Article
Engineering, Electrical & Electronic
Santosh Kumar, Zhu Guo, Ragini Singh, Qinglin Wang, Bingyuan Zhang, Shuang Cheng, Feng-Zhen Liu, Carlos Marques, Brajesh Kumar Kaushik, Rajan Jha
Summary: This study introduces a fiber-optic localized surface plasmon resonance (LSPR) based biosensor for sensitive detection of Shigella bacterial species. By controlled etching and coating with nanomaterials, the sensor achieves increased refractive index sensitivity and excitation of localized plasmons. Results show successful and efficient detection of Shigella with high sensitivity, making it potentially valuable in the future as an alternative to existing commercial methods.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Angeline S. Dileseigres, Yoann Prado, Olivier Pluchery
Summary: The functionalization of gold nanoparticles with thiol molecules in solution is crucial for their application development. In this study, the changes in localized surface plasmon resonance (LSPR) peak due to the reaction between thiol molecules and gold nanoparticles were investigated using UV-visible spectroscopy. The saturation of thiol molecules on the nanoparticle surface was confirmed, and the wavelength shift was accurately predicted using an analytical model. The kinetics of the functionalization reaction were found to be rapid, completing in less than an hour.
Article
Chemistry, Multidisciplinary
Jia Zhang, Xizhe Cheng, Han Zhang, Jiapeng Zheng, Jianfang Wang
Summary: Plasmonic nanostructures can control the photoluminescence emission properties and enhance the performance of optical systems. This study focuses on the selective enhancement of different emission lines of lanthanide ions using plasmon-enabled tuning. The integration of plasmonic and luminescent units in spherical nanostructures allows for the systematic modulation of selective emission enhancement. The results have potential applications in anti-counterfeiting and optical temperature measurements.
Article
Chemistry, Multidisciplinary
Pengcheng Gao, Yingying Wei, Qianrui Xu, Yong Jiang
Summary: This study explores a green method to prepare chain-like gold nanoparticle assembly structures using L-cysteine. The L-cysteine acts as a morphology inducer and a template molecule to control the morphology of the nanoparticles and trigger the assembly. The obtained assembly structures exhibit significant absorption in the near-infrared (NIR) region and can be used for photothermal cancer therapy. Coating the assembly with biocompatible mesoporous silica improves biocompatibility and drug delivery ability.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Nanoscience & Nanotechnology
Ming Lin, Mengdi Lu, Yuzhang Liang, Li Yu, Wei Peng
Summary: Localized surface plasmon resonance (LSPR) and lossy mode resonance (LMR) are simultaneously excited by gold nanoparticle (AuNP) arrays and top-coated polyelectrolyte layer on optical fibers, enhancing the sensitivity of the optical sensor. Thicker polyelectrolyte layer leads to higher refractive index sensitivity, and the optimized sensor with 50 nm AuNPs and 20 PAH/PSS bilayers shows improved stability and sensitivity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Nur Afifah Ahmad Nazri, Nur Hidayah Azeman, Mohd Hafiz Abu Bakar, Nadhratun Naiim Mobarak, Tg Hasnan Tg Abd Aziz, Ahmad Rifqi Md Zain, Norhana Arsad, Yunhan Luo, Ahmad Ashrif A. Bakar
Summary: An optical sensor-based localized surface plasmon resonance (LSPR) sensor was demonstrated for sensitive and selective chlorophyll detection through the integration of amino-functionalized carbon quantum dots (NCQD) and triangle silver nanoparticles (AgNPs). The sensor showed high sensitivity and detection limits, with no interference from other ionic species.
Article
Chemistry, Analytical
Srivatsa Aithal, Sarah Mishriki, Rohit Gupta, Rakesh P. Sahu, George Botos, Shazia Tanvir, Russell W. Hanson, Ishwar K. Puri
Summary: The study introduces a rapid detection test for SARS-CoV-2 utilizing nanoprobes functionalized with specific aptamer to identify spike membrane protein. The nanoprobes successfully detect spike protein concentrations of 16 nM and higher.
