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Micropatterning of MXene-Based Electrolyte-Gated Field-Effect Transistor for Organophosphate Pesticides Detection
Micropatterning of MXene-Based Electrolyte-Gated Field-Effect Transistor for Organophosphate Pesticides Detection
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105645
- ISBN
- 9798270246280
- DDC
- 620.5
- 저자명
- Yin, Yaoqi.
- 서명/저자
- Micropatterning of MXene-Based Electrolyte-Gated Field-Effect Transistor for Organophosphate Pesticides Detection
- 발행사항
- [Sl] : The University of Wisconsin - Madison, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 124 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
- 주기사항
- Advisor: Gunasekaran, Sundaram.
- 학위논문주기
- Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
- 초록/해제
- 요약Miniaturized and integrated microsystems have become central to emerging technologies, such as implantable electronics, soft robotics, wearable sensors, and dense IoT networks. These applications demand micro-/nano-scale conductors that can be patterned with high precision, throughput, and material fidelity on a variety of substrates. Although techniques such as inkjet printing, 3D printing, and patterned coating have facilitated microsystem integration, there remains a pressing need for low-cost and scalable nanofabrication strategies.In this dissertation, a capillarity-assisted, solution-based micropatterning strategy is described to fabricate electrically continuous MXene micro-/nano-scale architectures on both rigid and flexible platforms. Microfluidic stamps were produced by negative UV photolithography and used to confine MXene dispersions through controlled capillary flow. Initial trials revealed challenges in achieving high-fidelity patterns due to limited solution-substrate interaction. To enhance solution-substrate interactions, glass and PET surfaces were oxygen plasma-treated to introduce hydroxyl functionalities, followed by APTES silanization, which imparted surface amine groups, improving wettability and electrostatic adhesion with negatively charged MXene flakes. Additionally, MXene flake size distributions were refined through liquid cascade centrifugation, while microchannel dimensions were optimized to minimize flake aggregation and ensure uniform pattern transfer. The resulting process enabled the formation of continuous MXene nanopatterns with controllable thickness through layer-by-layer deposition. To demonstrate its practical utility, a solution-gated MXene/TiO₂ field-effect transistor (FET) was fabricated for selective detection of malathion, a widely used organophosphorus pesticide (OP). Given that OPs are extensively used in agriculture and persist in water, soil, and food chains, developing sensitive monitoring systems is vital to mitigate associated health hazards. The fabricated FETs detect malathion through their interaction with the MXene/TiO₂ surface, utilizing the charge-sensitive properties of MXene. The TiO₂ nanoparticles and malathion binding event generates an electrical signal. In situ oxidation of Ti₃C₂ MXene generated TiO₂ nanoparticles, forming semiconductor-metal heterojunctions that enhance charge transport and signal amplification. The limit of detection (LOD) and linear range of the FETs were 0.025 ppm and 0.025 to 10 ppm, respectively, which enables reliable, label-free sensing of malathion in aqueous media. Beyond malathion sensing, this patterning methodology offers a universal route for organizing diverse 2D materials-such as MoS₂, graphene, and WS₂-into functional electronic and sensing architectures. Overall, this work establishes a scalable MXene micropatterning platform that integrates materials engineering with microfabrication principles to enable cost-effective, flexible, and high-resolution electronics for environmental monitoring applications.
- 일반주제명
- Nanotechnology
- 일반주제명
- Agricultural engineering
- 일반주제명
- Materials science
- 키워드
- 2D nanomaterials
- 키워드
- Micropattering
- 키워드
- MXene
- 기타저자
- The University of Wisconsin - Madison Biological Systems Engineering
- 기본자료저록
- Dissertations Abstracts International. 87-06B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105645
■006m o d
■007cr#unu||||||||
■020 ▼a9798270246280
■035 ▼a(MiAaPQ)AAI32399994
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a620.5
■1001 ▼aYin, Yaoqi.
■24510▼aMicropatterning of MXene-Based Electrolyte-Gated Field-Effect Transistor for Organophosphate Pesticides Detection
■260 ▼a[Sl]▼bThe University of Wisconsin - Madison▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a124 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-06, Section: B.
■500 ▼aAdvisor: Gunasekaran, Sundaram.
■5021 ▼aThesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
■520 ▼aMiniaturized and integrated microsystems have become central to emerging technologies, such as implantable electronics, soft robotics, wearable sensors, and dense IoT networks. These applications demand micro-/nano-scale conductors that can be patterned with high precision, throughput, and material fidelity on a variety of substrates. Although techniques such as inkjet printing, 3D printing, and patterned coating have facilitated microsystem integration, there remains a pressing need for low-cost and scalable nanofabrication strategies.In this dissertation, a capillarity-assisted, solution-based micropatterning strategy is described to fabricate electrically continuous MXene micro-/nano-scale architectures on both rigid and flexible platforms. Microfluidic stamps were produced by negative UV photolithography and used to confine MXene dispersions through controlled capillary flow. Initial trials revealed challenges in achieving high-fidelity patterns due to limited solution-substrate interaction. To enhance solution-substrate interactions, glass and PET surfaces were oxygen plasma-treated to introduce hydroxyl functionalities, followed by APTES silanization, which imparted surface amine groups, improving wettability and electrostatic adhesion with negatively charged MXene flakes. Additionally, MXene flake size distributions were refined through liquid cascade centrifugation, while microchannel dimensions were optimized to minimize flake aggregation and ensure uniform pattern transfer. The resulting process enabled the formation of continuous MXene nanopatterns with controllable thickness through layer-by-layer deposition. To demonstrate its practical utility, a solution-gated MXene/TiO₂ field-effect transistor (FET) was fabricated for selective detection of malathion, a widely used organophosphorus pesticide (OP). Given that OPs are extensively used in agriculture and persist in water, soil, and food chains, developing sensitive monitoring systems is vital to mitigate associated health hazards. The fabricated FETs detect malathion through their interaction with the MXene/TiO₂ surface, utilizing the charge-sensitive properties of MXene. The TiO₂ nanoparticles and malathion binding event generates an electrical signal. In situ oxidation of Ti₃C₂ MXene generated TiO₂ nanoparticles, forming semiconductor-metal heterojunctions that enhance charge transport and signal amplification. The limit of detection (LOD) and linear range of the FETs were 0.025 ppm and 0.025 to 10 ppm, respectively, which enables reliable, label-free sensing of malathion in aqueous media. Beyond malathion sensing, this patterning methodology offers a universal route for organizing diverse 2D materials-such as MoS₂, graphene, and WS₂-into functional electronic and sensing architectures. Overall, this work establishes a scalable MXene micropatterning platform that integrates materials engineering with microfabrication principles to enable cost-effective, flexible, and high-resolution electronics for environmental monitoring applications.
■590 ▼aSchool code: 0262.
■650 4▼aNanotechnology
■650 4▼aAgricultural engineering
■650 4▼aMaterials science
■653 ▼a2D nanomaterials
■653 ▼aField-effect transistor
■653 ▼aMicropattering
■653 ▼aMXene
■653 ▼aOrganophosphate pesticides
■690 ▼a0652
■690 ▼a0539
■690 ▼a0794
■71020▼aThe University of Wisconsin - Madison▼bBiological Systems Engineering.
■7730 ▼tDissertations Abstracts International▼g87-06B.
■790 ▼a0262
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360964▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


