Article
Materials Science, Multidisciplinary
Jinxuan Zhu, Qinghua Zhou, Yanyan Huang, Bo Zhou, Jiaxu Wang
Summary: The anisotropic deformation behavior of single crystalline copper materials under scratching was investigated in this study. A crystal plasticity finite element model was developed to simulate the scratching process, and the deformation mechanisms of (001)-, (101)- and (111)-oriented coppers were analyzed.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Xiaoyan Yu, Fangyuan Cheng, Kui Xie
Summary: Porous single crystals exhibit unique physical and chemical properties compared to irregular polycrystals, such as excellent electrical conductivity, large specific surface area, and low interfacial resistance, providing well-defined active sites for improved catalytic performance. This study demonstrates that well-shaped porous single-crystalline vanadium nitride octahedra have superior hydrogen evolution reaction performance compared to irregular porous polycrystalline vanadium nitride, inspiring the construction of long-range ordered porous single-crystalline materials for enhanced electrocatalytic performance.
NEW JOURNAL OF CHEMISTRY
(2022)
Article
Chemistry, Physical
Nikolay G. Petrik, Yang Wang, Bo Wen, Yiqing Wu, Runze Ma, Arjun Dahal, Feng Gao, Roger Rousseau, Yong Wang, Greg A. Kimmel, Annabella Selloni, Zdenek Dohnalek
Summary: The study investigates thermal-induced reactions of formic acid on metal oxide surfaces, particularly on single-crystalline and nanocrystalline anatase TiO2(101). Various techniques including STM, TPD, IRAS, DRIFTS, and DFT were used to analyze surface intermediates and reaction products. The primary reaction products were identified as molecular water, carbon monoxide, and formaldehyde, with bidentate formate and bridging hydroxyl as central intermediates. Bridging oxygen vacancies were also found to be potential participants despite their low stability.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Elisabeth Hornberger, Valentina Mastronardi, Rosaria Brescia, Pier Paolo Pompa, Malte Klingenhof, Fabio Dionigi, Mauro Moglianetti, Peter Strasser
Summary: This research presents a seed-templated approach for the preparation of ultrasmall octahedral platinum nanoparticles with a size of 6.7 nm, demonstrating higher catalytic activity and stability compared to traditional spherical platinum nanoparticles. The octahedral shape shows a higher electrochemical active surface area and specific ORR activity in the oxygen reduction reaction compared to spherical particles of the same size.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Eunwook Jeong, Yoshifumi Ikoma, Taehyeong Lee, Hyejin Kim, Seung Min Yu, Sang-Geul Lee, Jong-Seong Bae, Seung Zeon Han, Gun-Hwan Lee, Dooho Choi, Eun-Ae Choi, Jungheum Yun
Summary: This study reports a method for fabricating an ultrathin, highly crystalline, complexly continuous Cu layer mediated by Ge. The segregation of Ge remarkably enhances the wetting of Cu layer on ZnO substrate. The Cu layer fabricated by this method exhibits a record-low optical loss at near-bulk resistivity and exceptional durability in water, ozone, and high-temperature environments.
Article
Chemistry, Multidisciplinary
Can Li, Soonho Kwon, Xiaobo Chen, Lihua Zhang, Anju Sharma, Shaojie Jiang, Hanlei Zhang, Ming Zhou, Jinfong Pan, Guangwen Zhou, William A. Goddard, Jiye Fang
Summary: This study demonstrates that selectively extracting Ni atoms from the {111} facets of Pt-Ni nano-octahedra and forming a Pt-rich shell results in a surface-engineered octahedral nanocatalyst with enhanced electro-catalytic performance. The surface-engineered sample exhibits significantly improved mass activity (approximately 1.8-fold) and specific activity (approximately 2.2-fold) for the oxygen reduction reaction compared to the unmodified counterpart. The results suggest that this surface-engineering protocol provides a promising strategy for developing novel electrocatalysts with improved catalytic features.
Article
Electrochemistry
Jagadeesh Sure, D. Sri Maha Vishnu, Carsten Schwandt
Summary: In this study, nano-size equiatomic CoCrFeNi HEA powder was successfully prepared by electro-deoxidation method, which showed a well-formed crystal structure and accurate composition, providing an effective approach for the production of high-entropy alloy powders.
