Article
Biochemistry & Molecular Biology
Saltanat B. Ikramova, Zhandos N. Utegulov, Kadyrjan K. Dikhanbayev, Abduzhappar E. Gaipov, Renata R. Nemkayeva, Valery G. Yakunin, Vladimir P. Savinov, Victor Yu Timoshenko
Summary: This study explored the use of silicon nanowires (SiNWs) combined with gold nanoparticles (Au NPs) for surface-enhanced Raman scattering (SERS) of probe molecules. The research found that the filling factor of SiNW arrays controlled the SERS efficiency, with the highest enhancement observed for samples with a porosity of 55%. The results demonstrate the electromagnetic enhancement of SERS through localized surface plasmon resonances in Au-NPs on SiNW surfaces, accompanied by light scattering in the SiNW arrays.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Chemistry, Multidisciplinary
Syed M. N. Hasan, Weicheng You, Arnob Ghosh, Sharif Md. Sadaf, Shamsul Arafin
Summary: This work presents the selective area epitaxy of GaN nanostructures grown on Ga-polar GaN/sapphire substrates by plasma-assisted molecular beam epitaxy. Three types of nanostructures, namely nanowires, nanofins, and nanorings, are demonstrated on GaN-on-sapphire templates, with investigation on the control of their morphology and orientation. This study advances the understanding of selective area epitaxy for defining complex III-nitride nanostructures, which are important in the fields of nanotechnology and nanoscience.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Optics
Giulia Crotti, Andrea Schirato, Remo Proietti Zaccaria, Giuseppe Della Valle
Summary: By investigating the limits of the quasi-static theory (QST) validity range for gold nanostructures freestanding in air, comparing the errors between QST predictions and exact results, a non-trivial relationship between the accuracy of QST and the size of the scatterer is revealed, showing a strong dependence on the excitation conditions for QST accuracy.
Article
Nanoscience & Nanotechnology
Theresa Bartschmid, Amin Farhadi, Maurizio E. Musso, Eric Sidney Aaron Goerlitzer, Nicolas Vogel, Gilles R. Bourret
Summary: Gold nanoparticle/silicon composites are important substrates for sensing applications due to their geometry-dependent physicochemical properties and high sensing activity via surface-enhanced Raman spectroscopy (SERS). In this study, the critical parameters that influence nanoparticle coverage, aggregation, and assembly sites were controlled to prepare substrates with homogeneous optical properties and SERS activity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Fan Liao, Xing Fan, Huixian Shi, Qing Li, Mengjie Ma, Wenxiang Zhu, Haiping Lin, Youyong Li, Mingwang Shao
Summary: Carbon dioxide electrochemical reduction (CO2RR) is an effective method to reduce CO2 emissions and mitigate global warming and its environmental impact. This study reports that Au nanoparticles can be dispersed and anchored on silicon nanowires to form Au-Si binary nanomaterials, which can enhance CO selectivity and stably drive CO2RR at low overpotential.
CHINESE CHEMICAL LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Renchao Jin, Yihao Xu, Zheng-Gao Dong, Yongmin Liu
Summary: A novel approach to generating optical pulling forces on a gold nanowire using hyperbolic metamaterials is proposed in this study. The optical pulling force is induced by concave isofrequency contour and directional surface plasmon polaritons, showing broadband characteristics and insensitivity to the angle of incidence.
Article
Nanoscience & Nanotechnology
Dirk Jonker, Ketki Srivastava, Marta Lafuente, Arturo Susarrey-Arce, Ward van der Stam, Albert van den Berg, Mathieu Odijk, Han J. G. E. Gardeniers
Summary: In this study, gold nanoparticles with a diameter of 67 +/- 6 nm supported by vertically aligned shell-insulated silicon nanocones were formed for ultralow variance SERS. The morphology and optical properties of the substrates were assessed through various characterization techniques. The SERS activity was measured and compared to other lithographically derived assemblies. The low variance of our substrates makes them suitable for many potential SERS applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lukas F. Engel, Lola Gonzalez-Garcia, Tobias Kraus
Summary: In this study, we used direct nanoimprint lithography to self-assemble nanoscale colloids and create flexible transparent electrodes with metal line widths below 3 μm. We found that the line width had a significant impact on the optical transmittance, and plasma sintering only partially removed the insulating ligands, resulting in conductive shells and non-conductive cores. Furthermore, we demonstrated that the self-assembly of high-aspect nanowires could compensate for defects and irregularities during imprinting, leading to improved electrode performance.
NANOSCALE ADVANCES
(2022)
Article
Chemistry, Physical
Joanna Czechowska, Ewelina Cichon, Anna Belcarz, Anna Slosarczyk, Aneta Zima
Summary: This study developed bioactive bone substitutes with antibacterial properties, incorporating gold nanoparticles and silicon-modified tricalcium phosphate. The biomicroconcretes showed good mechanical performance and antimicrobial activity, making them suitable for medical applications.
