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You searched for +publisher:"Harvard University" +contributor:("Lieber, Charles xmlui.authority.confidence.description.cf_uncertain"). Showing records 1 – 2 of 2 total matches.

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Harvard University

1. Day, Robert Watson. Crystal Growth on One-Dimensional Substrates: Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis.

Degree: PhD, 2015, Harvard University

Nanowires hold significant promise for both fundamental studies and technological applications ranging from energy conversion to electronics to biological sensing. The detailed understanding of nanowire synthesis and the realization of new synthetic approaches have enabled precise control over their size, morphology, and composition, and, consequently, their material properties. While much of the work on synthesis in the literature relates to axial nanowire growth, where growth proceeds in the direction of its long axis, this thesis has focused on probing the unique opportunities of shell growth, where material deposits radially around a nanowire core. To this end, I will show, first, that faceted Si core/shell nanowires can be synthesized with embedded pn junctions and that these structures can function as efficient photovoltaic devices with enhanced light absorption properties distinct from bulk Si devices. Second, through choice of reactants and reaction conditions used for shell growth, we demonstrate fine control over the size and morphology of these nanowires, which, in turn, drastically enhances their light absorption at particular wavelengths. Finally, we report for the first time a growth phenomenon that is unique to one-dimensional materials and which combines the underlying physics of the Plateau-Rayleigh instability with crystal growth. By exploiting this phenomenon, which we term Plateau-Rayleigh crystal growth, we demonstrate the growth of periodic shells on one-dimensional substrates. Specifically, we show that for conditions near the Plateau-Rayleigh instability the deposition of Si onto uniform-diameter Si cores, Ge onto Ge cores, and Ge onto Si cores can generate diameter-modulated core/shell nanowires. Rational control of deposition conditions enabled tuning of distinct morphological features, including diameter-modulation periodicity, amplitude and cross-sectional anisotropy. More generally, Plateau-Rayleigh crystal growth highlights the opportunities in understanding the thermodynamics and kinetics unique to crystal growth on nanowires and other low dimensional systems.

Chemistry and Chemical Biology

Advisors/Committee Members: Lieber, Charles xmlui.authority.confidence.description.cf_uncertain (advisor), Nocera, Daniel (committee member), Loncar, Marko (committee member).

Subjects/Keywords: Chemistry, Physical; Engineering, Materials Science; Chemistry, Inorganic

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Day, R. W. (2015). Crystal Growth on One-Dimensional Substrates: Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:17464133

Chicago Manual of Style (16th Edition):

Day, Robert Watson. “Crystal Growth on One-Dimensional Substrates: Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis.” 2015. Doctoral Dissertation, Harvard University. Accessed November 18, 2019. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17464133.

MLA Handbook (7th Edition):

Day, Robert Watson. “Crystal Growth on One-Dimensional Substrates: Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis.” 2015. Web. 18 Nov 2019.

Vancouver:

Day RW. Crystal Growth on One-Dimensional Substrates: Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis. [Internet] [Doctoral dissertation]. Harvard University; 2015. [cited 2019 Nov 18]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:17464133.

Council of Science Editors:

Day RW. Crystal Growth on One-Dimensional Substrates: Plateau-Rayleigh Crystal Growth and Other Opportunities for Core/Shell Nanowire Synthesis. [Doctoral Dissertation]. Harvard University; 2015. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:17464133

2. Jiang, Zhe. Novel nanowire structures and devices for nanoelectronic bioprobes.

Degree: PhD, 2015, Harvard University

Semiconductor nanowire materials and devices provide unique opportunities in the frontier between nanoelectronics and biology. The bottom-up paradigm enables flexible synthesis and patterning of nanoscale building blocks with novel structures and properties, and nano-to-micro fabrication methods allow the advantages of functional nanowire elements to interface with biological systems in new ways. In this thesis, I will focus on the development of bottom-up nanoscience platforms, which includes rational synthesis and assembly of semiconductor nanowires with new capabilities, as well as design and fabrication of the first free-standing three-dimensional (3D) nanoprobes, with special focus on applications in intracellular recording and stimulation. I will first introduce kinked p-n junction nanowires as a new and powerful family of high spatial resolution biological and chemical sensors with proof-of-concept applications. Next, I will discuss a variety of functional kinked nanowires with synthetically controlled properties and the potential of achieving more detailed and less invasive cellular studies. Furthermore, I will present a general shape-controlled deterministic nanowire assembly method to produce large-scale arrays of devices with well-defined geometry and position. Then, I will present the design of a general method to fabricate these nanowire structures into free-standing 3D probes. I will show that free-standing nanowire bioprobes can be manipulated to target specific cells and record stable intracellular action potentials. I will demonstrate simultaneous measurements from the same cell using both kinked nanowire and patch-clamp probes. Moreover, I will discuss two strategies of multiplexed recording using free-standing probes. Finally, I will report localized stimulation on single cells enabled by the unique properties of p-n kinked nanowires. I will show with simulation and electrical characterization that in reverse bias, localized electric field generated around the nanoscale p-n junction should exceed the threshold for opening voltage-gated sodium channels. Moreover, I will present measurements of localized cell stimulation using p-n nanowire free-standing probes. Together with the capability of stable intracellular recording, these results complete the two-way communication between semiconductor nanowire electronics and biological systems at a natural nanoscale, which can open up new directions in the fields ranging from cellular electrophysiology, brain activity mapping to brain-machine interface.

Chemistry and Chemical Biology

Advisors/Committee Members: Lieber, Charles xmlui.authority.confidence.description.cf_uncertain (advisor), Zhuang, Xiaowei (committee member), Nocera, Daniel (committee member).

Subjects/Keywords: Chemistry, General; Chemistry, Physical

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Jiang, Z. (2015). Novel nanowire structures and devices for nanoelectronic bioprobes. (Doctoral Dissertation). Harvard University. Retrieved from http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467307

Chicago Manual of Style (16th Edition):

Jiang, Zhe. “Novel nanowire structures and devices for nanoelectronic bioprobes.” 2015. Doctoral Dissertation, Harvard University. Accessed November 18, 2019. http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467307.

MLA Handbook (7th Edition):

Jiang, Zhe. “Novel nanowire structures and devices for nanoelectronic bioprobes.” 2015. Web. 18 Nov 2019.

Vancouver:

Jiang Z. Novel nanowire structures and devices for nanoelectronic bioprobes. [Internet] [Doctoral dissertation]. Harvard University; 2015. [cited 2019 Nov 18]. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467307.

Council of Science Editors:

Jiang Z. Novel nanowire structures and devices for nanoelectronic bioprobes. [Doctoral Dissertation]. Harvard University; 2015. Available from: http://nrs.harvard.edu/urn-3:HUL.InstRepos:17467307

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