Freestanding Organic Charge-Transfer Conformal Electronics

Zhang, Zhuolei; Li, Huashan; Miller, R.; Malissa, H.; Jamali, S.H.; Boehme, Christoph; Grossman, Jeffrey C.; Ren, Shenqiang

doi:10.1021/acs.nanolett.8b01342

Cited by 11 publications

(6 citation statements)

References 60 publications

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“…Figure d shows the pressure‐dependent current change ranging from 0 to 2000 Pa, where the inset is the repeatable ON/OFF current change with fast strain/pressure response (<0.1 ms) by expanding or releasing the pressure in the tube. The high sensitivity, fast response time, and conformal adjustability characteristics of flexible MEH‐PPV nanosheets are promising for the strain/pressure sensing application …”

Section: Resultsmentioning

confidence: 99%

“…The high sensitivity, fast response time, and conformal adjustability characteristics of flexible MEH-PPV nanosheets are promising for the strain/pressure sensing application. [36] The light-emitting nature of MEH-PPV facilitates its wireless non-contact strain sensing due to the emission change under strain. The changes in optical properties under strain, such as fluorescence, are particularly advantageous because of the high sensitivity of fluorescence detection.…”

Section: R R Xmentioning

confidence: 99%

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Kirigami‐Inspired Stretchable Conjugated Electronics

Zhang

Tang

et al. 2019

Adv Elect Materials

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The conducting nature of π-conjugated polymers enables the strain-dependent electronic and capacitance sensor. Its light-emitting nature facilitates its optical strain sensing due to the emission change under strain, which is unaccessible in the conductor and insulator materials. The semiconducting materials used to form stretchable components are typically achieved by transferring the films onto the soft stretchable substrate. Random polymer chain distribution with defects would exist, and a significant amount of cracks could occur during the transferring process. The geometric engineering has been applied to simultaneously achieve high stretchability and conductivity of conjugated polymers. [20-22] In this context, the kirigami, which refers to cutting materials into certain patterns to acquire desirable structures, has inspired the programmable stretchable electronics. [23,24] The kirigami structures reveal excellent potential to achieve the desired stretchable electronic properties. Here, we report a liquid/air assembly to grow large-area freestanding poly2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene (MEH-PPV) nanosheets, while their unique electronic and light-emitting properties arise from the electron coupling strength between π-stacking units and further high degree of molecular packing arrangements. The freestanding MEH-PPV nanosheets at the water-air interface ensure the conformal contact onto various surfaces. These contribute to the development of conformal sensors based on the sensitivity of band gap to π-π stacking. Furthermore, the geometric engineering with kirigami structures on the freestanding MEH-PPV films not only extends its stretchability but also sustains its conductive and light-emitting properties, which significantly enhance its stretchable applications.

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Section: Resultsmentioning

confidence: 99%

Section: R R Xmentioning

confidence: 99%

Kirigami‐Inspired Stretchable Conjugated Electronics

Zhang

Tang

et al. 2019

Adv Elect Materials

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“…When S is positive, the oil will spread over water, while for a negative S , oil will not spread on the water as it is not energetically favorable. For chloroform–water and toluene–water, S > 0 (see Supporting Information Note 2 for calculation), while for ODCB–water, S is negative, , inhibiting controllable nanotube deposition from the TaFISA process.…”

Section: Resultsmentioning

confidence: 99%

Parameters Affecting Interfacial Assembly and Alignment of Nanotubes

Jinkins,

Dwyer,

Suresh

et al. 2023

Langmuir

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Tangential flow interfacial self-assembly (TaFISA) is a promising scalable technique enabling uniformly aligned carbon nanotubes for high-performance semiconductor electronics. In this process, flow is utilized to induce global alignment in two-dimensional nematic carbon nanotube assemblies trapped at a liquid/liquid interface, and these assemblies are subsequently deposited on target substrates. Here, we present an observational study of experimental parameters that affect the interfacial assembly and subsequent aligned nanotube deposition. We specifically study the water contact angle (WCA) of the substrate, nanotube ink composition, and water subphase and examine their effects on liquid crystal defects, overall and local alignment, and nanotube bunching or crowding. By varying the substrate chemical functionalization, we determine that highly aligned, densely packed, individualized nanotubes deposit only at relatively small WCA between 35 and 65°. At WCA (< 10°), high nanotube bunching or crowding occurs, and the film is nonuniform, while aligned deposition ceases to occur at higher WCA (>65°). We find that the best alignment, with minimal liquid crystal defects, occurs when the polymer-wrapped nanotubes are dispersed in chloroform at a low (0.6:1) wrapper polymer to nanotube ratio. We also demonstrate that modifying the water subphase through the addition of glycerol not only improves overall alignment and reduces liquid crystal defects but also increases local nanotube bunching. These observations provide important guidance for the implementation of TaFISA and its use toward creating technologies based on aligned semiconducting carbon nanotubes.

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“…The utilization of conformal nanostructures formed on microarchitectures is of great significance for diverse applications, such as wetting tunability [ 1 , 2 ], flexible electronics [ 3 , 4 ], photodetectors [ 5 ], biomimetic photonics [ 6 ] and green energy [ 7 ]. Although micro/nanostructure fabrication via broad-range techniques of photolithography [ 8 ], laser etching [ 9 ], three-dimensional (3D) printing [ 10 ], thermal oxidation [ 11 ] and chemical deposition [ 12 ] has been highly developed, a method for validly constructing conformal nanostructures on complex microarchitectures remains elusive, especially for large-area fabrication of periodic nanostructures on convex and concave surfaces.…”

Section: Introductionmentioning

confidence: 99%

Conformal Self-Assembly of Nanospheres for Light-Enhanced Airtightness Monitoring and Room-Temperature Gas Sensing

et al. 2021

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The fabrication of conformal nanostructures on microarchitectures is of great significance for diverse applications. Here a facile and universal method was developed for conformal self-assembly of nanospheres on various substrates including convex bumps and concave holes. Hydrophobic microarchitectures could be transferred into superhydrophilic ones using plasma treatment due to the formation of numerous hydroxyl groups. Because of superhydrophilicity, the nanosphere suspension spread on the microarchitectures quickly and conformal self-assembly of nanospheres can be realized. Besides, the feature size of the conformal nanospheres on the substrates could be further regulated by plasma treatment. After transferring two-dimensional tungsten disulfide sheets onto the conformal nanospheres, the periodic nanosphere array was demonstrated to be able to enhance the light harvesting of WS2. Based on this, a light-enhanced room-temperature gas sensor with a fast recovery speed (<35 s) and low detecting limit (500 ppb) was achieved. Moreover, the WS2-covered nanospheres on the microarchitectures were very sensitive to the changes in air pressure due to the formation of suspended sheets on the convex bumps and concave holes. A sensitive photoelectronic pressure sensor that was capable of detecting the airtightness of vacuum devices was developed using the WS2-decorated hierarchical architectures. This work provides a simple method for the fabrication of conformal nanospheres on arbitrary substrates, which is promising for three-dimensional microfabrication of multifunctional hierarchical microarchitectures for diverse applications, such as biomimetic compound eyes, smart wetting surfaces and photonic crystals.

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Freestanding Organic Charge-Transfer Conformal Electronics

Cited by 11 publications

References 60 publications

Kirigami‐Inspired Stretchable Conjugated Electronics

Kirigami‐Inspired Stretchable Conjugated Electronics

Parameters Affecting Interfacial Assembly and Alignment of Nanotubes

Conformal Self-Assembly of Nanospheres for Light-Enhanced Airtightness Monitoring and Room-Temperature Gas Sensing

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