Article
Chemistry, Inorganic & Nuclear
Dipanjan Samanta, Manisha Shaw, Md Abdus Salam Shaik, Rajarshi Basu, Imran Mondal, Angana Bhattacharya, Amita Pathak
Summary: Optical asymmetry and structural complexity were observed in flower-shaped CuO nanostructures and their toroid-like forms. The origin of chirality in these structures was attributed to the helical arrangement of the Cu-O-Cu network. The interaction between the toroid-shaped CuO nanostructures and enantiomeric tryptophan moieties was investigated.
INORGANIC CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Petr A. Sokolov, Ruslan R. Ramazanov, Valeriy Rolich, Maria A. Popova, Vyacheslav E. Shalygin, Nina A. Kasyanenko
Summary: Nanostructures synthesized using DNA-conjugated gold nanoparticles have various applications in biosensorics. The stability of the DNA duplex and maintaining high ionic strength of the buffer solution are crucial factors in determining the final geometry of these nanostructures. By utilizing DNA-bridged seeds with tris(hydroxymethyl)aminomethane as a soft reducing agent, dumbbell-like gold nanoparticles were successfully synthesized with high concentrations of sodium and magnesium ions.
Article
Chemistry, Multidisciplinary
Fadime Mert Balci, Sema Sarisozen, Nahit Polat, C. Meric Guvenc, Ugur Karadeniz, Ayhan Tertemiz, Sinan Balci
Summary: Advances in colloid chemistry and nanofabrication have enabled the synthesis of noble monometallic and bimetallic nanocrystals with tunable optical properties, including the formation of plasmon-exciton hybrid states called plexxitons. To expand the application scope, the development of new plexxitonic nanocrystals with outstanding optical and chemical properties remains a key goal and challenge. The manipulation of nanoparticle shapes and material combinations plays a crucial role in achieving this goal.
NANOSCALE ADVANCES
(2021)
Article
Multidisciplinary Sciences
Guo-Qiang Liu, Yuan Yang, Yi Li, Taotao Zhuang, Xu-Feng Li, Joshua Wicks, Jie Tian, Min-Rui Gao, Jin-Lan Peng, Huan-Xin Ju, Liang Wu, Yun-Xiang Pan, Lu-An Shi, Haiming Zhu, Junfa Zhu, Shu-Hong Yu, Edward H. Sargent
Summary: Solar conversion efficiencies of photoelectrochemical catalysis are hindered by the light harvesting range. Near-infrared-active photoanodes featuring lattice-matched morphological hetero-nanostructures can efficiently improve the efficiency of photoelectrochemical hydrogen production.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
Rais Ahmad Dar, Mohd Zubair Ansari
Summary: In this study, various ZnO nanostructures were synthesized using sol-gel technique with different solution pH values. The pH values were adjusted by adding NaOH solution dropwise, leading to different morphologies of ZnO nanostructures. The morphological structures were investigated using scanning electron microscope, and the structural and chemical analysis as well as optical characterizations were carried out using X-ray diffraction, FTIR, Raman and UV-vis spectroscopic techniques. The results showed that the ZnO nanostructures exhibited different shapes and crystallinity as the pH values varied. The optical properties of the ZnO nanocrystals were also found to be desirable. Raman and FTIR spectroscopy were used to further analyze the elemental and compositional characteristics.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Chemistry, Multidisciplinary
Kirill Khabarov, Emiliia Filalova, Messan Nouraldeen, Ekaterina Kameneva, Andrey Musaev, Sergei Tikhonov, Victor Ivanov
Summary: In this study, the influence of agglomeration degree of nanoparticles on the signal enhancement of surface-enhanced Raman spectroscopy (SERS) was investigated. It was found that structures formed mainly from non-agglomerated nanoparticles can enhance the SERS signal better. Aerosol nanoparticles modified by pulsed laser radiation show better results compared to thermally modified nanoparticles.
Article
Chemistry, Physical
Yuan Li, Wenwu Shi, Nitin Chopra
Article
Materials Science, Multidisciplinary
Wenwu Shi, Brian Pinto
Article
Nanoscience & Nanotechnology
Wenwu Shi, Nitin Chopra
ACS APPLIED MATERIALS & INTERFACES
(2012)
Article
Chemistry, Physical
Nitin Chopra, Wenwu Shi, Anshuman Bansal
Article
Chemistry, Physical
Junchi Wu, Wenwu Shi, Nitin Chopra
Article
Chemistry, Multidisciplinary
Wenwu Shi, Nitin Chopra
JOURNAL OF NANOPARTICLE RESEARCH
(2011)
Article
Chemistry, Physical
Junchi Wu, Wenwu Shi, Nitin Chopra
JOURNAL OF PHYSICAL CHEMISTRY C
(2012)
Article
Materials Science, Multidisciplinary
Nitin Chopra, Hylton G. McWhinney, Wenwu Shi
MATERIALS CHARACTERIZATION
(2011)
Article
Materials Science, Multidisciplinary
Nitin Chopra, Wenwu Shi, Andrew Lattner
MATERIALS CHARACTERIZATION
(2014)
Article
Materials Science, Multidisciplinary
Nitin Chopra, Junchi Wu, Wenwu Shi
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2013)
Article
Materials Science, Multidisciplinary
W. Shi, K. Crews, N. Chopra
MATERIALS TECHNOLOGY
(2010)