Effective light scattering and charge separation in nanodiamond@g-C3N4 for enhanced visible-light hydrogen evolution

Su, Lixia; Huang, Qunzeng; Lou, Qing; Liu, Zhiyu; Sun, Junlu; Zhang, Zhongtao; Qin, Shirong; Li, Xing; Zang, Jinhao; Dong, Lin; Shan, Chongxin

doi:10.1016/j.carbon.2018.06.048

Cited by 48 publications

(30 citation statements)

References 35 publications

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“…The N 1s spectrum also indicates the existence of pyridinic N (398.1 eV) and pyrrolic N (399.6 eV) in Figure S7b, Supporting Information . The O 1s band was shown to contain two main peaks associated to C = O at 531.4 eV and C–O at 532.2 eV, respectively (Figure S7c, Supporting Information) . Here, N exists predominantly as pyrrolic N. The large proportion of C = O (66.18%) observed from the O 1s spectrum also corresponds to the higher ‐COOH content (i.e., 42.44%) shown in the C 1s spectrum.…”

Section: Resultsmentioning

confidence: 99%

Scalable Synthesis of Green Fluorescent Carbon Dot Powders with Unprecedented Efficiency

Wei

Lou

Zang

et al. 2020

Advanced Optical Materials

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quantum yield (PL QY) of 93.3%; the highest yield to date among the blue-emitting CDs. [21] Sun and co-workers developed a CD synthesis technique using multicolored emission through controlled graphitization and surface functionalization. [1] They found the CD emission band to be tunable from 430 nm to 630 nm, which covers the blue and red region.Despite such large progress achieved for CD synthesis, plenty of barriers still exist to CD commercialization. Typically, CDs with great performance are primarily prepared through solvothermal routes, meaning at least several hours are needed to prepare CDs at milligram levels. [1,3,4,6,[19][20][21][22][23] Nevertheless, expensive precursors and complex purification processes will no doubt enlarge the construction costs and increase the preparation time. [3][4][5][6] In another way, CDs suffer from aggregation-causedquenching (ACQ) due to π-π stacking in the solid state, which has shown to greatly hinder the application of CDs in light-emitting fields. [24][25][26][27][28] To overcome this deficiency, efforts have been targeted to develop solid CDs with efficient fluorescence by way of CD monomer separation from direct contact, including CD implantation inside polymer matrices and combining them with inorganic salts as composites. [29][30][31][32][33][34][35][36][37][38] Although this effectively prevents the ACQ of CDs in solid state by the dispersal of CDs into various matrices, only CDs at lower loading fractions (i.e., <0.2 wt%) have the ability to achieve high PL QY. [39] While most white LEDs (WLEDs) are created using the one-step synthesis of white light-emitting CDs, the down-conversion fluorescent powders usually suffer from low luminous efficiency or color instability. [40][41][42] Therefore, it is paramount to develop solid CDs with high fluorescence efficiency and stability in facile, low cost, and high-output ways in order to satisfy scale-up industrial production and application.In this study, we report a facile one-step microwave-assisted heating method to prepare solid CDs with strong green emissions. Here, citric acid, urea, and sodium hydroxide (NaOH) have been used as precursors. The CDs were also made to be resistant to self-quenching by in situ embedding the CD into the crystal matrix of NaOH, so that the PL QY could reach 75.9% in the solid state. To the best of our knowledge, this is the highest value attained for solid CDs having green emission. [8,32,[35][36][37][38] Moreover, powdered CD (CDPs) would also have the potential to be prepared on a much larger scale in several minutes It still remains a challenge to synthesize solid-state carbon dots (CDs) with high emission efficiency; a hurdle that has hindered the application of CDs in many fields. In this work, efficient fluorescent CDs have been prepared through a one-step microwave-assisted heating method. Experimental data show strong green emissions produced from the CD powders (CDPs), carrying an unprecedented 75.9% quantum yield due to both spatial confinement and defect reduction with the ...

