Bandgap-tunable black phosphorus quantum dots: visible-light-active photocatalysts

Yuan, Yong‐Jun; Yang, Shuhui; Wang, Pei; Yang, Yan; Li, Zijian; Chen, Daqin; Yu, Zhen‐Tao; Zou, Zhigang

doi:10.1039/c7cc08211h

Cited by 71 publications

(46 citation statements)

References 37 publications

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“…The peak of the UV–vis spectrum shown in Figure 2f indicates that the BP QDs have a thickness of one to two layers. The broad region at 450 nm is consistent with the previous result of BP QDs 40. Fourier‐transform infrared (FT‐IR) spectrum and identification of organic groups and chemical bonds are shown in Figure S6 in the Supporting Information.…”

Section: Resultssupporting

confidence: 89%

A Fluorescence Probe for Metal Ions Based on Black Phosphorus Quantum Dots

Yuan

et al. 2020

Adv Materials Inter

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spectroscopy (ICP-AES), and surface plasmon resonance sensing. [4][5][6] Although these methods have high detection performances, the complicated preprocessing process and the excessive cost limit their range of use and the detection rate. On the other hand, with the advancement of fluorescence technology, fluorescence detection techniques for metal ions by monitoring the fluorescence enhancement, quenching, or shifting of peak positions have attracted great interests. This type of method has advantages of strong visibility, simple operation, wide detection range, and low price. [7] Recently, quantum dot (QD) fluorescent probes are gradually receiving more attentions. Compared with the traditional organic fluorescent materials, QD fluorescent probes have narrower emission spectra, better stability, and photobleaching resistance. For example, carbon QDs, [8,9] CdSe QDs, [10] CdS QDs, [11] perovskites QDs, [12] and a combination of functional molecules and QDs have been studied to detect metal ions such as Fe 3+ , Pb 2+ , Hg 2+ , Zn 2+ , and Cd 2+ . [13][14][15][16][17][18] However, currently reported fluorescent probes can be used in only one solvent, it is therefore necessary to develop fluorescent probes with strong selectivity, wide detection range, and low detection limit, which can be used in both aqueous and organic solutions.Black phosphorus (BP) as one of the three major allotropes of phosphorus is a 2D van der Waals material whose atomic layers are stacked by weak van der Waals forces. BP can be stripped into nanosheets down to a single layer or quantum dots with bandgaps varying from 0.3 (bulk BP) to 2.0 eV. Due to this unique property, BP has the size and composition-dependent light absorption, long exciton lifetime, high photo luminescence quantum yield, and ability of surface modification. So far, BP has been used as photothermal agents, photodetectors, photocatalysts, organic photovoltaics, electrocatalysts, and the storage media. [19][20][21][22][23][24] BP has also been studied in the field of sensors, such as humidity sensors, [25] ratiometric fluorescent probes developed by the surface modification of organic molecules, [26,27] field effect transistor detection of metal ions. [28] In addition, BP has a wide range of applications in the biological field, including the medicine, drug carriers, and cancer treatment. [29][30][31] In this research, we have successfully prepared black phosphorus quantum dots (BP QDs) with green fluorescence emission, which can directly detect trace Hg 2+ and Cu 2+ ions without the help of organic molecules. In particular, Fluorescence method for detecting metal ions has advantages of fast detection speed, simple operation, and low price over the conventional methods. Black phosphorus quantum dots (BP QDs) have high photoluminescence quantum yield and modifiable surface, which have great potential in the field of fluorescent probes. In this study, high quality BP QDs are prepared by pyrolysis method and are first time used as trace metal ion probes in both organic solut...

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Section: Resultssupporting

confidence: 89%

A Fluorescence Probe for Metal Ions Based on Black Phosphorus Quantum Dots

Yuan

et al. 2020

Adv Materials Inter

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“…[2][3][4][5][6][7][8][9][10][11] Owing to the unique optical and electrical properties, BP holds large promise in the fields of energy and catalysis. [12][13][14][15][16][17][18][19] In particular, BP has a thicknessdependent direct bandgap ranging from 0.3 to 2.1 eV, leading to broad absorption spanning the ultraviolet (UV) and near-infrared only 25 min. The photocatalytic efficiency is comparable to that of previously reported BP/CN heterostructures composed of BP nanosheets or quantum dots.…”

