnetic waves in a magnetized plasma. Odd higher harmonics of linearly polarized waves are excited, with the maximum harmonic generation occurring when the incident wave frequency matches the electron cyclotron frequency. No harmonics are excited when the incident wave has circular polarization. These studies show that by carefully adjusting plasma parameters, higher frequency EM waves with the desired circular polarization can be generated.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Proceedings Paper
Engineering, Biomedical
Sathi Das, Vrishty Kundu, Arijit Pal, Kanchan Saxena, Vivekanandan Perumal, Dalip Singh Mehta
Summary: A rapid SERS detection method using microwave synthesized silver nanoparticles (NPs) was reported for bacterial DNA, which allows for quick identification of bacterial species and genomic content.
TRANSLATIONAL BIOPHOTONICS: DIAGNOSTICS AND THERAPEUTICS III
(2023)
Article
Chemistry, Multidisciplinary
Rakhi Grover, Ritu Srivastava, Kanchan Saxena
Summary: The thermal evaporation method is used to fabricate hybrid inorganic-organic LEDs, and the emission properties can be controlled by adjusting the thickness of the nanocrystalline CdTe film. CdTe nanocrystals with diameters ranging from 1.5 nm to 9 nm are formed on glass substrates using the thermal evaporation method. The organic light emitting diodes (OLEDs) based on these nanocrystals exhibit electroluminescence in the green to yellow region of the visible spectrum.
Article
Physics, Fluids & Plasmas
Srimanta Maity, Laxman Prasad Goswami, Ayushi Vashistha, Devshree Mandal, Amita Das
Article
Materials Science, Multidisciplinary
Sathi Das, Kanchan Saxena, Dalip Singh Mehta
Summary: This study presents a technique for fast, accurate, and molecular-specific detection of dyes at ultra-trace levels using surface-enhanced Raman spectroscopy (SERS). The researchers explored a highly sensitive Ag-TiO2 thin film with a nanocage structure for SERS applications. The fabricated SERS substrate effectively detected different dyes at low concentrations, demonstrating its potential for practical applications.
MATERIALS ADVANCES
(2022)