ELECTROCHEMISTRY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Can Li, Xiaobo Chen, Lihua Zhang, Shaohui Yan, Anju Sharma, Bo Zhao, Amar Kumbhar, Guangwen Zhou, Jiye Fang
Summary: The study successfully prepared octahedral CuNi@Pt-Cu core@shell nanocrystals using a colloidal seed-mediated method, achieving uniform Pt-based shells with a thickness of less than 1 nm by precisely controlling synthesis conditions. The resulting nano-octahedra exhibited superior activity in electrochemical methanol oxidation reaction compared to commercial Pt/C catalysts and nano-polyhedron counterparts of CuNi@Pt-Cu.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Electrical & Electronic
Purvika Agarwal, Debajeet K. Bora
Summary: The research reveals the presence of both 2-fold and 3-fold icosahedral quasicrystal symmetries, as well as Moire Fringes, within the single crystal hematite nano octahedron. This nano octahedron is grown from a FeOCl (Iron oxychloride) based nucleation center, obtained through the thermal decomposition of FeCl3.6H2O in the presence of oleic acid and Urea over time.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Multidisciplinary
Yuxia Feng, Xuelin Yang, Zhihong Zhang, Jie Zhang, Jiaqi Wei, Lixing Zhou, Kaihui Liu, Fujun Xu, Weikun Ge, Bo Shen
Summary: The AlN nucleation layer plays a significant role in the epitaxial growth of single-crystalline GaN on single-crystalline graphene, providing orientation driving force and increasing nucleation density. The insights gained from this research can be applied to epitaxy of other materials on diverse two-dimensional materials.
Article
Chemistry, Physical
Fangxian Cao, Mingkai Zhang, Kaili Yang, Zhimin Tian, Jing Li, Yongquan Qu
Summary: In this study, uniform single crystalline CeO(2) nanotubes were successfully prepared through a hydrothermal transformation of CeO(2) nanorods in aqueous Ce(NO3)3 solution. A chemically driven etching-dissolution-deposition mechanism was proposed to explain the formation process of CeO(2) nanotubes, which exhibited higher activity compared to CeO(2) nanorods.
Review
Chemistry, Multidisciplinary
Lipiao Bao, Ting Xu, Kun Guo, Wenhuan Huang, Xing Lu
Summary: This review discusses the morphological evolution mechanism of supramolecularly assembled fullerene micro-/nano-architectures (FMNAs) and explores strategies to precisely regulate their dimensions and morphologies through solvent engineering, co-crystallization, surfactant incorporation, or post-fabrication treatment. It focuses not only on C-60-based FMNAs, but also on FMNAs comprising higher fullerenes (e.g., C-70) and metallofullerenes. The review summarizes the multidisciplinary applications of FMNAs in various fields, such as sensors, optoelectronics, biomedicines, and energy, and provides prospects for future research, application opportunities, and challenges associated with FMNAs.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Wenting Li, Xiaotian Guo, Pengbiao Geng, Meng Du, Qingling Jing, Xudong Chen, Guangxun Zhang, Hongpeng Li, Qiang Xu, Pierre Braunstein, Huan Pang
Summary: In this study, a series of Mn-based multimetallic MOF nano-octahedra were successfully prepared by a facile one-pot synthetic strategy. These nano-octahedra were used as sulfur hosts to prepare cathodes for Li-S batteries, with MnNi-MIL-100@S cathode exhibiting the best performance. The strategy described here allows for the incorporation of metal ions into MOF architecture, leading to the rational generation of novel multimetallic MOFs, and enables the general synthesis and study of various micro-/nanoscale MOFs in the field of energy storage.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Shuo Zhang, Xiao Cheng, Junyun Chen
Summary: Compared with conventional orthogonal cutting, this study systematically investigates the oblique nano-cutting of 6H-SiC by tilting the tool at different angles through molecular dynamics simulations. The deformation mechanism, surface deformation, and cutting force variation are studied, and the transition path of amorphization is clarified. Dislocation analysis reveals that basal dislocation systems dominate the behavior, while in oblique nano-cutting, the basal 1/3 < 1 (1) over bar 00> Shockley partial dislocation of 6H-SiC is more activated due to the inclined-cutting-edge-derived shear stress.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Industrial
Huan Liu, Yongbo Guo, Duo Li, Jiqiang Wang
Summary: An analytical model was proposed to predict the chip thickness and ploughing width for FCC crystal materials under arbitrary crystal orientations in nano-machining. The results indicate that the crystal orientation determines the transformation between chip removal and ploughing, offering insights into the machining mechanisms for FCC crystals at the nanoscale.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Chemistry, Physical
