Cited time in webofscience Cited time in scopus

Full metadata record

DC Field Value Language
dc.contributor.advisor 김철기 - Muhammad Syafiq bin Ahmad - 2020-06-22T16:01:56Z - 2020-06-22T16:01:56Z - 2020 -
dc.identifier.uri en_US
dc.identifier.uri -
dc.description Template-assisted electrodeposition, magnetic nanowires, PHR sensor, flow sensor -
dc.description.abstract Over millennia of evolution, animals have developed exceptional receptors such as lateral line system of fishes and sensory hairs in insects. This hair-like structures is a part of sensory system used to detecting external stimuli and changes around the animals. With the aid of current fabrication technology, an engineering equivalent artificial hair-like (AHL) sensors were developed to imitate the structure and function of the biological hairs on animals. The AHL sensors can be operated based on several principles such as magnetic, piezoresistive, and piezoelectric. This Theses presents the results obtained during the development of magnetic based artificial hair-like sensor as a feasible flow sensor.
Here, the study demonstrates the ability to fabricate vertically aligned multisegment nanowires on planar Hall resistance (PHR) sensor via template-assisted electrodeposition. Nanowires consisting of Au and CoNiP segments were grown into polycarbonate (PC) membrane with its corresponding length controlled during the fabrication process. The nanowires are 250 nm in diameter and 6 µm long with the average length of Au and CoNiP measured to be 5 µm and 1 µm respectively. Elemental composition of the nanowires specifically for CoNiP segment were also quantified to confirm the percentage of said element present inside the nanowires.
The magnetic properties of the nanowires were measured in applied magnetic field parallel and perpendicular to nanowires long axis. Coercivity of the nanowires along and perpendicular to nanowire long axis were calculated to be 1850 Oe and 1820 Oe respectively. Additionally, the effect of nanowire’s crystal structure and CoNiP segment length on its magnetic properties were also investigated in this work.
The PHR sensor profile was analyzed and its field sensitivity was calculated to be 1.1 µV/Oe in the low field region. An average voltage changes of 22 µV was observed after Au/CoNiP nanowires were deposited on the sensor surface. Voltage signal increase up to 0.06 µV from the baseline as air was blown towards the nanowires, thus proving the viability of this sensor to sense air flow.
dc.description.statementofresponsibility prohibition -
dc.description.tableofcontents ABSTRACT i
Table of Contents iii
List of Tables iv
List of Figures iv
2.1 Template-assisted synTheses of metal nanowires 3
2.1.1 “Track-etched” polycarbonate membrane 4
2.2 Planar Hall magnetoresistive (PHR) sensor 5
3.1 Materials 8
3.2 Fabrication of vertically aligned Au/CoNiP nanowires 8
3.2.1 Gold-coated Silicon Substrate 8
3.2.2 Polycarbonate membrane attachment on substrate 9
3.2.3 Electrodeposition of nanowires 11
3.3 Fabrication of sensor with Au/CoNiP nanowire 13
3.3.1 Fabrication of pattern 13
3.3.2 Fabrication of cross-type PHR sensor 14
3.3.3 Electrodeposition of nanowires 15
3.4 Characterization 15
3.4.1 Scanning Electron Microscopy (SEM) 15
3.4.2 X-ray diffraction (XRD) 16
3.4.3 Vibrating Sample Magnetometer (VSM) 16
3.4.3 Magnetoresistance (MR) measurement 17
4.1 Fabrication of vertically aligned nanowires 19
4.1.1 Nanowire dimension 19
4.1.2 Growth Mechanism 22
4.1.3 PC membrane attachment on substrate 25
4.2 Magnetic properties of nanowires 28
4.3 Characterization of sensor 34
요 약 문 43
dc.format.extent 43 -
dc.language eng -
dc.publisher DGIST -
dc.title Vertically Aligned Au/CoNiP Multisegment Nanowires for Biomimetic Artificial Hair-like Smart Sensor -
dc.type Thesis -
dc.identifier.doi 10.22677/Theses.200000283759 -
dc.description.alternativeAbstract 동물들은 수천년 동안의 진화를 거치면서 특수한 감각 기관을 가지게 되었다. 그 예시로는 물고기의 측면선 시스템과 곤충의 감각 털 등이 있다. 이와 같은 감각 기관은 동물 주위의 외부 자극과 변화를 감지하는 데 사용되는 감각 시스템의 한 부분이다. 현재의 제조기술의 발달로, 동물의 생물학적 털의 구조와 감각 기능을 모방한 인공 모발(AHL) 센서가 개발되었다. AHL 센서는 자기, 압저항 및 압전기와 같은 몇 가지 원리에 기초하여 작동할 수 있다. 본 연구는 자성 원리에 기초하여 작동하는 인공 모발형 센서를 개발하고, 유량 센서로써의 활용 가능성을 제시한다.
템플릿 기반 전해도금 방식을 통해, PHR 센서표면에 수직방향으로 정렬된 나노와이어를 증착하여 인공 모발형 센서를 제작하였다. 나노와이어는 폴리카보네이트(PC) 템플릿 막 안에서 Au와 CoNiP를 성장시키며 제작되었다. 나노와이어는 직경 250nm, 길이 6μm이며, Au와 CoNiP의 평균 길이는 각각 5μm와 1μm로 측정되었다. CoNiP을 포함한 나노와이어의 원소 구성 비율은 EDS를 이용하여 정량적으로 확인되었다.
나노와이어의 자기적 성질은 외부 자기장이 나노와이어 장축과 평행한 상태와 수직한 상태에서 측정되었다. 나노와이어의 보자력은 외부 자기장이 나노와이어 장축에 평행 혹은 수직할 때 각각 1850 Oe와 1820 Oe로 측정되었다. 또한, 나노와이어의 결정 구조와 CoNiP의 길이가 자기적 성질에 미치는 영향도 조사되었다.
PHR 센서 프로파일 분석하여 약한 자기장 영역에서 센서의 감도가 1.1μV/Oe로 계산됨을 알 수 있었다. Au/CoNiP 나노와이어가 센서 표면에 증착된 후 평균적으로 22μV의 전압 변화가 관찰되었다. 또한, 센서 표면을 향해 공기를 불어넣었을 때 0.06μV의 전압 변화가 관찰되었으므로 공기 흐름 등의 유량의 변화를 감지할 수 있는 유량 센서로써 본 센서를 활용할 수 있을 것이다.
- Master -
dc.contributor.department Emerging Materials Science -
dc.contributor.coadvisor SeokSoo Yoon - 2020-02 -
dc.publisher.location Daegu -
dc.description.database dCollection -
dc.citation XT.MM 무92 202002 - 2020-01-20 -
dc.contributor.alternativeDepartment 신물질과학전공 -
dc.embargo.liftdate 2024-12-31 -
dc.contributor.affiliatedAuthor Ahmad, Muhammad Syafiq bin -
dc.contributor.affiliatedAuthor Yoon, SeokSoo -
dc.contributor.affiliatedAuthor Kim, CheolGi -
dc.contributor.alternativeName 무함마드 샤피크 빈 아흐마드 -
dc.contributor.alternativeName CheolGi Kim -
dc.contributor.alternativeName 윤석수 -
Files in This Item:

There are no files associated with this item.

Appears in Collections:
Department of Physics and Chemistry Theses Master


  • twitter
  • facebook
  • mendeley

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.