Article
Chemistry, Multidisciplinary
Chi Zhang, Soumik Siddhanta, Debadrita Paria, Yaozheng Li, Chao Zheng, Ishan Barman
Summary: A novel nano-PROD platform has been developed for molecular recording by probing vibrational modes of membrane constituents, sustaining live cells in near-physiological conditions and enabling surface-enhanced Raman spectroscopy analysis of specific cell surface markers. This platform shows promise for a range of applications due to its tunability and unique combination of nanoscale topographic features and molecular sensing capabilities.
Article
Chemistry, Multidisciplinary
Vladimir G. Dubrovskii, Simon Escobar Steinvall, Virginie de Mestral, Rajrupa Paul, Jean-Baptiste Leran, Mahdi Zamani, Elias Z. Stutz, Anna Fontcuberta Morral
Summary: Selective area growth of Zn3P2 on InP provides high-quality semiconductor nanostructures made of earth-abundant elements. In the precoalescence stage, Zn3P2 emerges in the form of nanoislands and undergoes a shape transformation. The results are presented in dimensionless variables, allowing simultaneous understanding of islands grown in differently sized pinholes and for different growth times.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Nanoscience & Nanotechnology
Yimin Fan, Tao Zhang, Zubo Cai, Dongxian Li, Weisheng Yue, Tiancheng Gong, Yunfei Luo, Ping Gao
Summary: Arrays of gold-silver bimetallic nanopillars were fabricated using surface-plasmon lithography and their enhancement properties as surface-enhanced Raman scattering substrates were studied. The nanopillars showed a good response in the detection of methylene blue molecules at a low concentration. The Au-Ag bimetallic coating exhibited higher SERS enhancement compared to pure Au or Ag coatings. This study demonstrates the potential of the fabricated SERS substrates for detecting biochemical molecules at trace levels, and surface-plasmon lithography as a promising method for fabricating SERS substrates.
Article
Materials Science, Coatings & Films
Kuan-Syun Wang, Zi-Ling Tseng, Chih-Yi Liu, Tsai-Yu Kuan, Ru-Jong Jeng, Ming-Chien Yang, Yuh-Lin Wang, Ting-Yu Liu
Summary: A new flexible, super-hydrophobic, and highly sensitive PDMS-based substrate was developed for SERS detection by depositing organic conjugated molecules films and Au nanoislands. The Au@DFH-4T nanostructure with a hydrophobic ivy-like nanostructure showed excellent performance in detecting hydrophobic molecules at ultralow concentrations. The flexible SERS sensor exhibited efficiency and durability after bending tests.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Chemistry, Physical
Mathias Charconnet, Christian Kuttner, Javier Plou, Juan Luis Garcia-Pomar, Agustin Mihi, Luis M. Liz-Marzan, Andreas Seifert
Summary: This study demonstrates the fabrication of superlattices by templated self-assembly of gold nanoparticles on a flexible support, with tunable lattice-plasmon resonances by means of macroscopic strain. It shows that the highest SERS performance is achieved by matching the lattice plasmon mode to the excitation wavelength, by post-assembly fine-tuning of long-range structural parameters. Both asymmetric and symmetric lattice deformations can be used to adapt a single lattice structure to both red-shifted and blue-shifted excitation lines.
Article
Chemistry, Multidisciplinary
Alejandro Vidal, Sergio Molina-Prados, Ana Cros, Nuria Garro, Manuel Perez-Martinez, Raquel Alvaro, Gadea Mata, Diego Megias, Pablo A. Postigo
Summary: An easy and low-cost method for fabricating monometallic Au nanoislands for plasmonic enhanced spectroscopy is presented. This method involves direct thermal evaporation of Au on glass substrates, followed by a thin layer of silicon dioxide. The fabricated nanoislands exhibit strong plasmon resonances in the visible range, and have been shown to enhance fluorescence and Raman scattering measurements.
