Article
Chemistry, Physical
Shuaipeng Chen, Shuaibin Li, Yun Wang, Quan Ren, Yuhua Feng, Hongyu Chen
Summary: We have demonstrated a method to continuously tune the wetting growth of Au on Se seed nanoparticles by manipulating the growth kinetics. This approach allows us to obtain a series of Se-Au hybrids and anisotropic Au semi-shell structures with different sizes, and enables continuous tuning of their absorptions and LSPRs within the Visible-NIR spectral range.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Chemistry, Physical
Tao Zhang, Xuejiao Li, Cuncheng Li, Weiping Cai, Yue Li
Summary: This study presents a one-pot synthesis method for precisely shaped and monodispersed single-crystalline gold nanospheres with an ultrasmooth surface and tunable sizes, achieved through a unique morphology change from octahedral to spherical shape induced by surface self-polishing etching. The localized surface plasmon resonance property of the gold nanospheres with different sizes matches well with theoretical predictions due to their perfect spherical shapes and uniform sizes. This synthesis protocol demonstrates extreme stability in large-scale production of gold nanospheres solution, stored in ethylene glycol for over 24 months, due to isotropic surface tension.
CHEMISTRY OF MATERIALS
(2021)
Article
Multidisciplinary Sciences
Aritra Biswas, Nir Lemcoff, Ofir Shelonchik, Doron Yesodi, Elad Yehezkel, Ella Yonit Finestone, Alexander Upcher, Yossi Weizmann
Summary: The use of plasmonic materials to convert light energy into heat has potential applications in driving chemical reactions at lower temperatures, specifically in the synthesis of nanoparticles.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Yuting Zhuo, Bo Fu, Ruizi Peng, Changbei Ma, Sitao Xie, Liping Qiu
Summary: By combining the molecular recognition specificity of aptamer with high programmability of DNA nanotechnology, we developed an expansion microscopy (ExM) platform for imaging dendritic spines (DS) with enhanced spatial resolution and amplified signal output. Our results demonstrated that the aptamer probe could specifically bind to DS of primary hippocampal neurons. With physical expansion and the introduction of DNA signal amplification strategy, the DS structure could be effectively enlarged by 4-5 folds, leading to the generation of more structural information. This platform enabled evaluation of ischemia-induced early stroke based on the morphological change of DS, highlighting a promising avenue for studying nanoscale structures in biological systems.
Article
Optics
Wencai Bai, Liang Wang, Duo Tang, Fan Yang, Zhiqiang Qiao, Dan Lin, Rong He, Wenkun Zhu, Wenzhi Qin
Summary: Laser initiation technology has broad application prospects in military blasting, but there are obstacles in high-power laser propagation through optical fibers. This study developed gold-copper alloy nanocrystals as an independent laser energy converter material to reduce the initiation threshold and delay time. The results showed that the gold-copper alloy nanocrystals effectively initiated low-sensitive explosives under low-power conditions.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Kirill A. Gonchar, Daniil Moiseev, Ivan Bozhev, Liubov A. Osminkina
Summary: Porous silicon nanowires (PSi NWs) were fabricated using a two step metal-assisted chemical etching method, and it was found that their structural and optical properties depend on the concentration of hydrogen peroxide. The thickness ratio of layers and size of nanocrystals can be tuned by choosing the required concentration of H2O2.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Ryota Kichijo, Naoya Miyajima, Daisuke Ogawa, Hirokazu Sugimori, Ke-Hsuan Wang, Yoshiro Imura, Takeshi Kawai
Summary: Metal nanowires have attracted attention as a promising one-dimensional nanomaterial due to their flexibility and conductivity. This study investigates the effect of different organic solvents on the morphology of metal nanowires and evaluates their surface-enhanced Raman scattering sensitivity.
