Gas sensing properties of poly-3-hexylthiophene thin film transistors

Fukuda, Hisashi; Yamagishi, Yasuaki; Ise, Masafumi; Takano, Nobuhiro

doi:10.1016/j.snb.2004.10.045

Cited by 26 publications

(9 citation statements)

References 16 publications

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“…In addition to typical radial breathing modes (RBMs) of SWCNTs on the low-energy side at frequencies less than 350 cm -1 and the G-band near 1590 cm -1 from SWCNTs, two bands near 1337 and 1443 cm -1 were visible in Figure 3b and d, which originated from 3-hexylthiophene. [33] It is also noted that both the RBMs and the G-band for H 12,RR composites were upshifted, independent of the excitation energies, compared to values for the pristine SWCNT sample. This shift can be attributed to charge-transfer from SWCNTs to the dispersant because of the presence of electronegative sulfur atoms.…”

Section: Full Papermentioning

confidence: 87%

Design of Dispersants for the Dispersion of Carbon Nanotubes in an Organic Solvent

Kim

Yoon

Choi

et al. 2007

Adv Funct Materials

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The effect of dispersant structures for dispersing single‐walled carbon nanotubes (SWCNTs) is investigated. The monomer 3‐hexylthiophene is used as the starting material for the development of a series of oligomers that are used to disperse SWCNTs in an organic solvent. The series is obtained by varying the number of head groups, the regioregularity of head groups, and the head‐to‐tail ratios of the hexyl group in the oligomers. The SWCNT solutions are characterized with UV‐vis–near‐IR spectroscopy and transmission electron microscopy. An increase in the number of head groups improves the dispersity of SWCNTs, and a regioregular oligomer plays an important role in dispersing SWCNTs. Furthermore, Raman spectroscopy and X‐ray photoelectron spectroscopy shows that the sulfur atom head groups enhance interactions between the thiophenes and the SWCNT walls. The analysis demonstrated that a well‐designed thiophene oligomer could afford well‐dispersed SWCNT solutions with long‐term dispersion stability, even with an extremely low dispersant concentration (weight ratio of CNTs/dispersant is one and the dispersant concentration is 0.1 g L–1).

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Section: Full Papermentioning

confidence: 87%

Design of Dispersants for the Dispersion of Carbon Nanotubes in an Organic Solvent

Kim

Yoon

Choi

et al. 2007

Adv Funct Materials

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“…The response behavior of OTFT sensor is strongly dependent on the active thin film properties such as morphology, doping level, surface trap density and grain boundaries, and so on. So far, most reports on OTFT-based gas sensors were based on the single sensitive materials such as small organic molecules [ 15 , 16 ] or conducting polymer [ 17 , 18 ]. Several approaches were demonstrated to improve the sensing performance of OTFT sensors by changing the grain structure of organic layer [ 19 ] or functional groups [ 20 ], or preparing bilayer sensing thin film [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

Tai

Jiang

et al. 2015

Sensors

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A thin-film transistor (TFT) having an organic–inorganic hybrid thin film combines the advantage of TFT sensors and the enhanced sensing performance of hybrid materials. In this work, poly(3-hexylthiophene) (P3HT)-zinc oxide (ZnO) nanoparticles' hybrid thin film was fabricated by a spraying process as the active layer of TFT for the employment of a room temperature operated formaldehyde (HCHO) gas sensor. The effects of ZnO nanoparticles on morphological and compositional features, electronic and HCHO-sensing properties of P3HT-ZnO thin film were systematically investigated. The results showed that P3HT-ZnO hybrid thin film sensor exhibited considerable improvement of sensing response (more than two times) and reversibility compared to the pristine P3HT film sensor. An accumulation p-n heterojunction mechanism model was developed to understand the mechanism of enhanced sensing properties by incorporation of ZnO nanoparticles. X-ray photoelectron spectroscope (XPS) and atomic force microscopy (AFM) characterizations were used to investigate the stability of the sensor in-depth, which reveals the performance deterioration was due to the changes of element composition and the chemical state of hybrid thin film surface induced by light and oxygen. Our study demonstrated that P3HT-ZnO hybrid thin film TFT sensor is beneficial in the advancement of novel room temperature HCHO sensing technology.

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“…Organic thin film transistors ͑OTFTs͒ have a broad range of applications, including flexible displays, sensors, wearable electronics, smart packages, memories, radio frequency identification tags, 1 etc. It has been recognized that thin film transistors offer a great deal of promise for applications in various types of sensors, including light sensor, 2,3 pressure sensor, 4 gas sensor, 5 and chemical, biological, and medical sensors. [6][7][8][9] Miniaturization is demanded for all types of sensors because of the need for better portability, higher sensitivity, lower power dissipation, and better device integration.…”

Section: Introductionmentioning

confidence: 99%

Highly photosensitive thin film transistors based on a composite of poly(3-hexylthiophene) and titania nanoparticles

Yan

Mok

2009

Journal of Applied Physics

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Organic phototransistors based on a composite of P3HT and TiO 2 nanoparticles have been fabricated, which show high photosensitivity, fast response, and stable performance under both visible and ultraviolet light illumination, and thus they are promising for applications as low cost photosensors. The transfer characteristic of each device exhibits a parallel shift to a positive gate voltage under light illumination, and the channel current increases up to three orders of magnitude in the subthreshold region. The shift in the threshold voltage of the device has a nonlinear relationship with light intensity, which can be attributed to the accumulation of electrons in the embedded TiO 2 nanoparticles. It has been found that the device is extremely sensitive to weak light due to an integration effect. The relationship between the threshold voltage change and the intensity of light illumination can be fitted with a power law. An analytical model has been developed to describe the photosensitive behavior of the devices. It is expected that such organic phototransistors can be developed for sensing different wavelengths based on different semiconducting polymers and semiconducting nanoparticles.

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Gas sensing properties of poly-3-hexylthiophene thin film transistors

Cited by 26 publications

References 16 publications

Design of Dispersants for the Dispersion of Carbon Nanotubes in an Organic Solvent

Design of Dispersants for the Dispersion of Carbon Nanotubes in an Organic Solvent

The Enhanced Formaldehyde-Sensing Properties of P3HT-ZnO Hybrid Thin Film OTFT Sensor and Further Insight into Its Stability

Highly photosensitive thin film transistors based on a composite of poly(3-hexylthiophene) and titania nanoparticles

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