Article
Spectroscopy
Manish Nath Tripathi, Poonam Jangir, Suyash Aakriti, Suyash Rai, Mayank Gangwar, Gopal Nath, Preeti S. Saxena, Anchal Srivastava
Summary: A biosensor based on surface-enhanced Raman scattering (SERS) has been developed for the quick, accurate, and timely diagnosis of the Zika virus. The sensor exhibits a high limit of detection and linear range, offering a significant improvement over clinical diagnosis approaches.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Biochemistry & Molecular Biology
Fahad M. M. Aldosari
Summary: This study investigated the size dependency of gold nanoparticles (AuNPs) on their surface-enhanced Raman scattering (SERS) activity by using labeled AuNPs. The results showed that the SERS signal increases with the increasing size of AuNPs, and the preferred candidates for Raman labelling of spherical gold within the range of 5 nm to 100 nm are BPT and 4-AATP.
Article
Chemistry, Inorganic & Nuclear
Pablo Orus, Fabian Sigloch, Soraya Sangiao, Jose Maria De Teresa
Summary: Ga+ Focused Ion Beam Induced Deposition (FIBID) is a nanopatterning technique that utilizes a focused beam of Ga+ ions to locally induce the decomposition of a gaseous precursor material. By stacking individual patterns, growth along the vertical direction can be achieved, resulting in nanopillars with heights up to 10 μm and potential applications in the design of 3D superconducting devices.
JOURNAL OF SOLID STATE CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jiacheng Yao, Hui Fang, Yong Li, Ze Liu, Hongxing Xu, Tao Ding
Summary: In this study, single-crystalline aluminum nanowires with high stability were fabricated using a superplastic nanomolding technique. These nanowires exhibit multimode waveguiding, efficient beam splitting based on polarization, and durable thermal optical modulation, making them suitable for nanophotonic routers, splitters, and information encryptors. This technique can also be extended to other metals, enhancing the development of functional nanophotonic devices and integrated optical chips.
Article
Biochemistry & Molecular Biology
Nikita Shandyba, Sergey Balakirev, Vladislav Sharov, Natalia Chernenko, Danil Kirichenko, Maxim Solodovnik
Summary: This paper presents experimental studies on the effect of Ga-focused ion beam (FIB) surface modification on Si(111) on the growth of GaAs nanowires (NWs). The authors observed three different modes of surface features on the GaAs NW growth based on the dose of Ga ions during surface modification. At low doses, NW growth is suppressed, while high-density GaAs NW arrays with a high fraction of vertically aligned nanowires are achieved at medium doses. At high doses, a continuous polycrystalline base with misoriented and thin GaAs NWs is formed. The interaction between the implanted Ga ions and the surface plays a key role in the modification and growth processes.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Xiaofei Xiao, Raymond Gillibert, Antonino Foti, Pierre-Eugene Coulon, Christian Ulysse, Tadzio Levato, Stefan A. . Maier, Vincenzo Giannini, Pietro Giuseppe Gucciardi, Giancarlo Rizza
Summary: Surface-enhanced Raman optical activity (SEROA) has been extensively studied for its ability to directly probe the stereochemistry and molecular structure. This study presents a strategy for achieving a similar effect by coupling optically inactive molecules with the chiral plasmonic response of metasurfaces, resulting in a surface-enhanced Raman polarization rotation effect. This technique extends the potential of Raman optical activity to inactive molecules and enhances the sensitivity performances of surface-enhanced Raman spectroscopy, without the heating issue present in traditional plasmonic-enhanced ROA techniques.
Article
Chemistry, Multidisciplinary
Meitong Nie, Yuming Zhao, Wonil Nam, Junyeob Song, Wenqi Zhu, Henri J. Lezec, Amit Agrawal, Wei Zhou
Summary: The research introduces nanolaminate plasmonic nanocavities on 3D vertical nanopillar arrays for broadband SERS operation with large enhancement factors. It shows uniform SERS performance and demonstrates nanoscale broadband SERS operation at the single MIM nanocavity level. Numerical studies reveal that the nanolaminate plasmonic nanocavities can support multiple hybridized plasmonic modes for concentrating optical fields across a broadband wavelength range.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Nikita Shandyba, Danil Kirichenko, Vladislav Sharov, Natalia Chernenko, Sergey Balakirev, Maxim Solodovnik
Summary: A novel phenomenon is revealed after self-catalytic growth of GaAs nanowires (NWs) on Ga focused ion beam (FIB) treated Si(111) substrates. The growth of GaAs NWs and nanocrystals is suppressed at an ion dose of around 0.1 pCμm-2, but further increase in ion dose stimulates crystal growth, leading to the formation of extremely thin NWs with a high surface density.