Article
Chemistry, Multidisciplinary
Sumit Mukherjee, Subhamay Pramanik, Sandip Das, Subhabrata Chakraborty, Shyamal Mondal, Tatan Ghosh, Rajib Nath, Probodh K. Kuiri
Summary: The study synthesized ZnO nanoparticles with different morphologies using varying KOH concentrations as the controlling parameter, resulting in nanoparticles ranging from quasi-spherical to rod shapes. The KOH concentration played a crucial role in influencing the Oriented Attachment (OA) among ZnO nanoparticles.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
Ezgi Yildirim, Raj Kumar Ramamoorthy, Rohan Parmar, Pierre Roblin, Jorge A. Vargas, Valeri Petkov, Ana Diaz, Stefano Checchia, Isaac Rodriguez Ruiz, Sebastien Teychene, Lise -Marie Lacroix, Guillaume Viau
Summary: Currently, there is a strong focus on studying ultrasmall metal nanoparticles due to their unique properties. The synthesis of monodisperse nanoparticles of a very small size and well-defined structure requires a good understanding of the crystallization process, which can be achieved by conducting in situ studies. This article describes the synthesis of ultrasmall gold nanoparticles using reduction methods and reveals the competition between nucleation and crystallization processes. By adjusting reaction conditions, such as concentration and temperature, monodisperse gold nanoparticles with icosahedral structure can be obtained.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Jiamin Gao, Lu Huang, Zhuomin Zhang, Gongke Li
Summary: Specially designed sea urchin-shaped AuNCs were successfully synthesized with tunable plasmonic property, showing excellent SERS enhancement and catalytic degradation performance. The hybridized dsPolyA DNA-directed self-assembly technique played a crucial role in achieving the controllable formation of the anisotropic multi-branched AuNCs. The study also explored the essential conditions influencing the synthesis and precise morphology control of these AuNCs, which exhibited abundant 'hot spots' for SERS detection.
Article
Nanoscience & Nanotechnology
Shu-Ping Lin, Wei-Ju Lee, Man-Cheng Sun, Yu-Hsiu Yang, Lester Uy Vinzons, Yi-Mei Lin, Yu-Ting Wei
Summary: The measurement of neurofilament light chain in human blood plasma/serum allows for rapid and label-free differentiation between healthy individuals and patients at different stages of Alzheimer's disease.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Li Zhou, Xiaoyu Qiu, Zhiheng Lyu, Ming Zhao, Younan Xia
Summary: This study demonstrates the fabrication of Pd-Au asymmetric nanopyramids through seed-mediated growth, showcasing two asymmetric growth modes initiated by symmetry breaking arising from slow reduction kinetics. The manipulation of aspect ratio and tip sharpness of the nanopyramids was achieved by introducing Ag+ ions into the growth solution.
CHEMISTRY OF MATERIALS
(2021)
Article
Biophysics
Wei Ning, Chuyan Zhang, Ziyi Tian, Mengfan Wu, Zewei Luo, Shunming Hu, Hongzhi Pan, Yongxin Li
Summary: In this study, an omega-shaped fiber optic localized surface plasmon resonance (FO-LSPR) biosensor based on hybridization chain reaction (HCR) coupled with gold nanoparticles (AuNPs) was developed for simple and sensitive detection of cfDNA. The biosensor exhibited high sensitivity with a detection limit of 14.0 pM, making it a potential strategy for biomedical analysis and disease diagnosis.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Wataru Yoshimune, Akira Kuwaki, Takumi Kusano, Takuro Matsunaga, Hiroshi Nakamura
Summary: Shape-controlled platinum nanoparticles with high oxygen reduction activity were synthesized using organic surfactants as a soft template in oleylamine. In situ experiments revealed the formation of anisotropic rod-shaped nanoparticles with different shapes appearing during the reaction process. The aspect ratio of the platinum nanoparticles was found to be correlated with the packing motifs of surfactant molecules, indicating the importance of interfacial structure in controlling nanoparticle shape and optimizing fuel cell performance.
