Article
Nanoscience & Nanotechnology
Rishabh Rastogi, Hamed Arianfard, David Moss, Saulius Juodkazis, Pierre-Michel Adam, Sivashankar Krishnamoorthy
Summary: This study demonstrates the crucial impact of EM hot-spots on molecular detection sensitivity in plasmonic nanopillar arrays. Results show that the analyte dimensions have a significant influence on the sensitivity of hot-spots, and that fluorescence detection has advantages over Raman detection when facing spatial limitations.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Chih-Feng Wang, Patrick Z. El-Khoury
Summary: The study reveals that nonlinear optical processes can be enhanced at plasmonic tip-sample nanojunctions, allowing for high-spatial-resolution chemical analysis through enhanced spectroscopies.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Applied
Yinshuang Song, Hai-Cai Huang, Wenhui Lu, Nianlu Li, Jie Su, Shi-Bo Cheng, Yongchao Lai, Jing Chen, Jinhua Zhan
Summary: This study developed novel SERS substrates using monodispersed tungsten disulfide quantum dots modified silver nanospheres (Ag@WS(2)QD) for rapid and sensitive analysis of toxic agrochemicals. Ag@WS(2)QD showed uniform and stable SERS signals within 2 minutes, with a 4 times higher analytical enhancement factor compared to unmodified colloidal silver nanoparticles. Enhanced charge transfer and unique surface properties contribute to the rapid and sensitive SERS detection using Ag@WS(2)QD.
Article
Materials Science, Multidisciplinary
Limei Liu, Pablo Martinez Pancorbo, Ting-Hui Xiao, Saya Noguchi, Machiko Marumi, Hiroki Segawa, Siddhant Karhadkar, Julia Gala de Pablo, Kotaro Hiramatsu, Yasutaka Kitahama, Tamitake Itoh, Junle Qu, Kuniharu Takei, Keisuke Goda
Summary: Over the past two decades, wearable sensor technology has experienced significant growth. One recent breakthrough is the development of wearable chemical sensors based on surface-enhanced Raman spectroscopy (SERS), which can universally and noninvasively detect molecular fingerprints. However, these sensors are not scalable due to their complex fabrication process and limited multifunctional sensing capabilities. A highly scalable, wearable SERS sensor based on a low-cost, ultrathin, flexible, stretchable, adhesive, and biointegratable gold nanomesh is demonstrated in this study. It can be worn on any surface and used for label-free, large-scale, in situ sensing of diverse analytes. To showcase its practical utility, the sensor is tested for the detection of sweat biomarkers, drugs of abuse, and microplastics. This wearable SERS sensor represents a significant step towards the generalizability and practicality of wearable sensing technology.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Spectroscopy
M. Muthu Meenakshi, Gowri Annasamy, Mugesh Sankaranarayanan
Summary: The study proposes a highly sensitive technique for the trace amount detection of pesticidal residues in centella powder. A graphene oxide gold (GO-Au) nanocomposite coated parafilm is developed as a substrate to facilitate dual surface enhanced Raman signal. The parafilm coated with GO-Au nanocomposites shows better Raman signal enhancement and can detect chlorpyrifos down to 0.1 ppm in centella herbal powder samples. This parafilm-based GO-Au SERS substrate can be used as a screening tool in quality control of herbal product manufacturing sectors.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Physical
Yangkai Chen, Huan Li, Jianmei Chen, Dong Li, Mengyuan Zhang, Guanghua Yu, Lin Jiang, Yi Zong, Bin Dong, Zhoufang Zeng, Yandong Wang, Lifeng Chi
Summary: This study presents highly effective SERS substrates with self-generating nanogaps, achieving controlled high density hot spots. The emergence of multimode hot spots makes the SG SERS substrates superior in enhancement, uniformity, and reproducibility compared to traditional substrates. Therefore, SG SERS substrates can serve as excellent platforms for trace molecule detection in practical applications.
