Article
Physics, Applied
Kai Yang, Shenghui Kang, Xiaoyu Wu, Bohua Liu, Chongling Sun, Yanyan Wang
Summary: A high NIR sensitivity and spectral selectivity photothermal detector was developed by modifying a photothermal layer of reduced graphene oxide-Au nanorods hybrid. The detector converts light energy into heat and measures resistance changes. The hybrid material exhibits remarkable photothermal conversion efficiency and dependence on spectral response, resulting in high sensitivity to illumination in the wavelength range from 700 to 1000 nm.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Xi Yang, Dong Su, Xie Yu, Pei Zeng, Huageng Liang, Guangzu Zhang, Boxiang Song, Shenglin Jiang
Summary: The controllable nanogap structures enable strong and adjustable localized surface plasmon resonance (LSPR). A novel hierarchical plasmonic nanostructure (HPN) is created using colloidal lithography with a rotating coordinate system. The HPN increases the density of hot spots and enhances LSPR tunability and field enhancement. The hot spot engineering strategy of HPNs is demonstrated in surface-enhanced Raman spectroscopy (SERS) applications and allows single-molecule level detection and long-range mapping, providing a platform and guidance for various LSPR applications.
Article
Chemistry, Multidisciplinary
Ke Zhao, Philip Kohnke, Ziguang Yang, Xinpeng Cheng, Shu-Li You, Liming Zhang
Summary: A gold(I)-catalyzed enantioselective dearomatization is achieved through metal-chiral ligand cooperation. A new and divergent synthesis of chiral bifunctional binaphthyl-2-ylphosphines is developed for rapid access to these ligands, enabling broad substrate scope. The selective acceleration of one enantiomer formation is achieved through hydrogen bonding between substrate and ligand remote basic group, leading to enantiomeric excesses up to 98%.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Chemical
Degui Li, Tong Liu, Yujia Luo, Xiangqun Zhuge, Kun Luo, Zhihong Luo, Xiaoteng Liu, Kui Zhang
Summary: We demonstrate a simple route to recycle gold nanoparticle (Au NP) catalysts by altering surface wettability. The hydrophilic Au NPs were used to catalyze the reduction of 4-nitrophenol (4-NP) and then separated from the suspension by interfacial ligand exchange. The catalyst was regenerated through reversible ligand exchange.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Bin Lu, Karol Vegso, Simon Micky, Christian Ritz, Michal Bodik, Yuriy Myronovych Fedoryshyn, Peter Siffalovic, Andreas Stemmer
Summary: In this work, a method for fabricating large-area gold nanoparticle superlattices with subnanometer interparticle gaps is demonstrated. The electrical transport measurements reveal significant variations in the nanogap conductance, while in situ optical reflectance measurements show enhanced plasmonic capacitive coupling with decreasing interparticle gap distance. The resulting superlattices also exhibit tunable effective refractive index and extreme field confinement in the high-density subnanometer plasmonic gaps.
Article
Chemistry, Multidisciplinary
Yongliang Zhang, Ke Zhao, Xinyi Li, Carlos D. Quintanilla, Liming Zhang
Summary: By using a chiral bifunctional phosphine ligand, a highly efficient and enantioselective dearomatization of phenols is achieved through metal-ligand cooperation. The reaction shows great generality by allowing substitutions at various positions of benzene, including electron-withdrawing groups and carbon-based groups. Spirocyclohexadienone-pyrrol-2-ones, spirocyclohexadienone-butenolides, and spirocyclohexadenone-cyclopentenones are formed in high yields and with high enantioselectivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Biochemistry & Molecular Biology
Akira Shinohara, Hideyuki Shinmori
Summary: Here, we present a switching method for singlet oxygen (O-1(2)) generation by adsorption/desorption of porphyrins to gold nanoparticles driven by sulfide compounds. The generation of O-1(2) by photosensitization is effectively suppressed by the gold nanoparticles and can be restored through a sulfide ligand exchange reaction. The on/off ratio of O-1(2) quantum yield (phi(Delta)) reached 7.4. By examining various incoming sulfide compounds, it was found that the ligand exchange reaction on the gold nanoparticle surface could be thermodynamically or kinetically controlled. The remaining gold nanoparticles in the system still suppress the generation of O-1(2), which can be precipitated out simultaneously with porphyrin desorption by the proper polarity choice of the incoming sulfide to restore the O-1(2) generation.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Electrochemistry
Sudip Saha, Jie Yang, S. Shayan Mousavi Masouleh, G. A. Botton, Leyla Soleymani
Summary: Optically-excited gold nanoparticles generate hot charge carriers that improve the energy conversion efficiency of photochemical and photoelectrochemical reactions. In this study, interband excitation showed higher photocurrent generation efficiency than intraband excitation. The surface distribution of gold nanoparticles was found to strongly affect the efficiency of photocurrent generation.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Shohei Yamashita, Tatsuya Sudo, Hidehiro Kamiya, Yohei Okada
Summary: Phosphonate ligands tightly bind to TiO2 nanoparticle surfaces and can be effectively exchanged by other phosphonic acids. The key to successful measurements lies in the design and synthesis of a novel phosphonic acid ligand.