Article
Chemistry, Multidisciplinary
Vindula Basnayake Pussepitiyalage, Shohreh Hemmati
Summary: Recent studies have shown that Pd nanorods (PdNRs) are highly effective in various applications, making them desirable nanocrystals. However, green synthesis methods have resulted in low PdNR yields in the past, making them less attractive compared to conventional methods. This study uses segmented millifluidic flow reactors (SMFRs) and l-ascorbic acid as a reducing agent to synthesize PdNRs with higher yields. By adjusting the Pd precursors and their molar ratios, the rate of oxidative etching and reduction can be controlled, leading to a yield of over 90% in this study.
Article
Chemistry, Multidisciplinary
Muneharu Minakawa, Makoto Nakagawa, Ke-Hsuan Wang, Yoshiro Imura, Takeshi Kawai
Summary: This study investigated the effect of introducing an amide group into the alkyl chain of amidoamine derivatives on the helical structure of nanofibers, and demonstrated that improving the solubility of 12-hydroxystearic acid by changing the gelation solvent is an effective method for preparing homogeneous nanofibers composed of two compounds.
Article
Chemistry, Multidisciplinary
Yoshiro Imura, Kunihiro Fukuda, Haruna Saito, Motoki Maniwa, Yusuke Kurihara, Clara Morita-Imura, Takeshi Kawai
Summary: In this study, different shape-controlled gold nanocrystals were prepared and compared for alcohol oxidation. Silica-coated gold nanorods exhibited better catalytic performance and thermal stability than gold nanorods.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2021)
Article
Chemistry, Multidisciplinary
Ke-Hsuan Wang, Genta Watanabe, Masaaki Yoshida, Yusaku Araki, Takeshi Kawai
Summary: This study reports a simple and feasible approach to fabricate hierarchical hollow sphere arrays of iron oxyhydroxide (FeOOH) via templating-assisted electro-deposition, and examines their electrochromic characteristics. The hierarchical hollow sphere arrays demonstrate a significant improvement in the switching kinetics and coloration efficiency, making them promising nanostructured electrochromic materials for applications in EC windows and other electronic and optical nanodevices.
Article
Chemistry, Multidisciplinary
Shun Tsunekawa, Arisu Sakai, Yoshiaki Tamura, Keisuke Hatada, Toshiaki Ina, Ke-Hsuan Wang, Takeshi Kawai, Masaaki Yoshida
Summary: A mineral electrocatalyst based on MnOOH was developed by applying a ball milling treatment to a naturally insulating ore. This catalyst effectively decomposed water molecules to generate oxygen. X-ray absorption spectroscopy analyses indicated that surface structural distortion provided the catalytically active sites. The formation of oxygen vacancies on natural ore surfaces is likely to be the key to developing efficient mineral electrocatalysts.
Article
Chemistry, Multidisciplinary
Yuto Arai, Nayuta Yashiro, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: The study demonstrates that introducing NaCl as an electrolyte into liquid emulsions provides a highly thermo-sensitive color-changing ability. The structural color of the emulsions can be controlled from red to blue by tuning the temperature. Furthermore, the C18AA and TOAB concentrations can independently regulate the color and coloring-temperature, so that the desired color can develop at a given temperature.
Article
Chemistry, Multidisciplinary
Yukie Kawasaki, Makoto Nakagawa, Tomoki Ito, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: This study demonstrates chiral transcription using helically controlled Au nanowires and achiral azobenzene derivatives. The self-assembly of achiral molecules successfully achieved the chiral transcription from the gold nanowires to the azobenzene derivatives.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2022)
Article
Chemistry, Multidisciplinary
Arisu Sakai, Kazuki Harada, Shun Tsunekawa, Yoshiaki Tamura, Masaya Ito, Keisuke Hatada, Toshiaki Ina, Takumi Ohara, Ke-Hsuan Wang, Takeshi Kawai, Masaaki Yoshida
Summary: An electrocatalyst based on a manganese carbonate mineral was obtained by ball milling rhodochrosite ore, and it was found to catalyze the water oxidation reaction in a stable manner. Analysis using X-ray absorption fine structure (XAFS) and theoretical simulations showed that the catalyst was composed of MnCO3 with slight distortions of the surface structure. Further studies determined that a portion of the MnCO3 surface was oxidized to MnO2, which likely provided active sites for the water oxidation reaction.