Stephen A. Lee, Behnaz Ostovar, Christy F. Landes, Stephan Link
Summary: Plasmon-induced charge transfer has been studied for the development of plasmonic photodiodes and solar cells. Two mechanisms of charge transfer from plasmonic nanoparticles to adjacent materials are identified and quantitatively related to spectroscopic signatures. The spectroscopic analysis reveals insights into the mechanisms of electron-hole recombination and plasmon generation and decay within the gold nanorods, and identifies material parameters contributing to charge transfer efficiency.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Lauren A. Warning, Ali Rafiei Miandashti, Anastasiia Misiura, Christy F. Landes, Stephan Link
Summary: This study investigates the aggregation mechanism of chiral protein-nanorod assemblies templated by serum albumin. The results show that the identity/shape of the protein, the protein/nanorod ratio, and surfactants all play a role in the aggregation process. The crowdedness of proteins influences their conformation and protein-protein interactions, which directs the formation of preferentially left- or right-handed structures. The findings in this study provide opportunities for future chiral nanostructure engineering and biosensing applications.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Claire A. West, Stephen A. Lee, Jesse Shooter, Emily K. Searles, Harrison J. Goldwyn, Katherine A. Willets, Stephan Link, David J. Masiello
Summary: Although originally designed for detecting individual molecules or small nanoparticles, photothermal imaging is now used to characterize larger structures that scatter light strongly. The interpretation of the photothermal signal in this regime requires revisiting fundamental assumptions. Theoretical analyses reveal nonlinearity in the photothermal signal with pump intensity and contraction of the point spread function, and show deviations between photothermal spectra and absorption spectra at higher pump intensities. Companion experiments on gold nanoparticles confirm the theoretical predictions and demonstrate new aspects of photothermal imaging.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Emily K. Searles, Eric Gomez, Stephen Lee, Behnaz Ostovar, Stephan Link, Christy F. Landes
Summary: Single-particle spectroelectrochemistry is a valuable tool for understanding physical and chemical changes at the nanoscale. This study focuses on the less explored changes in the photoluminescence of plasmonic nanoparticles under electrochemical charging, using correlated single-particle photoluminescence and dark-field scattering. The results show that changes in the emission of a single gold nanorod during charge density tuning can be attributed to variations in the Purcell factor and absorption cross section. Additionally, modulation of interband photoluminescence provides a potential dual channel sensing approach in spectroelectrochemical measurements.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Hanyi Duan, Zhenyang Jia, Maham Liaqat, Matthew D. Mellor, Haiyan Tan, Mu-Ping Nieh, Yao Lin, Stephan Link, Christy F. Landes, Jie He
Summary: Control of interparticle interactions by anisotropic ligand grafting on NP building blocks. Ligand deficiency exchange strategy achieved site-specific polymer grafting of AuNRs. Dumbbell-like AuNRs with controllable surface coverage can be synthesized through surface dewetting and exhibit great colloidal stability.
Article
Chemistry, Physical
Stephan Link, Niklas Gross, Mahyar Madadi, Behnaz Ostovar, Pratiksha D. Dongare, Lauren A. McCarthy, Wei-Yi Chiang, Wei-Shun Chang, Naomi J. Halas, Christy F. Landes, John E. Sader
Summary: We investigate the effect of substrate-particle binding strength on the vibrational Q-factor of lithographically prepared gold nanodisks. Strong binding leads to higher acoustic Q-factors, and we propose an approach to tune enhanced acoustic Q-factors of nanoparticles.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Alexander Al-Zubeidi, Yufei Wang, Jiamu Lin, Charlotte Flatebo, Christy F. Landes, Hang Ren, Stephan Link
Summary: We utilize the d-band hole-enhanced dissolution of gold nanorods as a model reaction to determine that d-band holes selectively drive reactions at the tips of the nanorods, increasing the rate of electrodissolution. The dissolution enhancement exclusively occurs at the tips of the nanorods upon illumination with 488 nm light, consistent with previous theoretical predictions.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Stephen A. Lee, Christopher T. Kuhs, Emily K. Searles, Henry O. Everitt, Christy F. Landes, Stephan Link
Summary: In this study, time-resolved emission upconversion microscopy was used to investigate the lifetime and energy-dependent cooling of d-band holes formed in gold nanoparticles by plasmon excitation and decay.