Article
Chemistry, Multidisciplinary
Qiang Zhao, Hajir Hilal, Jeongwon Kim, Woongkyu Park, MohammadNavid Haddadnezhad, Jaewon Lee, Woocheol Park, Joong-Wook Lee, Soohyun Lee, Insub Jung, Sungho Park
Summary: We report a synthetic pathway for the preparation of metal nanoframes with dual-rim structures, and demonstrate their application in single-particle surface-enhanced Raman spectroscopy (SERS) technique. By optimizing the structure and assembly, highly ordered and uniform superlattices can be constructed, which exhibit a detection limit at attomolar concentrations.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Optics
Koji Sugano, Katsunari Maruoka, Kohei Ikegami, Akio Uesugi, Yoshitada Isono
Summary: In this study, various nanostructures capable of generating multiple hotspots in a laser spot were fabricated through a random aggregation process using nanoparticles, allowing for the detection of multiple molecules. A single gold nanoparticle dimer with a single hotspot was successfully fabricated on a silicon substrate using a nanotrench-guided self-assembly technique. The Raman peaks of a single DNA oligomer composed of adenine, guanine, cytosine, phosphate, and deoxyribose were dynamically observed.
Article
Chemistry, Multidisciplinary
Alexandre Genoux, Michal Biedrzycki, Estibaliz Merino, Eva Rivera-Chao, Anthony Linden, Cristina Nevado
Summary: A new family of cationic, bidentate gold(III) fluoride complexes have been prepared and characterized, showing reactivity with cyano and acetylene nucleophiles. The resulting arylgold(III)C(sp) complexes exhibit higher rates of C(sp(2))-C(sp) bond formation compared to phosphine-based monodentate systems.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
Xiaojun Song, Yueliang Wang, Yan Hao, Qingqing Zhu, Yanjuan Li, Lei Song, Zhaoxiang Deng
Summary: This study successfully built a series of homo/heterodimeric plasmonic nanomolecules with prescribed compositions using DNA-guided, solvo-driven Ag ion soldering method. Strong in-solution electric-dipole coupling was achieved for materials with strong (Au, Ag) or damped (Pt, Pd) plasmonic responses.
Article
Physics, Multidisciplinary
Xinghai Zhang, Matthew S. Foster
Summary: This study explores quantum quenches of helical liquids with spin-flip inelastic scattering, revealing two types of strongly nonlinear wave dynamics caused by localized hot spots formed due to scattering. The experimental results suggest potential for verification through the detection of frequency doubling from emitted terahertz radiation.
PHYSICAL REVIEW LETTERS
(2021)
Article
Biophysics
Chunni Wang, Guopeng Xu, Weijie Wang, Zhiyuan Ren, Chengmei Zhang, Yuan Gong, Mingwen Zhao, Yuanyuan Qu, Weifeng Li, Huiting Zhou, Yong-Qiang Li
Summary: Surface-enhanced Raman spectroscopy (SERS) sandwich biosensors show great potential in early diagnosis of bacterial infections. In this study, a bioinspired synergistic plasmonic hotspot (HS) engineering strategy was proposed to construct an ultrasensitive SERS sandwich bacterial sensor (USSB). By coupling a bioinspired signal module and a plasmonic enrichment module, the USSB sensor exhibited ultrahigh detection sensitivity and selectivity towards Staphylococcus aureus in both model and real blood samples.