Article
Spectroscopy
Chechia Hu, Ke-Hsuan Wang, Yu-Yu Chen, Motoki Maniwa, Kun-Yi Andrew Lin, Takeshi Kawai, Wei Chen
Summary: In this study, nitrogen-doped carbon dots were prepared and used for the detection of metal ions through fluorescence quenching. Nitrogen doping significantly enhanced the fluorescence emission of the carbon dots, while the interaction between metal ions and surface-attached groups on the carbon dots resulted in fluorescence quenching. Therefore, this study provides a new approach for metal ion detection using carbon dots.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Rino Kaneko, Hiroto Ichikawa, Marika Hosaka, Yoshihiro Sone, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: Colloidal photolithography is an advanced technique for fabricating periodic nanopatterned arrays. In this study, the technique is applied to polystyrene films to create hole structures, convex patterns, and periodic silver nanoparticle spots.
Article
Chemistry, Multidisciplinary
Yusaku Araki, Shun Tsunekawa, Arisu Sakai, Kazuki Harada, Ryosuke Nagatsuka, Masako Suzuki-Sakamaki, Kenta Amemiya, Ke-Hsuan Wang, Takeshi Kawai, Masaaki Yoshida
Summary: Hydrogen production through water electrolysis is a potential solution to current energy problems. A hemispherical cavity cobalt catalyst with uniform pores was developed using electrodeposition on an ITO substrate. The cavity cobalt catalyst showed higher oxygen evolution current compared to a flat cobalt catalyst. In situ XAFS measurements indicated changes in the electronic state and local structure of the catalyst under working conditions.
Article
Chemistry, Physical
Fuyuki Nakagawa, Ryota Kichijo, Mizuki Matsukawa, Ke-Hsuan Wang, Yoshiro Imura, Takeshi Kawai
Summary: We have demonstrated a UV irradiation method to synthesize conductive silver nanosheets from monolayers of silver nanoparticles (AgNPs). The process involves the decomposition of a cationic water-insoluble surfactant under UV irradiation, which promotes sintering between AgNPs and converts their surfaces into conductive nanosheets. Additionally, AgNPs from the surrounding area infiltrate the UV-irradiated region, allowing the fabrication of nanosheets with loosely packed, low-density structures and numerous voids.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2023)
Article
Chemistry, Physical
Yu Someya, Tomoaki Aono, Takumi Yamamura, Takeshi Kawai
Summary: This study investigates the effect of alkyl chain length on the coloring behavior and temperature range of all-liquid colored materials, and finds that the coloring-temperature range can be significantly increased by shortening the chain length. Furthermore, adjusting the mixing ratio of CnAAs with different chain lengths allows for precise control of the coloring temperature.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Rino Kaneko, Hiroto Ichikawa, Marika Hosaka, Yoshihiro Sone, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: In this study, colloidal photolithography was used to fabricate periodic hole structures on polystyrene films. Non-spherical holes were also created by adjusting the UV illumination conditions. Additionally, convex patterns were achieved by combining weak UV illumination with solvent treatment. The study also demonstrated the deposition of periodic silver nanoparticle spots on polystyrene films by dissolving silver ions in water.
Article
Chemistry, Multidisciplinary
Ryota Kichijo, Naoya Miyajima, Daisuke Ogawa, Hirokazu Sugimori, Ke-Hsuan Wang, Yoshiro Imura, Takeshi Kawai
Summary: Metal nanowires have attracted attention as a promising one-dimensional nanomaterial due to their flexibility and conductivity. This study investigates the effect of different organic solvents on the morphology of metal nanowires and evaluates their surface-enhanced Raman scattering sensitivity.
Article
Chemistry, Multidisciplinary
Masashi Kuroiwa, Tatsuya Nishimura, Mizuki Matsukawa, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: It was found in the study that UV irradiation of Ag NPs on water resulted in the formation of large Ag NPs, but solubilization of additives in the water phase effectively led to the conversion of large Ag NPs into nanosheets, efficient for preparing transparent conductive Ag films with optical transmittance above 70%.
