2013
DOI: 10.1039/c3nr03623e
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Abstract: We report a novel procedure involving polyethylenimine-assisted hydrothermal cutting and subsequent ultrafiltration for fabricating nearly monodisperse graphene quantum dots with a uniform lateral size and confined layer number. The isolated monolayer quantum dots exhibit a sharp band-edge absorption feature and strong photoluminescence (quantum yield of 21%) independent of excitation wavelength and pH. Their preliminary application in bioimaging has been demonstrated.

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Cited by 70 publications
(67 citation statements)
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“…All these superior optical characteristics and high PL yield (45%) are well correlated with the high-quality features of the GQDs such as almost defect-free single-crystalline structure and ideal electrondonating functionalization at edge sites rather than at basal plane sites. In marked contrast, previously reported GQDs usually exhibit poor optical properties 2,8,9,11,13,16,[18][19][20][21] , which are related to their highly defective structures with a great number of sp 3 and vacancy defect states in the basal plane 17,24 . The photostability of the GQDs was tested under 3-h continuous radiation using a 100 W xenon lamp.…”
Section: Resultsmentioning
confidence: 41%
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“…All these superior optical characteristics and high PL yield (45%) are well correlated with the high-quality features of the GQDs such as almost defect-free single-crystalline structure and ideal electrondonating functionalization at edge sites rather than at basal plane sites. In marked contrast, previously reported GQDs usually exhibit poor optical properties 2,8,9,11,13,16,[18][19][20][21] , which are related to their highly defective structures with a great number of sp 3 and vacancy defect states in the basal plane 17,24 . The photostability of the GQDs was tested under 3-h continuous radiation using a 100 W xenon lamp.…”
Section: Resultsmentioning
confidence: 41%
“…In most cases, however, such cutting is less effective, and thus GQDs can only be produced in small amounts. Moreover, GQDs produced by cutting methods typically exhibit extremely poor optical properties 2,8,9,11,13,16,[18][19][20][21] . For example, their absorption bands are merely within the UV region, even though their sizes increase from a few 2,8,11,13,16,[18][19][20][21] to dozens 9 of nanometres.…”
mentioning
confidence: 99%
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“…58 Xue, et al introduced polyethylenimine into the hydrothermal cutting of GOs, coupled with ultrafiltration to isolate the targeted GQDs exhibiting enhanced photoluminescence emissions. 59 Tetsuka, et al…”
Section: Other Carbon-based Qdsmentioning
confidence: 98%
“…GQDs are usually appeared as products of cutting processes of large graphene nanosheets with a diameter that range between 1 and 20 nm and characteristic photoluminescence properties. [26][27][28][29][30] The motivation of this procedure was to cover the gap between few hours sonication methods that produce diluted dispersion of single layer graphene mixed with few layer graphene and extremely long sonication procedures of 150 or 460 hours that produce similar products with increased dispersibility, in liquid exfoliation of graphite. 14,15 The present procedure includes an overnight sonication of natural graphite in DMF, combined with a purification-isolation step of ultracentrifugation.…”
mentioning
confidence: 99%