나노 재료 잉크가 포함 된 노즐 젯 인쇄 솔리드스테이트
저자
발행사항
전주: 전북대학교 일반대학원, 2019
학위논문사항
학위논문(박사)-- 전북대학교 일반대학원 : 화학공학과(화학공학 전공) 2019. 8
발행연도
2019
작성언어
영어
주제어
발행국(도시)
전북특별자치도
기타서명
Nozzle-Jet Printed Solid-state Sensors with Nanomaterial Inks
형태사항
xxiii, 258 p.: 삽화, 표; 26 cm.
일반주기명
전북대학교 논문은 저작권에 의해 보호받습니다.
지도교수: 한윤봉
참고문헌 : p. 41-52, 84-89, 129-132, 161-167, 192-198, 227-238
UCI식별코드
I804:45011-000000050141
소장기관
The goal of my PhD research work is to develop cost-effective and
nanostructured based solution processed inks for patterning high performance
electrodes and sensor devices for flexible and printable electronics. In the
ever-expanding technological trends, printed electronics has proven
remarkable potential to develop new and commercially reliable technologies
that would benefit from its unique features, such as, large scale production,
wide range of large area substrate compatibility, low-cost and conformability.
Through the last few decades, solution-processed printed circuit and sensors
have experienced huge research efforts from scientific world for facile
technological growth and enhanced commercial purposes. Besides, the
technical interest in flexible and printable sensors is necessitated for the
realization of cost-effective, fast prototyping for real analysis and large-scale
production devices. Examples of reported devices are antennas, keyboards,
RFID tags, sensors and displays. The typical chemical and bio-sensors are
made of rigid glass/silicon platforms, however plastic and paper substrates
have appeared as an alternative flexible, lightweight, and disposable platforms for printable electronics. Inkjet printing metallic electrodes and sensors on
flexible substrates have proven futile and bloom in printable and flexible
electronic industry.
In chapter 1, firstly, the general features and importance of metal, metal
oxides and metal doped graphene for printed electronics applications have
been presented. Secondly, the printing techniques especially inkjet/nozzle-jet
methods for device fabrication has been explained. Thirdly, the printable bio
and chemical sensors have been discussed in detail.
In chapter 2, we report a naive synthesis procedure for development of a
durable, particle-free and low-temperature sintering silver organic precursor
(SOP) ink by using low boiling-point mild organic complexing ligands. The
synthesized inks were printed on variable substrates such as glass, PET and PI
by spin-coating and nozzle-jet printing methods. As-printed films were
sintered at low temperatures (<90 °C) to achieve smooth silver films having
excellent adhesion and high conductivity. The SOP spin-coated film on glass
annealed at 60 °C and the nozzle-jet printed film on PET sintered at 75 °C
yielded high conductivities of 1.07×106 S/m and 2.74×106 S/m, respectively,
which are only one-order-of-magnitude lower than bulk silver (~107 S/m).
The silver films connected with light-emitting diodes (LEDs) also showed
excellent adhesion strength through bending and twisting test.
In chapter 3, we report a facile chemical route to develop the robust silver
precursor ink with long stability, which possesses key characteristics of an
optimal ink and provides a practical realization in flexible electronics via
multiple techniques. The obtained transparent silver ink offers an
unambiguously unique and economical approach towards printable electronic devices. The silver electrodes are fabricated by silver ink nozzle-jet printing
and ink-pen writing that demonstrate remarkable conductivities (106-107 S/m)
close to bulk silver (~107 S/m) after annealing at 70-100 °C. The adhesion
and conductivity of printed silver is highly stable in various mechanical
bending. High quality nano-crystalline and pin holes free silver patterns are
observed on flexible PET and PI substrates. The probable mechanism for
formulated silver ink is elucidated. The precursor ink formulation process can
possibly eliminate the need for costlier methods such as gravure printing and
paves the way to industrial manufacturing of prudent electronic devices.
In chapter 4, we present the fabrication of nozzle-jet printed flexible fieldeffect
transistor (FET) glucose biosensor. The silver source-drain electrodes
and ZnO seed layers were printed on flexible substrate by nozzle-jet printer
followed by ZnO nanorods (ZnO NRs) synthesis and glucose oxidase (GOx)
immobilization. The use of nozzle-jet printer resulted in high reproducible
sensing active area, growth of well-defined vertical ZnO NRs for high GOx
loading and enhanced sensing performance in wide glucose detection range.
The stability, anti-interference ability, reproducibility, reusability, and
applicability in human serum samples were also assessed. Overall, biosensor
fabrication using nozzle-jet printer will not only provide large scale
production of highly reproducible electrodes but also reduce the fabrication
cost. Additionally, printed electrodes can be modified accordingly for different
analyte detection.
In chapter 5, we report printing of silver precursor and copper oxide
nanoparticles (CuO NPs) inks by nozzle-jet technique to completely fabricate
non-enzymatic glucose biosensor on flexible polyethylene terephthalate (PET) substrate. This fabrication technique for electrode deposition makes it cheap,
economic, eco-friendly and reliable for real practical experimentation. The
precursor solutions were prepared by facile sol-gel process without involving
any complex experimentation. With electrochemical technique, the fully
printed CuO NPs/Ag/PET working electrode exhibited exclusively nonenzymatic
biosensing property toward glucose. The printed biosensor exhibits
a high sensitivity of 1424.2 μA mM-1cm-2, linear range from 0.1 to 15 mM,
low detection limit (0.3 μM; S/N = 3) and fast response time of ~2s under a
working potential of +0.6 V. The fully printed devices demonstrate excellent
long term stability, high reproducibility, precise selectivity and high accuracy
for blood and real serum sample measurements. Hence, our device fabricating
technique can be regarded as a potential technique for the development of
high performance and low cost bio/chemical sensor devices.
Chapter 6, In this study, facile enzymeless phosphate ion detection is reported
using nozzle-jet printed silver/reduced graphene oxide (Ag/rGO) composite
based field-effect transistor (FET) sensor on flexible and disposable polymer
substrates. The sensor exhibits promising results in low concentration as well
as real-time phosphate ion detection. The sensor shows excellent performance
with a wide linear range of 0.005-6.00 mM, high sensitivity of 62.2 μAcm-
2mM-1 and low detection limit of 0.2 μM. This facile combined technology
readily facilitates for the phosphate ion detection with high performance, long
term stability, excellent reproducibility and good selectivity in the presence of
other interfering anions. The sensor fabrication method and phosphate
detection technique yield a low cost, easy to fabricate on polymer substrates at
large scale, user-friendly sensing devices and less analyte consumption. Besides, the sensor has capability to sense phosphate ion in real water samples
which makes it applicable in environmental monitoring.
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