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Nanotechnology

Nanometrology

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Displaying 151 - 175 of 866

Interface Engineering for Nanoelectronics

August 16, 2017
Author(s)
Christina A. Hacker, Robert C. Bruce, Sujitra J. Pookpanratana
Innovation in the electronics industry is tied to interface engineering as devices increasingly incorporate new materials and shrink. Molecular layers offer a versatile means of tuning interfacial electronic, chemical, physical, and magnetic properties

Strain engineering a 4a*?3a charge-density-wave phase in transition-metal dichalcogenide 1T-VSe2

July 19, 2017
Author(s)
Duming Zhang, Jeonghoon Ha, Hongwoo H. Baek, Yang-Hao Chan, Donat F. Natterer, Alline Myers, Joshua D. Schumacher, William Cullen, Albert Davydov, Young Kuk, Mei-Yin Chou, Nikolai Zhitenev, Joseph A. Stroscio
We report a new charge density wave (CDW) structure in strained 1T-VSe2 thin films synthesized by molecular beam epitaxy. The CDW structure is unconventional and exhibits a rectangular 4a×√3a periodicity, as opposed to the previously reported hexagonal 4a

Quantitative characterization of gold nanoparticles by size-exclusion and hydrodynamic chromatography, coupled to inductively coupled plasma mass spectrometry and quasi-elastic light scattering

July 14, 2017
Author(s)
Leena M. Pitkanen, Antonio Montoro Bustos, Karen E. Murphy, Michael R. Winchester, Andre Striegel
The physicochemical characterization of nanoparticles, in general, and of gold nanoparticles (Au NPs), in particular, is of paramount importance for tailoring and optimizing the properties of these materials in specific applications, as well as for

A bottom-up approach for traceable nano dimensional metrology

May 29, 2017
Author(s)
Gaoliang Dai, Jens Fluegge, Harald Bosse, Ronald G. Dixson
This paper presents a bottom-up approach which uses the transmission electron microscopy (TEM) and the reference value of the crystal silicon lattice constant as a pathway for traceability to the SI metre for applications in dimensional nanometrology

An On/Off Berry Phase Switching with Circular Graphene Resonators

May 26, 2017
Author(s)
Fereshte Ghahari Kermani, Daniel T. Walkup, Christopher Gutierrez, Joaquin R. Nieva, Yue Y. Zhao, Jonathan E. Wyrick, Donat F. Natterer, William G. Cullen, Kenji Watanabe, Takashi Taniguchi, Leonid Levitov, Nikolai B. Zhitenev, Joseph A. Stroscio
Berry phase is an example of anholonomy, where the phase of a quantum state may not return to its original value after its parameters cycle around a closed path; instead the quantum system’s wavefunction may acquire a real measurable phase difference

Trion Valley Coherence in Monolayer Semiconductors

May 22, 2017
Author(s)
Kai Hao, Lixiang Xu, Wu Fengcheng, Philip Nagler, Kha Tran, Xin Ma, Tobias Korn, Allan H. MacDonald, Xiaoqin Li, Galan Moody
The emerging field of valleytronics aims to exploit the valley pseudospin of electrons residing near Bloch band extrema as an information carrier. Recent experiments demonstrating optical generation and manipulation of exciton valley coherence (the

Direct evidence of atomic-scale structural fluctuations in catalyst nanoparticles

May 1, 2017
Author(s)
Pin Ann Lin, Jose Gomez-Ballesteros, Juan Burgos, Perla Balbuena, Bharath N. Natarajan, Renu Sharma
A heterogeneous catalyst usually works by letting the reactant adsorb onto its surface where the energies for specific bonds to dissociate and/or combine with other species (to form desired intermediate or final products) are lower. Rational catalyst

Nanoscale Structure-Property Characterization of a Nanopatterned Hybrid Organic-Inorganic Nanoporous Material

April 13, 2017
Author(s)
Gheorghe Stan, Richard S. Gates, Qichi Hu, Kevin Kjoller, Craig Prater, Alan Myers, Kanwal Singh, Ebony Mays, Sean W. King
The continued advancement of nanostructured materials and exploitation of nanoscale size effects will ultimately require understanding material structure-property relationships at the nanoscale. Despite a plethora of metrologies capable of characterizing

Nanoscale Imaging and Spectroscopy of Band Gap and defects in Polycrystalline Photovoltaic Devices

April 12, 2017
Author(s)
Yohan Yoon, Jungseok Chae, Aaron M. Katzenmeyer, Heayoung Yoon, Joshua D. Schumacher, Sang M. An, Andrea Centrone, Nikolai B. Zhitenev
Improving the power conversion efficiency of photovoltaic (PV) devices is challenging because the generation, separation and collection of electron-hole pairs in PV devices is strongly dependent on details of the nanoscale chemical composition and defects
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