Article
Nanoscience & Nanotechnology
Xinkuo Zhang, Yalong Li, Zehong Lei, Yibin Yang, Lili Tao, Zhaoqiang Zheng, Xing Feng, Ji Zeng, Yu Zhao
Summary: A composite structure prepared by reducing Au nanoparticles on the surface of two-dimensional MoWS2 ternary alloys was used for label-free and highly sensitive detection of adenine based on the surface-enhanced Raman spectroscopy (SERS) technique. The AuNP/MoWS2 composite successfully detected rhodamine 6G molecules with a limit of detection (LOD) of 10(-11) M, as well as adenine with LODs of 10(-9) M in aqueous solution and 10(-8) M in simulated urine. The hybrid SERS substrate exhibited a good linear detection range for adenine and had excellent uniformity and reliable stability, suggesting its potential for applications in biological detection and clinical diagnosis.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Analytical
Chuhong Zhu, Qiangsheng Zhao, Xiujuan Wang, Zhongbo Li, Xiaoye Hu
Summary: In this study, a functional SERS system was developed for sensitive detection of target analytes using concentration of analyte molecules on or nearby plasmonic nanostructures. The composite film of Ag-nanocubes/graphene-oxide/Au-nanoparticles on a hydrophobic surface effectively accumulated analyte molecules for enhanced SERS activity. The system showed promising applications in food safety inspection and environmental pollutant monitoring.
MICROCHEMICAL JOURNAL
(2021)
Article
Materials Science, Multidisciplinary
Miao Yu, Qihang Tian, Guangyuan He, Kaimin Cui, Jihong Zhang
Summary: Surface-enhanced Raman scattering (SERS) is a novel method for low concentration molecular detection, and tapered fiber SERS probes based on silver nanocubes exhibit high sensitivity. These probes can be used for both qualitative and quantitative analysis, with an optimal cone angle of 8.3 degrees.
ADVANCED FIBER MATERIALS
(2021)
Article
Engineering, Environmental
Jiafeng He, Xian Li, Jumei Li
Summary: This study demonstrates a reliable surface-enhanced Raman scattering (SERS) substrate composed of graphene oxide (GO) nanosheets and silver nanocubes for sensitive detection of various organic contaminants. The SERS substrate shows highly uniform signals and low relative standard deviations, and is capable of label-free detection of complex organic pesticides.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Materials Science, Ceramics
Thi Ha Tran, Thi Mai Anh Nguyen, Vu Phuong Thao Dao, Cong Doanh Sai, Thanh Cong Bach, Nguyen Hai Pham, An Bang Ngac, Van Thanh Pham, Thi Kim Chi Tran, Hyeonsik Cheong, Viet Tuyen Nguyen
Summary: This study reports a facile process to fabricate CuO/Au core/shell nanowires, which show high sensitivity as SERS substrates capable of detecting methylene blue at concentrations as low as 10(-13) M. The major advantages of these SERS substrates are their sensitivity, uniformity, and purity without the presence of organic surfactants in the synthesis process.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Ying Luo, Qian Zhang, Qin Wang, Zhenglin Liu, Lingfeng Duan, Wenxi Cao, Zijin Cao, Caiqin Han
Summary: In this study, gold nanoparticles-modified silver nanorod arrays were used as surface-enhanced Raman spectroscopy (SERS) substrates. The coffee ring effect of the arrays was explored as a preconcentration method for target analytes. Methyl viologen, a toxic herbicide, was successfully determined using this method. The results suggest that the coffee ring on the arrays provides a promising way for monitoring environmental pollution and food safety caused by pesticides.
Article
Chemistry, Multidisciplinary
Eunji Lee, Sangwoo Ryu
Summary: This study introduces a simple and clean method for fabricating highly porous metal structures through high-pressure thermal evaporation, which leads to a highly porous, black colored structure of Au through control of homogeneous nucleation and growth. These porous structures demonstrate a higher intensity of surface-enhanced Raman spectroscopy (SERS) compared to commercial SERS substrates, showing promise for the development of low-cost, highly sensitive chemical sensors.