Article
Nanoscience & Nanotechnology
Asta Kausaite-Minkstimiene, Anton Popov, Almira Ramanaviciene
Summary: A surface plasmon resonance (SPR) immunosensor signal amplification strategy based on antibody-functionalized gold-coated magnetic nanoparticles (mAuNPs) was developed for ultrasensitive and quantitative detection of the CD5 biomarker. The sandwich immunoassay utilizing mAuNPs-anti-CD5(2B) significantly improved the detection sensitivity and showed satisfactory performance in human blood serum.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Analytical
Vivek Semwal, Oliver Rishoj Jensen, Ole Bang, Jakob Janting
Summary: This paper presents numerical and experimental results on the effects of spherical gold nanoparticles (AuNPs) size on Localized Surface Plasmon Resonance (LSPR) refractive index (RI) sensitivity, Figure of Merit (FoM), and penetration depth (dp). The study also investigates the influence of AuNP dimer interparticle distance (ds) on these parameters. The results show that a diameter of 60 nm AuNPs provides the best FoM. Furthermore, the interparticle distance between d = 20 nm and 60 nm AuNPs significantly affects the RI sensitivity. The importance of penetration depth information for biosensing using aptamers is discussed in relation to aptamer size.
Article
Chemistry, Analytical
Yuanyang Xie, Yu Huang, Jiye Li, Jiangling Wu
Summary: A pH-triggered colorimetric assay using aptamer anchored gold nanoparticles has been developed to detect E. coli O157:H7. The movement of HS-Apt@AuNPs in different solvents triggers different responses due to the pH effect and aptamer's capturing ability, leading to changes in colorimetric signals. This pH-dependent trigger method provides flexibility in design for gold nanoparticle-based biosensing assays, showing great potential for highly sensitive bacterial sensors in public health defense.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
Yumei Zhang, Liyun Ding, Jue Zhao, Xingdong Jiang, Fei Ma
Summary: Acetylcholine is an important neurotransmitter that can be detected using a simple electrostatic interaction to create an optical fiber biosensor. The biosensor has high sensitivity and a linear range, making it more convenient, simple, and cost-effective compared to traditional detection methods.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Gyeong-Su Park, Kyung Suk Min, Hyuksang Kwon, Sangwoon Yoon, Sangwon Park, Ji-Hwan Kwon, Sangmin Lee, Jaeyeon Jo, Miyoung Kim, Seong Keun Kim
Summary: Research using high spatial- and spectral-resolution mapping of LSPR modes and nanoscale strain mapping investigates the distribution of LSPR modes and the effect of defect-induced strains on properties.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Analytical
Ariany Soares Coco, Fabiana Vasconcelos Campos, Camilo Arturo Rodriguez Diaz, Marco Cesar Cunegundes Guimaraes, Adilson Ribeiro Prado, Jairo Pinto de Oliveira
Summary: In this study, a biosensor utilizing the localized surface plasmon resonance (LSPR) of gold nanoparticles (AuNPs) was developed to detect glyphosate in food samples. AuNPs were synthesized, functionalized with either cysteamine or anti-glyphosate antibody, and characterized using various techniques. Both conjugates successfully detected the presence of glyphosate, with the antibody functionalized AuNPs exhibiting broader detection range and better performance. This study demonstrates the potential of AuNP-based biosensors for glyphosate detection in food samples.
Article
Chemistry, Analytical
Mengdi Lu, Hu Zhu, Ming Lin, Fang Wang, Long Hong, Jean-Francois Masson, Wei Peng
Summary: This study successfully used block copolymer brush-like layers on optical fibers to achieve dense and well-dispersed gold nanorods films, enabling the development of real-time biosensors for antigen-antibody interaction. By preparing citrate-stabilized gold nanorods via surfactant exchange, issues related to cytotoxicity and sensor performance were addressed. The sensor produced using the PS-b-P4VP template demonstrated higher sensitivity and detection limit, showcasing the potential application of these biosensors without cytotoxicity.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Prachi R. Yadav, Mehedi H. Rizvi, Bjoern Kuttich, Sumeet R. Mishra, Brian S. Chapman, Brian B. Lynch, Tobias Kraus, Amy L. Oldenburg, Joseph B. Tracy
Summary: The organization of plasmonic nanoparticles in shape-memory polymer films was studied for their coupling strength and polarization dependence. Significant polarization-dependent response was observed during stretching, which disappeared after shape recovery. The study also demonstrated the potential application of these materials as optical thermal history sensors.