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Section: Resultsmentioning

confidence: 99%

Scalable Synthesis of Green Fluorescent Carbon Dot Powders with Unprecedented Efficiency

Wei

Lou

Zang

et al. 2020

Advanced Optical Materials

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“…Detonation NDs have a complex structure consisting of sp 3 carbon core and sp 2 carbon shell, with oxygen-containing function groups covering their surface [16,[33][34][35][36][37][38]. The size of NDs mostly used in photocatalytic reaction falls in the range of 5 nm in diameter [6,37,39]. The band gap of NDs is about 2-3.5 eV, which is much narrower than typical data of single-crystal diamond due to sp 2 carbon shell [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

“…The band gap of NDs is about 2-3.5 eV, which is much narrower than typical data of single-crystal diamond due to sp 2 carbon shell [18][19][20]. The unique structure and photoelectric property of NDs endow them great potential applications in the photocatalytic field: (1) the hydrophilic surface functional groups of NDs play a great role in photocatalytic activity [40][41][42]; (2) sp 2 carbon shell with unrivalled carrier mobility can facilitate the transfer of photogenerated carriers [43][44][45]; (3) sp 3 carbon core with intense light scattering can enhance visible light adsorption of photocatalyst [39]; (4) Narrowing band gap of NDs can extend light adsorption range of photocatalysts [18,19]; and (5) Environmental friendliness, mass production, high chemical stability, and low cost make NDs competitive photocatalyst in practical use [16,[46][47][48].…”

Section: Introductionmentioning

confidence: 99%

“…At present, some achievements have been made in the photocatalytic application of NDs. However, pristine NDs generally have no photocatalytic activity [19,39]. Surface functionalization is one of the most useful methods to enhance the photocatalytic activity of NDs [40,42,49].…”

Section: Introductionmentioning

confidence: 99%

“…the optical properties of nDs: (a) uV-vis absorption spectra of cu 2 o, nDs, nDs-cu 2 o, and physical mixture of nDs and cu 2 o [19]. (b) the scattering effect of the nDs in water solution [39]. (c) Fluorescence spectra of nDs suspended in water.…”

Section: Introductionmentioning

confidence: 99%

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Emerging applications of nanodiamonds in photocatalysis

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Hao

et al. 2021

Functional Diamond

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as a fascinating nanocarbon photocatalytic material, nanodiamonds (NDs) have attracted more and more attention recently due to their high chemical stability, high carrier mobility, narrowing band gap, easy surface modification, and mass production. this review summarizes the latest progress related to elaborated construction of NDs and NDs-based nanocomposite, including microstructure regulation of pristine NDs, elemental doping and formation a heterojunction by coupled with another semiconductor. the construction and properties of each category of NDs-based material are reviewed on their structure, preparation methods, texture control, and photocatalytic performance. Photocatalytic applications of NDs-based nanomaterials for hydrogen evolution from water splitting, organic pollution degradation, cO 2 reduction, N 2 reduction, graphene oxide reduction, and the latest advances in photocatalytic reaction mechanism have been also systematically reviewed. Finally, the challenges and prospects of the photocatalytic application of NDs are also briefly analyzed.

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Bright and Multicolor Chemiluminescent Carbon Nanodots for Advanced Information Encryption

et al. 2019

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The various luminescent properties of carbon nanodots (CDs) reveal fascinating applications in several areas. Here, bright and multicolor chemiluminescence (CL) is realized from CDs, whose CL quantum yield can be optimized by adjusting the energy level alignment between the CDs and 1,2‐dioxetanedione intermediate generated from the reaction of peroxalate and hydrogen peroxide. A CL quantum yield of 9.32 × 10 −3 Einsteins mol −1 , maximal luminance of 3.28 cd m −2 , and lifetime of 186.4 s are achieved in red CDs, all of which are the best values ever reported for CDs. As a proof‐of‐concept prototype, a high‐quality information encryption strategy is established via CD based CL imaging techniques by virtue of the high brightness and multicolor CL.

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Effective light scattering and charge separation in nanodiamond@g-C3N4 for enhanced visible-light hydrogen evolution

Cited by 48 publications

References 35 publications

Scalable Synthesis of Green Fluorescent Carbon Dot Powders with Unprecedented Efficiency

Scalable Synthesis of Green Fluorescent Carbon Dot Powders with Unprecedented Efficiency

Emerging applications of nanodiamonds in photocatalysis

Bright and Multicolor Chemiluminescent Carbon Nanodots for Advanced Information Encryption

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