Article
Engineering, Electrical & Electronic
Katerina Hadjigeorgiou, Evdokia Kastanos, Costas Pitris, Chrysafis Andreou
Summary: Urinary Tract Infections (UTIs) are global bacterial infections that pose a burden on healthcare systems and citizens, making the development of fast and cost-effective Point-of-Care Testing (POCT) technologies crucial for UTI management. Surface-enhanced Raman Spectroscopy (SERS)-based sensors can directly identify UTI in urine samples, classify causative bacteria, and determine antibiotic sensitivity, offering significant potential for improving UTI diagnosis and treatment.
IEEE SENSORS JOURNAL
(2022)
Article
Biochemistry & Molecular Biology
Yuansen Tang, Naoki Haruta, Akiyoshi Kuzume, Kimihisa Yamamoto
Summary: The study demonstrates the development of an ultrasensitive, laboratory-scale vibrational spectroscopic technique for characterising subnano-particles and single-atom catalysts. The technique expands the accessibility of small targets on substrates by fine design of nano-spatial local enhancement fields, achieving the detection of isolated small targets and revealing the effects of intermolecular/interatomic interactions within the subnano configuration under actual experimental conditions.
Article
Chemistry, Physical
Jaspal Singh, Subhavna Juneja, R. K. Soni, Jaydeep Bhattacharya
Summary: Metal free heterojunctions, like the CuO-Cu2O nanorods/TiO2 nanoparticles heterostructures synthesized in this study, show promising potential as low-cost photocatalysts. These heterojunctions have superior sunlight-induced photodegradation activity and can effectively remediate toxic wastewater.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Physical
Jaspal Singh, R. K. Soni
Summary: The synthesis of Au nanoparticles encapsulated TiO2 nanospheres with tunable optical properties has been reported in order to improve light absorption and charge carrier lifetime in photocatalysis. The formation of Au-TiO2 nanohybrids with enhanced photodegradation ability is attributed to the development of a Schottky interface between the two materials and an improved visible light-harvesting ability, which effectively decomposes organic molecules under sunlight.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Physics, Applied
Jaspal Singh, Rishikesh Singh, Parul Duhan, Yamini Mann, Ashis K. Manna, Debosmita Banerjee, R. K. Soni
Summary: This study demonstrates the cost-effective hydrothermal synthesis of MoS2 thin films with tunable morphology on conductive ITO substrates. The thread-like MoS2 structures show the highest efficiency for sunlight-induced photodegradation activity. The morphology-dependent charge separation behavior in MoS2 thin films contributes significantly to their enhanced photodegradation capabilities.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Applied
A. K. Verma, R. K. Soni
Summary: A facile synthesis method of multi-spiked star-shaped silver structures for SERS substrates was reported, demonstrating ultra-sensitive detection of probe molecules at low concentrations. The technology also achieved high specificity detection of multiple analytes in complex mixtures, along with providing excellent signal uniformity and reproducibility.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Jaspal Singh, R. K. Soni
Summary: Visible light-sensitive 2D-layered In2S3-MoS2 nanohybrids were prepared through a facile hydrothermal method, capable of efficiently degrading organic contaminants. The nanohybrids showed significant optical absorption and bandgap narrowing in the visible region, facilitating charge transfer and improving synergistic effects, leading to enhanced photocatalytic activity.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Jaspal Singh, Prachi Sharma, Nishant Tripathi, Daria Shishkina, Anastasiia Rymzhina, Elisey A. Boltov, Vladimir Platonov, Vladimir Pavelyev, Valentyn S. Volkov, Aleksey Arsenin, Rishikesh Singh, R. K. Soni, Mohammad Talib, Samrah Manzoor, Debosmita Banerjee, P. M. Z. Hasan, Ahmed Alshahrie, Reem Darwesh, Maria A. Anikina, Prabhash Mishra
Summary: Two-dimensional TiS3 nanostructures have been successfully employed for the removal of toxic-industrial pollutants in water bodies. The nanostructures, produced using the CVT technique, exhibit exceptional photocatalytic properties for potential environmental applications. Under IR irradiation, the TiS3 nanoribbons demonstrate high disintegration percentage, effectively decomposing methyl-orange and methyl-blue solutions.
