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| 1 | Rapid Characterization of Ultrathin Layers of Chalcogenides on SiO2/Si Substrates显示文摘 | Dattatray J.Late BinLiu H. S. S. RamakrishnaMatte C. N. R.Rao Vinayak P.Dravid | 2012 | Adv. Funct. Mater2012，，9： | 1 |
| 2 | Computational strategies for design and discovery of nanostructured thermoelectrics显示文摘The contribution of theoretical calculations and predictions in the development of advanced high-performance thermoelectrics has been increasingly significant and has successfully guided experiments to understand as well as achieve record-breaking results.In this review,recent developments in high-performance nanostructured bulk thermoelectric materials are discussed from the viewpoint of theoretical calculations.An effective emerging strategy for boosting thermoelectric performance involves minimizing electron scattering while maximizing heat-carrying phonon scattering on many length scales.We present several important strategies and key examples that highlight the contributions of first-principles-based calculations in revealing the intricate but tractable relationships for this synergistic optimization of thermoelectric performance.The integrated optimization approach results in a fourfold design strategy for improved materials:(1)a significant reduction of the lattice thermal conductivity through multiscale hierarchical architecturing,(2)a large enhancement of the Seebeck coefficient through intramatrix electronic band convergence engineering,(3)control of the carrier mobility through band alignment between the host and second phases,and(4)design of intrinsically low-thermal-conductivity materials by maximizing vibrational anharmonicity and acoustic-mode Gruneisen parameters.These combined effects serve to enhance the power factor while reducing the lattice thermal conductivity.This review provides an improved understanding of how theory is impacting the current state of this field and helps to guide the future search for high-performance thermoelectric materials. | Shiqiang Hao Vinayak P.Dravid Mercouri G.Kanatzidis Christopher Wolverton | 2019 | npj Computational Materials2019，，1： | 0 |
| 3 | Thermoelectric transport enhancement of Te-rich bismuth antimony telluride(Bi_(0.5)Sb_(1.5)Te_(3+x))through controlled porosity显示文摘Alloys of Bi_(2)Te_(3) and Sb_(2)Te_(3) are the best performing p-type thermoelectrics near room temperature and have been the subject of extensive engineering efforts.Dramatic improvement is achieved by introducing defects that effectively scatter phonons and reduce thermal conductivity.Unfortunately,outstanding results are often difficult to reproduce as the process variables involved are difficult to control or possibly unknown.Here,a reproducible and controllable method of fabricating porous Bi_(0.5)Sb_(1.5)Te_(3+x) is presented.While effective medium theory(EMT)predicts no benefit,improvements in the thermoelectric quality factor,B(which determines the maximum zT of a materials),were as high as 45% parallel to the pressing direction for a sample of roughly 20% porosity.The study of microstructural evolution with increasing porosity is facilitated by a combination of Scanning/Transmission Electron Microscopy(S/TEM)and Electron Backscattered Diffraction(EBSD).This study reveals a statistically significant shift in the distribution of grain boundaries favoring lower energy twins,which coincides with an increase in the presence of stepped twin boundaries.This work demonstrates the potential benefits of careful grain boundary engineering and the need for further detailed studies of the dependence of thermal and electrical transport on grain boundary structure and orientation in these alloys. | Ian T.Witting Jann A.Grovogui Vinayak P.Dravid G.Jeffrey Snyder | 2020 | Journal of Materiomics2020，6，3： | 0 |
| 4 | Single-element amorphous palladium nanoparticles formed via phase separation显示文摘Physically vitrifying amorphous single-element metal requires ultrahigh cooling rates,which are still unachievable for most of the closest-packed metals.Here,we report a facile chemical synthetic strategy for single-element amorphous palladium nanoparticles with a purity of 99.35 at.%±0.23 at.%from palladium–silicon liquid droplets.In-situ transmission electron microscopy directly detected the solidification of palladium and the separation of silicon.Further hydrogen absorption experiment showed that the amorphous palladium expanded little upon hydrogen uptake,exhibiting a great potential application for hydrogen separation.Our results provide insight into the formation of amorphous metal at nanoscale. | Dong Sheng He Yi Huang Benjamin D.Myers Dieter Isheim Xinyu Fan Guang-Jie Xia Yunsheng Deng Lin Xie Shaobo Han Yang Qiu Yang-Gang Wang Junhua Luan Zengbao Jiao Li Huang Vinayak P.Dravid Jiaqing He | 2022 | Nano Research2022，15，6： | 0 |
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