Article
Nanoscience & Nanotechnology
Mathew K. Francis, Binaya Kumar Sahu, P. Balaji Bhargav, C. Balaji, Nafis Ahmed, A. Das, Sandip Dhara
Summary: Silver nanowires were synthesized using the hydrothermal method, and the length of the nanowires was controlled by adjusting the concentration of AgNO3. The morphological, structural, and optical properties of the nanowires were studied, and their potential as surface-enhanced Raman scattering substrates was explored, achieving significant enhancement.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Energy & Fuels
Kamal Kumar, Abhijit Das, Uttam Kumar Kumawat, Anuj Dhawan
Summary: A triple-junction tandem organic solar cell with polymer active materials was presented, showing improved performance by introducing plasmonic nanospheres over the top electrode. Aluminum nanospheres were found to enhance light trapping, leading to a 14% improvement in overall short circuit current density.
ENERGY SCIENCE & ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Ajay Kumar Agrawal, Akanksha Ninawe, Anuj Dhawan
Summary: This paper reports a significantly improved sensing response of a plasmonic sensor based on a nanopillar array separated from a thin film, operated using the Kretschmann configuration. The sensor shows high sensitivity and figure of merit for both localized and bulk sensing responses. It can be easily fabricated and has great potential for biosensing applications.
IEEE SENSORS JOURNAL
(2022)
Article
Optics
Yashna Sharma, Anuj Dhawan
Summary: This study proposes active near-field plasmonic switches based on a Sierpinski-fractal contour-bowtie plasmonic nanoantenna on top of a VO2 thin film. The near-field intensity of the switch can be controlled by the phase change of VO2, leading to a switch from an OFF state to an ON state. The intensity switching ratio (ISR) of the switch can be quantified, and simulations show that higher fractal orders of the nanoantenna result in higher ISR values.
Article
Engineering, Electrical & Electronic
Abhijit Das, Ajay Kumar Agrawal, Nitin Gupta, Anuj Dhawan
Summary: In this paper, a fabrication method for LSPR sensor chips consisting of crystalline gold nanoparticles is demonstrated. The crystalline AuNPs are grown on a heated silica substrate through thermal evaporation, and nanoparticles with thickness up to 40 nm are successfully formed. This new fabrication method provides a greater potential for the performance of LSPR sensors.
IEEE SENSORS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Rajib Ratan Ghosh, Anuji Dhawan
Summary: Programmable integrated photonics is an emerging research field that utilizes phase change materials (PCMs) with non-volatile properties as the active layer for programmable photonics. In this work, hybrid device architectures utilizing the non-volatile properties of PCMs on a Si3N4 platform are investigated, and non-volatile reconfigurable reflector switches and 1x2 mode converter switches are proposed. These optical switches offer advantages such as low loss, small size, broadband operation, and low cross talk, making them suitable for applications in optical communication systems and nanophotonics.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Yilu Zhou, Farzad Mohaddes, Courtney Lee, Smriti Rao, Amanda C. Mills, Adam C. Curry, Bongmook Lee, Veena Misra
Summary: This article presents a high-performing wearable ECG armband with miniaturized hardware and data storage and wireless communication capabilities. It evaluates different electrode configurations and proposes an improved design of an electronic textile armband. The system provides real-time and noise-resilient ECG data without interrupting daily life and can be implemented in use cases that require continuous ECG monitoring.
IEEE SENSORS JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Akanksha Ninawe, Anuj Dhawan
Summary: This paper presents the numerical investigation of several complex plasmonic nanostructures for SEIRA spectroscopy-based substrates. The proposed nanostructures exhibit substantially large SEIRA enhancement factor compared to previously reported enhancement factor values. The plasmonic properties of the proposed nanostructures have been studied and the highest SEIRA enhancement occurs at a wavelength of 6800 nm.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Engineering, Electrical & Electronic
Rajib Ratan Ghosh, Anuj Dhawan
Summary: In this paper, novel architectures for non-volatile directed logic circuits are presented. These circuits demonstrate low insertion losses, high extinction ratios, as well as multi-bit and broadband operations. The non-volatile switching operations are performed using a non-volatile phase change material, controlled by electro-thermal switching. The study provides a practical technique to design future high-speed nanoscale non-volatile photonic integrated circuits for logic computing applications.