BIOSENSORS & BIOELECTRONICS
(2023)
Review
Environmental Sciences
Asifur Rahman, Wei Wang, Divyapriya Govindaraj, Seju Kang, Peter J. Vikesland
Summary: Cellulose nanomaterials are advantageous due to their low cost, biocompatibility, and high stability and specific surface area. They can be combined with metal nanoparticles, organic polymers, and metal-organic frameworks to produce nanocomposites with various applications in environmental science and engineering.
CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY
(2023)
Correction
Green & Sustainable Science & Technology
Shantanu V. Bhide, Stanley B. Grant, Emily A. Parker, Megan A. Rippy, Adil N. Godrej, Sujay Kaushal, Greg Prelewicz, Niffy Saji, Shannon Curtis, Peter Vikesland, Ayella Maile-Moskowitz, Marc Edwards, Kathryn G. Lopez, Thomas A. Birkland, Todd Schenk
NATURE SUSTAINABILITY
(2023)
Article
Nanoscience & Nanotechnology
Xin Wang, Seokgyun Ham, Wei Zhou, Rui Qiao
Summary: In this study, molecular dynamics simulations were used to investigate the adsorption of rhodamine 6G and choline molecules on gold electrodes with different surface charges. The results show that both molecules can adsorb on gold surfaces at all surface charge densities, but the adsorption mechanisms and configurations may vary.
Review
Engineering, Environmental
Seo Won Cho, Haoran Wei
Summary: This review article summarizes the current status and future opportunities of surface-enhanced Raman spectroscopy (SERS) for the analysis of emerging contaminants (ECs) in drinking water. The working principles of SERS are introduced, and a comparison between SERS and liquid chromatography-tandem mass spectrometry is made. Strategies for designing effective SERS sensors for EC analysis are discussed based on different categories of ECs. The discussions are guided by advancements in SERS technology and drinking water regulatory policies.
FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING
(2023)
Review
Chemistry, Multidisciplinary
Wei Wang, Seju Kang, Wei Zhou, Peter J. Vikesland
Summary: Many emerging infectious diseases are caused by viruses, which can be transmitted through various environmental matrices. The development of nanosensors based on unique properties of nanomaterials offers great potential for rapid and sensitive virus detection in the environment. These nanosensors can generate detectable signals through interactions between viruses and nanomaterials, providing fast response times, high sensitivity, and specificity.
ENVIRONMENTAL SCIENCE-NANO
(2023)
Article
Chemistry, Multidisciplinary
Yuming Zhao, Chuan Xiao, Elieser Mejia, Aditya Garg, Junyeob Song, Amit Agrawal, Wei Zhou
Summary: Metallic nanostructures can enhance luminescence processes and be used for various applications. However, the dependence of nanoplasmonic metal luminescence on voltage modulation has not been thoroughly studied. In this research, we investigate dynamic voltage-modulated nanoplasmonic metal luminescence using nanolaminate nanooptoelectrode arrays. Our experiments show that the luminescence exhibits negative voltage modulation slope in physiological solutions. We also develop a model to understand the relationship between voltage polarization, ionic strength, and luminescence modulation. This work has implications for optical voltage biosensing, signal transduction, and electrochemical monitoring.
Article
Chemistry, Analytical
Wei Wang, Asifur Rahman, Seju Kang, Peter J. Vikesland
Summary: Label-free surface-enhanced Raman spectroscopy (SERS) is a promising technique for bacterial detection. This study evaluated the impact of storage conditions on label-free SERS spectra of Pseudomonas syringae samples stored in phosphate buffered saline. The results showed that storage conditions can significantly affect bacterial SERS signals and should be considered when detecting bacteria or evaluating bacterial response to stress stimuli.