CATALYSIS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jaspal Singh, R. K. Soni
Summary: The study demonstrates the superior performance of Ag nanoparticles functionalized ZnO-CuO nanohybrids in photocatalysis and SERS sensing, including enhancements in optical absorption and fluorescence, as well as the ability to degrade organic pollutants under sunlight exposure and efficiently detect rhodamine 6g molecules.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Spectroscopy
Ashwani Kumar Verma, Ravi Kant Soni
Summary: Multibranched silver nanostructures have been synthesized and studied for their high sensitivity in SERS detection, particularly in detecting explosive molecules.
JOURNAL OF RAMAN SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Govind Kumar, Ravi Kant Soni
Summary: This study presents a simple route to design highly sensitive SERS substrates based on triangular silver nanoplates, achieved by controlling the reaction kinetics and seed volume in a modified seed-mediated approach to tune the localized surface plasmon resonance. The research reveals that the size, shape, and dipolar plasmon resonance wavelength of the silver nanoplates are the principal contributing factors for designing high-performance SERS substrates.
Article
Chemistry, Physical
Jaspal Singh, R. K. Soni, Jeongyong Kim
Summary: Surfactant-free In(2)S(3) nanoflowers were prepared by the thermal assembly of two-dimensional In2S3 nanosheets, leading to a substantial enhancement of optical absorption and tunable bandgap narrowing, thus improving the photocatalytic performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Spectroscopy
Govind Kumar, Ravi Kant Soni
Summary: We report the successful detection of trace-level molecules using deep-UV surface-enhanced Raman spectroscopy (SERS) on shape-anisotropic rhodium (Rh) nanoparticles. Rh concave nanocubes exhibited the highest SERS activity, with great detection sensitivity. The deep-UV SERS technology based on Rh nanoparticles holds tremendous potential for the identification of hazardous materials.
JOURNAL OF RAMAN SPECTROSCOPY
(2022)
Article
Materials Science, Multidisciplinary
Ashwani Kumar Verma, R. K. Soni
Summary: In this study, hybrid Sn-Au SERS substrates composed of AuNPs deposited on textured Sn substrates were fabricated and used for ultra-trace analyte detection. The substrates exhibited hierarchically arranged sharp micro-pyramids with densely decorated micro/nano-surface features, resulting in high SERS performance. The synthesized substrates showed versatility in detecting a wide range of analytes with highly reproducible SERS signals and low limit-of-detection concentrations.
Article
Optics
A. K. Verma, R. K. Soni
Summary: We report a facile synthesis strategy of bimetallic ultra-thin shell-wrapped gold-palladium (Au-Pd) core@shell nanoparticles (NPs) employing the liquid-assisted pulsed laser ablation (LA-PLA) technique. The bimetallic nanoparticles were prepared by double-step successive and single-step simultaneous laser ablation in the presence of precursor solutions. The columbic attraction of the metal ions in the solution with the ablated metal nanoparticles ensures the uniform wrapping of ultra-thin shell layer through the electrostatic self-assembly.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Physical
A. K. Verma, R. K. Soni
Summary: This study presents the identification of ultra-trace analyte concentrations using laser-textured palladium-gold hierarchical superhydrophobic micro-arrays as surface-enhanced Raman sensors. The optimized fabrication parameters result in hybrid SMA-SERS sensors with excellent superhydrophobicity and uniform signal detectability down to -34.2 fM MB molecules. These sensors enable the detection and identification of multiple analytes.
SURFACES AND INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Subhavna Juneja, Jaspal Singh, Roshni Thapa, R. K. Soni, Jaydeep Bhattacharya
Summary: The text discusses the trend of sustainable development driving modern technology, emphasizing the importance of adopting greener fabrication processes in the manufacturing sector. A bi-functional hybrid system was synthesized using a biosynthetic reduction strategy, showing strong surface-enhanced Raman scattering characteristics.
NEW JOURNAL OF CHEMISTRY
(2021)