Article
Chemistry, Multidisciplinary
Hyuncheol Oh, Emily K. Searles, Subhojyoti Chatterjee, Zhenyang Jia, Stephen A. Lee, Stephan Link, Christy F. Landes
Summary: In this study, resonance energy transfer (RET) between gold nanorods (AuNRs) and methylene blue (MB) was achieved using in situ single-particle spectroelectrochemistry, which eliminated the internal conversion and promoted efficient plasmonic photocatalysis.
Article
Chemistry, Physical
Niklas Gross, William Wang, Sadie Brasel, Emily K. Searles, Briley Bourgeois, Jennifer A. Dionne, Christy F. Landes, Stephan Link
Summary: The optical applications of plasmonic nanoparticles rely on properties such as their relative proximity, composition, crystallinity, and shape. The scanning probe block copolymer lithography (SPBCL) technique offers high throughput, precise particle positioning, and composition control. In this study, large arrays of gold nanoparticles with varying shapes were fabricated on glass supports using SPBCL. The resulting nanoparticles exhibited strong plasmon resonances and high crystallinity, supporting both plasmon oscillations and mechanical vibrations with lifetimes comparable to colloidal nanospheres.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Wei-Yi Chiang, Autumn Bruncz, Behnaz Ostovar, Emily K. Searles, Sadie Brasel, Gregory Hartland, Stephan Link
Summary: We conducted a study on the pump wavelength-dependent electron-phonon relaxation in colloidal solutions of isolated gold nanospheres and nanorods. The electron-phonon relaxation time was found to be independent of pump wavelength and the plasmon bleach recovery dynamics described the cooling process of hot thermalized electrons with the lattice. A nonlinear trend in the electron-phonon relaxation time was observed when the nanorods were excited at the longitudinal mode with linearly polarized excitation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Annette Jones, Emily K. Searles, Martin Mayer, Marisa Hoffmann, Niklas Gross, Hyuncheol Oh, Andreas Fery, Stephan Link, Christy F. Landes
Summary: By eliminating contributions from heterogeneous line width broadening and refractive index changes, efficient resonance energy transfer (RET) between AuNRs and PANI is revealed in AuNR-PANI hybrid systems, which dominates the optical response during the dynamic tuning of the spectral overlap.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Ben Roche, Tamie Vo, Wei-Shun Chang
Summary: In this study, gold nanorods functionalized with polyvinylpyrrolidone were used to enhance the photocatalytic reduction of gold ions. The reaction was quantified by monitoring the spectral evolution of single nanorods using a dark-field scattering microscope. The results showed a significant increase in reduction rate with excitation of d-sp interband transition, while the excitation of intraband transition had negligible effect. The enhanced photocatalysis was attributed to efficient charge separation at the gold-polyvinylpyrrolidone interface.
Article
Chemistry, Physical
Emily K. Searles, Eric Gomez, Stephen Lee, Behnaz Ostovar, Stephan Link, Christy F. Landes
Summary: Single-particle spectroelectrochemistry is a valuable technique for studying physical and chemical changes on the nanoscale. In this study, the changes in photoluminescence and dark-field scattering of plasmonic nanoparticles under applied potentials were compared. The results showed that the modulation of intraband photoluminescence was attributed to changes in the Purcell factor and absorption cross section. Moreover, modulation of interband photoluminescence showed promise for dual channel sensing in spectroelectrochemical measurements.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Zhengyi Bian, Alison Wallum, Arshad Mehmood, Eric Gomez, Ziwen Wang, Subhendu Pandit, Shuming Nie, Stephan Link, Benjamin G. Levine, Martin Gruebele
Summary: A major challenge in the bottom-up solvothermal synthesis of carbon dots is the removal of small-molecule byproducts or other impurities that affect their optical properties. In this study, the small-molecule species in the synthesis of carbon dots were identified and the reaction mixtures were purified, allowing for a detailed analysis of their properties. The results have important implications for achieving full-spectrum fluorescence from isomers of a single precursor molecule.