ANALYTICAL CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Kedong Gong, Jianpeng Ao, Kejian Li, Le Liu, Yangyang Liu, Guanjun Xu, Tao Wang, Hanyun Cheng, Zimeng Wang, Xiuhui Zhang, Haoran Wei, Christian George, Abdelwahid Mellouki, Hartmut Herrmann, Lin Wang, Jianmin Chen, Minbiao Ji, Liwu Zhang, Joseph S. Francisco
Summary: This study used stimulated Raman scattering microscopy to visualize the three-dimensional pH distribution inside microdroplets of varying sizes. It found that the surface of all microdroplets is more acidic, and observed a decreasing pH trend from center to edge in small aerosol microdroplets. However, pH distribution differed in larger cloud microdroplets.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Microbiology
Andrea J. J. French, Alexandra K. K. Longest, Jin Pan, Peter J. J. Vikesland, Nisha K. K. Duggal, Linsey C. C. Marr, Seema S. S. Lakdawala
Summary: Efficient spread of respiratory viruses requires the virus to maintain infectivity in the environment. Our study measured the impact of initial droplet volume and relative humidity on the stability of influenza A virus, bacteriophage Phi6, and SARS-CoV-2. Virus decay rates differed between the wet and dry phases, and there were differences in virus decay characteristics by droplet size and virus. This study suggests that virus decay in media is related to droplet evaporation, which is controlled by relative humidity.
Article
Chemistry, Multidisciplinary
Aditya Garg, Wonil Nam, Wei Wang, Peter Vikesland, Wei Zhou
Summary: This study demonstrates the in situ spatiotemporal characterization and multivariate analysis of Pseudomonas syringae biofilms using surface-enhanced Raman spectroscopy (SERS) and nanolaminate plasmonic crystal SERS devices. The results show the potential of this method for monitoring the dynamic evolution of biofilms and their response to viral infection, offering insights for anti-biofilm therapy and viral detection.
Article
Environmental Sciences
Ziyan Wu, Mohan Qin, Haoran Wei
Summary: This study developed a new analytical method that combines fractionated membrane filtration with Raman microspectroscopy to reliably quantify low-micrometer microplastics in lake water. By separating the microplastics into different size fractions, the quality of Raman images of small particles improved substantially.
Article
Engineering, Environmental
Wei Wang, Peter J. Vikesland
Summary: In this study, surface-enhanced Raman spectroscopy (SERS) was used to monitor the bioactive metabolites produced by ampicillin-resistant Pseudomonas aeruginosa strains and investigate the mechanisms underlying antibiotic resistance. The results showed that the blue-green pigment pyocyanin (PYO) dominated the metabolite signals and was significantly enhanced in the presence of subminimal inhibitory concentrations of ampicillin. The SERS spectra also revealed minimal impact on the production of intermediate substances and consistent nutrient consumption. Furthermore, exogenously added PYO enhanced the tolerance of ampicillin-susceptible Escherichia coli to some extent, indicating that PYO mediates antibiotic resistance in both the parent species and cocultured bacterial strains. The metabolic SERS signal provides new insights into antibiotic resistance and has promising applications in environmental monitoring and rapid clinical detection.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Wei Wang, Peter J. Vikesland
Summary: This study incorporates gold nanoparticles into a hydrogel ink for 3D printing and culturing of cells, enabling the use of surface-enhanced Raman spectroscopy (SERS) for cell imaging. A random forest binary classifier is developed to accurately distinguish cell signals from the background. The results show that SERS signals provide information about cellular components.
ANALYTICAL CHEMISTRY
(2023)
Article
Engineering, Environmental
Jian Sun, Yangyun Hu, Xue Cao, Shu-Feng Pang, Pai Liu, Qishen Huang, Yun-Hong Zhang
Summary: This study investigates the impact of water-soluble organic compounds on the efflorescence of ammonium nitrate aerosols. The findings suggest that aerosol viscosity, correlated with molecular diffusion, effectively predicts the variations in efflorescence relative humidity among different aerosols. Organic compounds with higher viscosity hinder efflorescence, while those with lower viscosity have a minor effect. The pH of the droplet also plays a role in promoting or inhibiting efflorescence, depending on the composition of the aerosol.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Environmental
Wei Wang, Peter J. Vikesland
Summary: This study demonstrates the use of surface-enhanced Raman spectroscopy (SERS) to monitor the metabolites produced by ampicillin-resistant Pseudomonas aeruginosa strains and identify the mechanisms underlying antibiotic resistance. The results indicate that the blue-green pigment pyocyanin (PYO) dominates the metabolite signals and is significantly enhanced by exposure to subminimal inhibitory concentrations of ampicillin. These findings provide new insights into antibiotic resistance.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)