Solution‐Processed Nanoporous Organic Semiconductor Thin Films: Toward Health and Environmental Monitoring of Volatile Markers

Zhang, Fengjiao; Qu, Ge; Mohammadi, Erfan; Mei, Jianguo; Diao, Ying

doi:10.1002/adfm.201701117

Cited by 138 publications

(154 citation statements)

References 58 publications

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“…[27] Highly sensitive OFET based sensors could be utilized as a fast, inexpensive and noninvasive alternative for early diagnosis of the disease through detection of breath ammonia at extremely low concentration. [28] As the gaseous analyte approaches and diffuses into the OSC film, we expect a first-order charge-transfer reaction to occur between DPP2T-TT and ammonia as follows, where the electron transferred from ammonia reduces the hole concentration in the channel and thereby decreases the current [29]…”

Section: Thickness Dependent Sensitivity To Gaseous Biomarkermentioning

confidence: 99%

Printing 2D Conjugated Polymer Monolayers and Their Distinct Electronic Properties

Kafle

Zhang

Schorr

et al. 2020

Adv Funct Materials

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Recently, 2D monolayer films of conjugated polymers have gained increasing attention owing to the preeminence of 2D inorganic films that exhibit unique optoelectronic and mechanical properties compared to their bulk analogs. Despite numerous efforts, crystallization of semiconducting polymers into highly ordered 2D monolayer films still remains challenging. Herein, a dynamic‐template‐assisted meniscus‐guided coating is utilized to fabricate continuous, highly ordered 2D monolayer films of conjugated polymers over a centimeter scale with enhanced backbone π–π stacking. In contrast, monolayer films printed on solid substrates confer upon the 1D fiber networks strong alkyl side‐chain stacking at the expense of backbone packing. From single‐layers to multilayers, the polymer π‐stacks change from edge‐on to bimodal orientation as the film thickness reaches ≈20 nm. Spectroscopic and cyclic voltammetry analysis reveals an abrupt increase in J‐aggregation and absorption coefficient and a decrease in bandgap and highest occupied molecular orbital level until critical thickness, possibly arising from the straightened polymer backbone. This is corroborated by an abrupt increase in hole mobility with film thickness, reaching a maximum of 0.7 cm2 V−1 s−1 near the critical thickness. Finally, fabrication of chemical sensors incorporating polymer films of various thicknesses is demonstrated, and an ultrahigh sensitivity of the ≈7 nm thick ultrathin film (bilayers) to 1 ppb ammonia is shown.

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Section: Thickness Dependent Sensitivity To Gaseous Biomarkermentioning

confidence: 99%

Printing 2D Conjugated Polymer Monolayers and Their Distinct Electronic Properties

Kafle

Zhang

Schorr

et al. 2020

Adv Funct Materials

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“…C 8 ‐BTBT thin films were coated on highly doped silicon wafers with a 300 nm thick layer of thermally grown SiO 2 by a meniscus‐guided coating method reported in our previous works . Substrates were rinsed with isopropanol, acetone, and toluene and blow‐drying with compressed nitrogen gas before coating.…”

Section: Methodsmentioning

confidence: 99%

Quantitative Image Analysis of Fractal‐Like Thin Films of Organic Semiconductors

Zhu

Mohammadi

Diao

2019

J Polym Sci B Polym Phys

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Morphology modulation offers significant control over organic electronic device performance. However, morphology quantification has been rarely carried out via image analysis. In this work, we designed a MATLAB program to evaluate two key parameters describing morphology of small molecule semiconductor thin films: fractal dimension and film coverage. We then use this program in a case study of meniscus‐guided coating of 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene (C8‐BTBT) under various conditions to analyze a diverse and complex morphology set. The evolution of morphology in terms of fractal dimension and film coverage was studied as a function of coating speed. We discovered that combined fractal dimension and film coverage can quantitatively capture the key characteristics of C8‐BTBT thin film morphology; change of these two parameters further inform morphology transition. Furthermore, fractal dimension could potentially shed light on thin film growth mechanisms. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 1622–1634

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“…The detection performance is further influenced by the non‐controllability of the pores. In this sense, Diao and co‐workers demonstrated solution‐processed tunable nanoporous OSC thin films where the pore sizes can be tuned in the insulating layer template . As depicted in Figure a, meniscus‐guided unidirectional coating (left, top) and spin‐coating (left, bottom) are used, which are suitable for large‐scale preparation.…”

Section: Osc Films With 3d Porous Structurementioning

confidence: 99%

Gas Sensors Based on Nano/Microstructured Organic Field‐Effect Transistors

Zhang

Zhao

et al. 2019

Small

107

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Benefiting from the advantages of organic field‐effect transistors (OFETs), including synthetic versatility of organic molecular design and environmental sensitivity, gas sensors based on OFETs have drawn much attention in recent years. Potential applications focus on the detection of specific gas species such as explosive, toxic gases, or volatile organic compounds (VOCs) that play vital roles in environmental monitoring, industrial manufacturing, smart health care, food security, and national defense. To achieve high sensitivity, selectivity, and ambient stability with rapid response and recovery speed, the regulation and adjustment of the nano/microstructure of the organic semiconductor (OSC) layer has proven to be an effective strategy. Here, the progress of OFET gas sensors with nano/microstructure is selectively presented. Devices based on OSC films one dimensional (1D) single crystal nanowires, nanorods, and nanofibers are introduced. Then, devices based on two dimensional (2D) and ultrathin OSC films, fabricated by methods such as thermal evaporation, dip‐coating, spin‐coating, and solution‐shearing methods are presented, followed by an introduction of porous OFET sensors. Additionally, the applications of nanostructured receptors in OFET sensors are given. Finally, an outlook in view of the current research state is presented and eight further challenges for gas sensors based on OFETs are suggested.

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Solution‐Processed Nanoporous Organic Semiconductor Thin Films: Toward Health and Environmental Monitoring of Volatile Markers

Cited by 138 publications

References 58 publications

Printing 2D Conjugated Polymer Monolayers and Their Distinct Electronic Properties

Printing 2D Conjugated Polymer Monolayers and Their Distinct Electronic Properties

Quantitative Image Analysis of Fractal‐Like Thin Films of Organic Semiconductors

Gas Sensors Based on Nano/Microstructured Organic Field‐Effect Transistors

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