ACS APPLIED NANO MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Gayatri K. Joshi, Samantha Deitz-McElyea, Thakshila Liyanage, Katie Lawrence, Sonali Mali, Rajesh Sardar, Murray Korc
Article
Chemistry, Physical
Gayatri K. Joshi, Sarah L. White, Merrell A. Johnson, Rajesh Sardar, Prashant K. Jain
JOURNAL OF PHYSICAL CHEMISTRY C
(2016)
Article
Chemistry, Physical
Gayatri K. Joshi, Phillip J. McClory, Sukanta Dolai, Rajesh Sardar
JOURNAL OF MATERIALS CHEMISTRY
(2012)
Article
Chemistry, Physical
Gayatri K. Joshi, Phillip J. McClory, Barry B. Muhoberac, Amar Kumbhar, Kimberly A. Smith, Rajesh Sardar
JOURNAL OF PHYSICAL CHEMISTRY C
(2012)
Article
Chemistry, Multidisciplinary
Gayatri K. Joshi, Samantha Deitz-McElyea, Merrell Johnson, Sonali Mali, Murray Korc, Rajesh Sardar
Article
Chemistry, Multidisciplinary
Gayatri K. Joshi, Karl N. Blodgett, Barry B. Muhoberac, Merrell A. Johnson, Kimberly A. Smith, Rajesh Sardar
Article
Chemistry, Multidisciplinary
Gayatri K. Joshi, Merrell A. Johnson, Rajesh Sardar
Article
Chemistry, Physical
Ab Qayoom Mir, Gayatri Joshi, Piue Ghosh, Shikha Khandelwal, Ashish Kar, Ravi Hegde, Saumyakanti Khatua, Arnab Dutta
ACS ENERGY LETTERS
(2019)
Article
Chemistry, Multidisciplinary
Ashish Kar, Varsha Thambi, Diptiranjan Paital, Gayatri Joshi, Saumyakanti Khatua
Review
Chemistry, Physical
Gayatri Joshi, Ab Qayoom Mir, Arkaprava Layek, Afsar Ali, Tarik Aziz, Saumyakanti Khatua, Arnab Dutta
Summary: Gold- and silver-based plasmonic materials have become game changers in the field of solar-driven small-molecule activation due to their enhanced and tunable absorption cross sections. This review discusses the cutting-edge research in plasmon-mediated small-molecule activation, focusing on the role of plasmonic nanostructures as photosensitizers and the development of various photocatalytic materials. The challenges and future directions in this emerging research field are also discussed.
Article
Nanoscience & Nanotechnology
Gayatri Joshi, Avishek Saha, Arnab Dutta, Saumyakanti Khatua
Summary: Near-infrared (NIR) photon-driven H2 production from water is considered an efficient method for sustainable hydrogen-based energy economy. Researchers have developed a gold nanoprism-based photocatalytic assembly capped with an amine and a silane ligand pair, achieving high H2 production rate and photon-to-hydrogen conversion efficiency. The amine ligand scavenges the hot hole while the silane aids the H2 production via hydrolysis on the plasmon surface. This photocatalytic assembly can serve as a template for large-scale NIR-driven H2 production unit.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Naveen Kumar, Akanksha Sharma, Archit Bahirat, Gayatri Joshi, Saumyakanti Khatua
Summary: In this study, a novel strategy for near-infrared (NIR) photon-to-hydrogen conversion was developed, which does not require external electric bias or sacrificial chemicals. The strategy utilized a plasmonic substrate containing gold nanoprisms to drive the photocatalytic Si-H activation in water, producing hydrogen and silanol. The photocatalytic substrate exhibited excellent photon-to-hydrogen conversion efficiency of 0.85-1.45% for wavelengths between 1000 and 1700 nm, and hydrogen production rate of 132 μL min(-1) mg(-1) Au. The simplicity, scalability, and high photon-to-hydrogen production efficiency of our strategy make it highly relevant for applications in the alternative energy sector.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Gayatri Joshi, Rajesh Kashyap, Kalyani Patrikar, Anirban Mondal, Saumyakanti Khatua
Summary: This study demonstrates that utilizing covalently bound surface-coating ligands with suitable orbital alignment can provide electron transport channels, boosting hot electron extraction from gold nanostructures and significantly enhancing the rate of hydrogen evolution reaction under near-infrared excitation.
Article
Chemistry, Multidisciplinary
Gayatri Joshi, Rajesh Kashyap, Kalyani Patrikar, Anirban Mondal, Saumyakanti Khatua
Summary: Photoexcitation of noble metal nanoparticles generates surface plasmons that can initiate and accelerate chemical reactions. However, the efficiency is limited by the recombination of charge carriers. Designing nanostructures that promote charge separation and transport is crucial for efficient utilization of these carriers. We demonstrate that covalently bound surface-coating ligands can enhance the extraction of hot electrons from a gold nanostructure, leading to a significant increase in the rate of photocatalytic hydrogen evolution reaction.