Showing papers by "Jian Zheng published in 2010"
TL;DR: In this article, a linear asymmetric oligoarene 6-methy)-anthra[2,3-b]benzo[d]thiophene (Me-ABT) is synthesized and its high-quality microribbons are grown by a solution process.
Abstract: Oligoarenes as an alternative group of promising semiconductors in organic optoelectronics have attracted much attention. However, high-performance and low-cost opto-electrical devices based on linear asymmetric oligoarenes with nano/microstructures are still rarely studied because of difficulties both in synthesis and high-quality nano/microstructure growth. Here, a novel linear asymmetric oligoarene 6-methy)-anthra[2,3-b]benzo[d]thiophene (Me-ABT) is synthesized and its high-quality microribbons are grown by a solution process. The solution of Me-ABT exhibits a moderate fluorescence quantum yield of 0.34, while the microribbons show a glaucous light emission. Phototransistors based on an individual Me-ABT microribbon prepared by a solution-phase self-assembly process showed a high mobility of 1.66 cm 2 V ―1 s ―1 , a large photoresponsivity of 12 000 A W ―1 , and a photocurrent/dark- current ratio of 6000 even under low light power conditions (30 μW cm ―2 ). The measured photoresponsivity of the devices is much higher than that of inorganic single-crystal silicon thin film transistors. These studies should boost the development of the organic semiconductors with high-quality microstructures for potential application in organic optoelectronics.
121 citations
TL;DR: A general route was demonstrated to realize the patterning of reduced graphene oxide sheets (RGOs) on a variety of substrates by a combination of modulating the solution wettability of the substrates and spin-coating process.
Abstract: A general route was demonstrated to realize the patterning of reduced graphene oxide sheets (RGOs) on a variety of substrates by a combination of modulating the solution wettability of the substrates and spin-coating process. By virtue of usual surface treatment technique or application of mixed solvent, the GO solution wettability can be controlled precisely. The wettability modulation combined with spin-coating and reducing process brings on patterning of RGOs. This simple but effective, general, and low-cost approach holds great promise for numerous potential applications in organic electronics, flexible transparent conducting thin films, and flexible semi-transparent sensors.
61 citations
TL;DR: Large-flake graphene membranes up to 300 microm(2) can be exfoliated from graphite by oleyl amine based on solvothermal conditions and are of high quality and have few defects.
60 citations
TL;DR: A fused-seven-ring anthracene derivative with two sulfur bridges, benzobisthioxanthene (BTA), was synthesized, facilely, and OLEDs employing BTA as the emitter exhibited bright and efficient red emission.
36 citations
Patent•
23 Jun 2010
TL;DR: In this paper, a method for preparing grapheme through organic amine solvothermal method, which comprises the following steps: 1) adopting the solv-thermal method to lead expanded graphite to react with organic amines or organic amina solvent to obtain the semi-discrete liquid of graphheme; 2) implementing ultrasonic dispersion and then implementing centrifugation on the semi discrete liquid obtained from the step 1), and then collecting supernate, thus obtaining the graphetme.
Abstract: The invention discloses a method for preparing grapheme through organic amine solvothermal method, which comprises the following steps: 1) adopting the solvothermal method to lead expanded graphite to react with organic amine or organic amine solvent to obtain the semi-discrete liquid of grapheme; 2) implementing ultrasonic dispersion and then implementing centrifugation on the semi-discrete liquid of grapheme obtained from the step 1), and then collecting supernate, thus obtaining the grapheme. The invention obtains the grapheme by taking solvent thermal spalling as a means. A scanning electron microscope, a transmission electron microscope, and an atomic force microscope are adopted to represent the topogram of the grapheme; a Raman spectrum and an X-ray photoelectron spectroscopy are used to represent the density of imperfection and oxidation situation of the grapheme. The result shows that the grapheme synthesized by the method of the invention has the advantages of small size, high quality, less defects, light oxidation degree, etc. besides, the method for preparing grapheme through organic amine solvothermal method also has the advantages of simple synthetic route, low cost, high concentration and uneasy accumulation of the synthesized discrete liquid of grapheme, and excellent application prospect on the aspect of discrete liquid of grapheme materials.
15 citations
Patent•
22 Dec 2010
TL;DR: In this paper, a halogenated graphite and a graphite with elemental halogen under the microwave radiation and obtaining the halogened graphite was presented, which can be used for producing a great deal of halogen-graphite with high yield.
Abstract: The invention discloses a halogenated graphite and a halogenated graphene, and preparation methods thereof. The preparation method of the halogenated graphite comprises reacting expanded graphite with elemental halogen under the microwave radiation and obtaining the halogenated graphite. The preparation method of the halogenated graphene comprises obtaining the halogenated graphite according to the above-mentioned method, dispersing and centrifuging the halogenated graphite, collecting supernatant, carrying out treatment and obtaining the halogenated graphene. The halogenated graphene has the elemental halogen with the mass percent of 0.5-4.0%. The preparation methods of the invention can be used for producing a great deal of halogenated graphite and halogenated graphene with high yield. In addition, the invention also has the advantages of simple synthetic route, low synthesis cost (the raw materials are commercialized low-price products, short reaction time and the like.
4 citations