國立虎尾科技大學 |

Self-assembly of nanowires and microparts for integration of NEMS/MEMS.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Self-assembly of nanowires and microparts for integration of NEMS/MEMS./
Author:	Liu, Mei.
Description:	1 online resource (159 pages)
Notes:	Source: Dissertation Abstracts International, Volume: 72-07, Section: B, page: 4251.
Contained By:	Dissertation Abstracts International72-07B.
Subject:	Materials science. -
Online resource:	click for full text (PQDT)
ISBN:	9780494735169

Self-assembly of nanowires and microparts for integration of NEMS/MEMS.
Liu, Mei.

Self-assembly of nanowires and microparts for integration of NEMS/MEMS. - 1 online resource (159 pages)

Source: Dissertation Abstracts International, Volume: 72-07, Section: B, page: 4251.

Thesis (Ph.D.)--The University of Western Ontario (Canada), 2010.

Includes bibliographical references

Applications of self-assembly at nanoscale and microscale are investigated. At nanoscale, multiple nanowires arrays with precise control of their density, width and position were assembled efficiently on substrates by hydrodynamic focusing. Single nanowire alignment was also obtained. At microscale, multiple batches of microparts were assembled onto a common planar or nonplanar substrate by utilizing different solders for bonding.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9780494735169Subjects--Topical Terms:

557839
Materials science.
Index Terms--Genre/Form:

554714
Electronic books.

Self-assembly of nanowires and microparts for integration of NEMS/MEMS.
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245 1 0 $a Self-assembly of nanowires and microparts for integration of NEMS/MEMS.
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500 $a Source: Dissertation Abstracts International, Volume: 72-07, Section: B, page: 4251.
502 $a Thesis (Ph.D.)--The University of Western Ontario (Canada), 2010.
504 $a Includes bibliographical references
520 $a Applications of self-assembly at nanoscale and microscale are investigated. At nanoscale, multiple nanowires arrays with precise control of their density, width and position were assembled efficiently on substrates by hydrodynamic focusing. Single nanowire alignment was also obtained. At microscale, multiple batches of microparts were assembled onto a common planar or nonplanar substrate by utilizing different solders for bonding.
520 $a The aim of the investigation on the self-assembly of nanowires is to provide a feasible tool for massive integration of nanowires into functional devices, since nanowires and nanotubes are the basic components of nanodevices, and have numerous outstanding characteristics. The assembly of nanowires was controlled by combining multiple mechanisms of hydrodynamic focusing, shear force and surface interactions. In the process of self-assembly by hydrodynamic focusing, the sample flow was the nanowire solution, while the sheath flow was deionized water. The nanowires suspended in the solution were forced to follow the stream line by shear force. The interaction between the nanowires and their underlying microchannel surface led to attachment of nanowires on the surface in the flow direction. Since only the sample flow contained nanowires, the sample flow covered areas were solely covered with nanowires. By tuning the flow rate ratio between the sheath flow and the sample flow as well as the flow duration, the density, width and position of assembled nanowire array could all be readily adjusted. Silver nanowires arrays of different width and density have been demonstrated in the thesis. As a typical application, conductivity of silver nanowires has been characterized in self-assembly integrated nanodevices using a probe station. This approach is compatible with most structural materials in micro/nanofabrication, and provides a novel solution for the bottom-up construction of nanodevices such as nanowire-based sensors.
520 $a The focus of the second part of this thesis is to develop a self-assembling approach for complex microsystems. The miniaturization process in microfabrication makes robotic assembly of microsystems more difficult. As a promising alternative, self-assembly techniques have the advantages of high efficiency, compatibility with hybrid materials, and the ability to assemble microparts ranging from millimeters to micrometers. In this thesis, self-assembly approach was applied to integrate multiple batches of microparts onto planar or nonplanar substrates. Multiple-batch self-assembly was obtained by applying several kinds of solders with different melting points on the specified binding sites. Increasing the system temperature sequentially, different kinds of microparts were assembled step by step onto the substrate. Since the solder of the lowest melting point was activated only at the lowest system temperature for assembly, the first batch of microparts could be assembled without attaching to inactivated binding sites. By increasing the temperature sequentially, more batches of microparts can be introduced and assembled. The previously assembled microparts helped preventing assembly of subsequent microparts onto previously activated binding sites. The self-assembly process can be carried out on both planar and nonplanar substrates, reflecting the extensive field of application of the approach.
520 $a The methods presented in this thesis are also applicable to nanowires and microparts made of other structural materials. The knowledge gained from the present study is envisaged to benefit the design and analysis of integration technique of next generation of NEMS/MEMS devices.
520 $a KEYWORDS: MEMS/NEMS, Self-assembly, Nanotechnology, Nanowires, Hydrodynamic focusing, Nanowires assembly, Soft-lithography, Micro-parts, Solder, Melting points.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Materials science. $3 557839
650 4 $a Electrical engineering. $3 596380
650 4 $a Mechanical engineering. $3 557493
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710 2 $a The University of Western Ontario (Canada). $3 1184598
773 0 $t Dissertation Abstracts International $g 72-07B.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR73516 $z click for full text (PQDT)