Ultrathin organic transistors for chemical sensing

Magnetic metallo-organic thin films have been prepared at different growth temperatures to characterize the influence of structural properties on the magnetic characteristics. A quantitative analysis of the grain size shows that the growth temperature increases the elliptical grain size considerably. Long grains of planar iron phthalocyanine form quasi one-dimensional iron chains, which are embedded in a carbon matrix along the other two dimensions. The chains are narrowly spaced (1.3 nm) and run parallel to the substrate. Temperature-dependent magnetization curves depend on the structural details of the iron chains. These magnetic properties are tuned with deposition parameters.

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“…Metallo-organic thin films of FePc were deposited onto carefully cleaned sapphire substrates [7,8]. FePc was purchased from Sigma-Aldrich.…”

Section: Methodsmentioning

confidence: 99%

Control of magnetic properties in metallo-organic thin films

et al. 2010

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“…7 Phthalocyanines are planar organic molecules with diverse properties, fundamental to both science and technology. Applications of phthalocyanines include organic field effect transistors, gas sensors, 8 and solar cells. 9 Several metallo-phthalocyanine based powders and thin films exhibit low-dimensional magnetism.…”

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confidence: 99%

Substrate-controlled ferromagnetism in iron phthalocyanine films due to one-dimensional iron chains

et al. 2012

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Using magneto-optical Kerr effect, SQUID magnetometry and magnetic circular dichroism spectroscopy, ferromagnetism was found below 4.5K in iron phthalocyanine thin films grown by molecular beam epitaxy. The stacking of the molecules can be controlled via deposition temperature and substrate choice. The molecules self-assemble such that quasi one-dimensional iron chains form. The chains are limited in length by the grain size or film thickness which is manipulated using judicious growth methods. Magnetic hysteresis loops show distinct features in the saturation magnetization and susceptibility that depend on the thin film structure and/or substrate. We find two regimes for the magnetic behavior: below temperatures of ∼ 25K, intra-chain interactions couple the Fe ions and produce non-traditional paramagnetic behavior, while at low temperatures below ∼ 4.5K interactions between the one-dimensional chains produce hysteresis, magnetic order, and slow magnetization dynamics.

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“…[4] However, sufficient thickness to maintain useful current output must be maintained. Thus, it is important to find the minimum thickness to form the conduction channel of a working OFET in order to optimize response speed, sensitivity, and signal strength.…”

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Monolayer‐Dimensional 5,5′‐Bis(4‐hexylphenyl)‐2,2′‐bithiophene Transistors and Chemically Responsive Heterostructures

2008

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The organic semiconductor 5,5′‐Bis(4‐ hexylphenyl)‐2,2′‐bithiophene (6PTTP6) shows a remarkable 2D growth mechanism. Without requiring a complicated fabrication process, organic field‐effect transistors (OFETs) with only a 1.5 monolayer 6PTTP6 film show mobilities close to those of conventional thick OFETs. Our heterostructured OFET blend exhibits a much faster response speed and a higher sensitivity to nerve‐agent simulants than thicker OFET analogues.

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Ultrathin organic transistors for chemical sensing

Cited by 99 publications

References 19 publications

Control of magnetic properties in metallo-organic thin films

Control of magnetic properties in metallo-organic thin films

Substrate-controlled ferromagnetism in iron phthalocyanine films due to one-dimensional iron chains

Monolayer‐Dimensional 5,5′‐Bis(4‐hexylphenyl)‐2,2′‐bithiophene Transistors and Chemically Responsive Heterostructures

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