IEEE JOURNAL OF QUANTUM ELECTRONICS
(2023)
Proceedings Paper
Engineering, Multidisciplinary
Emran K. Ashik, Sundar B. Isukapati, Hua Zhang, Tianshi Liu, Utsav Gupta, Adam J. Morgan, Veena Misra, Woongje Sung, Ayman Fayed, Anant K. Agarwal, Bongmook Lee
Summary: The reliability of n- and p-MOSFETs on 4H-SiC was studied under different gate oxide conditions. The results show that the threshold voltage shift for n-MOSFET is less than 0.5V after 10(5)s at +25V, while p-MOSFET shows a larger shift of -1.9V after 10(5)s at -25V and 150 degrees C for ultrathin + thick CVD oxide. It was also found that the reliability of p-MOSFETs improves with ultrathin + CVD oxides compared to thermally grown oxides.
2022 IEEE INTERNATIONAL RELIABILITY PHYSICS SYMPOSIUM (IRPS)
(2022)
Article
Optics
Yashna Sharma, Enes Dakmak, Hsiang-Kuo Yuan, Roberto Garcia, Dale Batchelor, Tuan Vo-dinh, Tushar Ghosh, Anuj Dhawan
Summary: We describe voltage-controlled surface-enhanced Raman scattering (SERS) substrates that can actively modulate SERS signals by applying voltage. These substrates employ a dielectric electroactive polymer (D-EAP) membrane with electrically-actuated active regions. Activation of these regions induces contractile strain in the SERS dye-coated nanoparticle areas of the D-EAP, resulting in enhanced SERS signals.
Article
Chemistry, Multidisciplinary
Abhijit Das, Nitin Gupta, Ajay Kumar Agrawal, Anuj Dhawan
Summary: This paper presents a method for fabricating plasmonic nanostructures over a large area for use as SERS substrates, with batch processes that can produce large numbers of substrates in a single run. The effects of different process parameters were studied to optimize sensitivity for molecule detection as low as 100 nM. The fabricated SERS substrates were also evaluated for uniformity and reproducibility, and successfully applied for label-free detection of organophosphorous pesticides.
Article
Materials Science, Multidisciplinary
Ajay Kumar Agrawal, Abhijit Das, Nitin Gupta, Kamal Kumar, Anuj Dhawan
Summary: This paper presents plasmonic switches based on vanadium dioxide (VO2) and gold nanoparticles (Au NPs) that exhibit enhanced switching of optical transmission as the temperature increases. The operating wavelength of the switch can be tuned between 650 and 1000 nm using the localized surface plasmon resonance properties of the Au NPs.
ADVANCED PHOTONICS RESEARCH
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Tahmid Latif, James Dieffenderfer, Akhilesh Tanneeru, Bongmook Lee, Veena Misra, Alper Bozkurt
Summary: Wearable devices have the potential to improve asthma care by monitoring environmental conditions such as ozone concentration, while enclosure design and material selection are crucial for ensuring stable sensor operation.
Proceedings Paper
Engineering, Electrical & Electronic
Bongmook Lee, Michael Lim, Veena Misra
Summary: This study introduces a battery-powered wearable monitoring system for measuring VOCs emitted from human skin, capable of distinguishing between different lifestyle-related VOC levels, allowing for real-time monitoring and personalized exposure tracking.
Article
Engineering, Electrical & Electronic
Viswanath Padmanabhan Ramesh, Yasaman Sargolzaeiaval, Taylor Neumann, Veena Misra, Daryoosh Vashaee, Michael D. Dickey, Mehmet C. Ozturk
Summary: Flexible thermoelectric generators have been developed in this study to efficiently convert body heat into electrical energy, using low thermal conductivity aerogel-silicone composite and stretchable eutectic gallium-indium liquid metal interconnects. The results show promising potential for these wearable devices to serve as the main energy source for low-power health monitoring electronics.
NPJ FLEXIBLE ELECTRONICS
(2021)
