Methodological constraints for microwave-assisted and aqueous chemical growth of ZnO nanostructures and their applications
저자
발행사항
서울: 동국대학교, 2018
학위논문사항
학위논문(박사) 동국대학교 대학원: 전자전기공학과 2018. 8
발행연도
2018
작성언어
영어
DDC
621.381 판사항(22)
발행국(도시)
서울
형태사항
xvii, 117 p.: 삽도; 26 cm.
일반주기명
동국대학교 논문은 저작권에 의해 보호받습니다.
지도교수: Hyun-Seok Kim
UCI식별코드
I804:11020-000000077580
DOI식별코드
소장기관
Twentieth century was the century of computers however the contemporary era
is plagued with nanotechnology. It is so pervasive that it’s everywhere around
encompassing almost all the fields of science and engineering. Nanoelectronics is
the use of nanotechnology in manipulating and effectively influencing the physics
and characteristics of electronic components on nanometer scale. The scalability of
the nanoelectronic devices has even allowed scientists to study the quantum
mechanical characteristics of materials under observation. It has revolutionized the
industrial development in the realm of transportation, automobile sector, homeland
security, medicine, instrumentation, quantum computing, and electronic and display
industry to name a few.
ZnO has been emerged as a new material in research and development in
semiconductor science and engineering technology. It has wide and direct band gap
of 3.37 eV, large excitonabindingaenergy of 60mmeV at roomttemperature,
transparency, high intrinsic electron mobility, and high thermal conductivity. Based
upon its alluring properties and ease of fabrication process, it has myriad of
applications in the realm of optoelectronics, thermoelectronics, wearable electronics,
flexible electronics, biotechnology, sensors, lasing, transistors, and piezoelectric
devices.
This dissertation is focused on the methodological constraints for microwaveassisted
and aqueous chemical growth of ZnO nanostructures and their applications.
ZNSs were grown on different substrates via aforementioned growth methods, where
the methodological constraints of both methods for ZNS growth is also probed.
Different morphology ZNSs, such as ZnO nanorods (ZNRs), nanoflowers (ZNFs),
nanotubes (ZNTs), nanostars, nanotetrapods, nanowalls, nanopyramids, and
nanoneedles, were fabricated by judiciously controlling the solution pH by adding
certain surfactants to the solutions. The ZNRs were also doped with gallium (Ga) to
control the optical and electrical characteristics of ZNRs for heterostructure
optimization.
The first part of the dissertation explains structural, optical, electrical and
morphological properties of different concentration sol-gel ZnO seeds and
consanguineous ZnO nanostructured growth dependence on seeds. The effects of
density, thickness, diameter, crystalline quality, annealing time, and annealing
temperature of different concentration sol-gel spin coated ZnO seeds were
investigated for ZNR growth. The spontaneous and detailed study of all the
aforementioned factors were underrated for ZNR growth, which solved many
problems associated with the consanguineous ZNR growth dependence upon seeds.
Also, the electrical characteristics of spin coated seed-based thin films were studied,
which is a hallmark in ZnO thin film-based devices.
The second part of the dissertation explains the detailed growth mechanism of
different ZNSs via MAG and ACG methods. ZNSs were not only fabricated with
MAG, but alternative MAG methods were also propounded to address the problem
of growth stoppage, which is a huge drawback of MAG method. The growth
mechanism and methodological constraints for both MAG and ACG methods were
also compared and contrasted. Furthermore, a detailed physical, structural, optical,
electrical, and electronic analyses were performed for all the fabricated ZNSs via
both methods.
In MAG method, the problem of growth stoppage, which was the biggest issue
associated with MAG method, was addressed for the first time with the proposition
of three alternative MAG methods in a domestic microwave oven. Also, different
ZNSs were fabricated in the span of just a few mins compared to hours in ACG
method. Although, ACG is an old method which has already been researched a lot.
But, we fabricated the highest aspect and surface-to-volume ratio ZNTs. To the best
of our knowledge, the fabricated ZNTs had the smallest diameter achieved until now
via etching. Also, the ZNR dimensions, aspect ratio, and surface to volume ratio were
controlled by controlling the RPM speed of the magnetic stirrer in the ACG method.
In the third part of the dissertation, the effects of doping were studied in detail
on ZnO morphological, crystalline, optical, and electrical characteristics. ZnO was
doped with Ga via both MAG and ACG methods and the methodological accuracy
of both methods were also studied for Ga doping. Previously, it was a challenge to
probe the real effect of Ga doping on Ga-doped ZnO nanorods (GZRs) optoelectronic
characteristics because of doping-induced change in morphology. Hence, NH4OH
treatment was proposed for the first time to provide an optimum morphological
trade-off to GZRs so that the real essence of the change in Ga-doped n-ZnO/p-Si
heterostructure optoelectronic characteristics be probed because of doping rather
than doping-induced change in morphology.
The last part of the dissertation explains the transient current response for ZNRbased
piezoresistive UV sensor. The ZNRs were fabricated on flexible PET
substrates for optical biopsy. Also, the I-V and transient current responses of the
sensors were tested for UV on-off conditions without and with flexible deformationinduced
strain. The device showed a very quick response time for UV switching
which is good for a UV sensor passive device on flexible PET substrate. The flexible
deformation-induced strain provided further impetus to the special separation effect,
hence improving the transient current characteristics.
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