Section: Visible-light Photocatalysismentioning

confidence: 99%

“…[33][34][35][36] Nevertheless, efficient synthesis of BP/CN heterostructures is still challenging and the BP materials used in production are typically limited to ultrathin nanosheets and quantum dots. [12][13][14][15][16][17][18][19] In particular, BP has a thicknessdependent direct bandgap ranging from 0.3 to 2.1 eV, leading to broad absorption spanning the ultraviolet (UV) and near-infrared All in all, an economical synthetic technique to prepare BPbased heterostructured photocatalysts is still lacking.…”

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confidence: 99%

A Low‐Cost Metal‐Free Photocatalyst Based on Black Phosphorus

et al. 2018

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An efficient metal‐free photocatalyst composed of black phosphorus (BP) and graphitic carbon nitride (CN) is prepared on a large scale by ball milling. Using economical urea and red phosphorus (RP) as the raw materials, the estimated materials cost of BP/CN is 0.235 Euro per gram. The BP/CN heterostructure shows efficient charge separation and possesses abundant active sites, giving rise to excellent photocatalytic H2 evolution and rhodamine B (RhB) degradation efficiency. Without using a co‐catalyst, the metal‐free BP/CN emits H2 consistently at a rate as large as 786 µmol h−1 g−1 and RhB is decomposed in merely 25 min during visible‐light irradiation. The corresponding electron/hole transfer and catalytic mechanisms are analyzed and described. The efficient metal‐free catalyst is promising in visible‐light photocatalysis and the simple ball‐milling synthetic method can be readily scaled up.

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“…According to the UV/Vis absorption curves and Kubeka‐Munk plots, the absorption of AgCl QDs is 391 nm with a band gap of 3.07 eV (Figure B). Compared to bulk AgCl, AgCl QDs have showed a significant blue shifted absorbance edges and extended band gaps (Figure A), which could be accredited to quantum confinement effect . Besides, it was found that visible light absorption edge of rGO/AgCl QDs has red shifted as compared with pristine AgCl QDs, indicating a narrowed band gap of AgCl QDs, which is attributed to the interfacial interaction between AgCl QDs and rGO .…”

Section: Resultsmentioning

confidence: 95%

“…Compared to bulk AgCl, AgCl QDs have showed a significant blue shifted absorbance edges and extended band gaps ( Figure S1A), which could be accredited to quantum confinement effect. 34,35 Besides, it was found that visible light absorption edge of rGO/AgCl QDs has red shifted as compared with pristine AgCl QDs, indicating a narrowed band gap of AgCl QDs, which is attributed to the interfacial interaction between AgCl QDs and rGO. 36 To further evaluate the interfacial contact between AgCl QDs and rGO, photoelectrochemical measurements were carried out.…”

Section: Resultsmentioning

confidence: 99%

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

et al. 2019

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A novel rGO/AgCl QDs composites have been obtained by an ultrasonic‐assisted method for the first time. Photoelectrocatalytic (PEC) performances of the obtained samples were studied by the degradation of 20 mg/L Tetracycline (TC) under visible light irradiation with an applied bias potential of 1.5 V (vs Ag/AgCl). Degradation of TC by different processes including Photocatalysis (PC), Electrocatalysis (EC), and PEC was compared, and the effect of different bias potential on the PEC degradation of TC was discussed. Results showed that rGO/AgCl QDs composites had displayed superior PEC activity than that of pristine AgCl QDs with degrading 85.2% of TC during 120 minutes, which was about 1.5 times higher than that of AgCl QDs (33%). Besides, compared to PC and EC removal of TC, PEC process showed the highest degradation efficiency of TC (85.2%) by rGO/AgCl QDs, which was about three times and one time higher than that of PC (39.18%) and EC (20.73%) system, respectively. Moreover, the reusibility and stability of the samples were tested by five times cycling tests, and results demonstrated that the stability of bare AgCl QDs was improved after the introduction of rGO. The enhanced PEC activity and stability of the samples could be attributed to the intimate contact between rGO and AgCl QDs and external electric field, which had benefitted the formation of more active sites and accelerated electron‐hole separation.

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Bandgap-tunable black phosphorus quantum dots: visible-light-active photocatalysts

Cited by 71 publications

References 37 publications

A Fluorescence Probe for Metal Ions Based on Black Phosphorus Quantum Dots

A Fluorescence Probe for Metal Ions Based on Black Phosphorus Quantum Dots

A Low‐Cost Metal‐Free Photocatalyst Based on Black Phosphorus

Preparation of rGO/AgCl QDs and its enhanced photoelectrocatalytic performance for the degradation of Tetracycline

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