碳量子點(diǎn)的制備與介紹

1、Ascorbic Acid Assisted Green Route for Synthesis of Water Dispersible Carbon Dots 孔文瀚孔文瀚 201341603030 1、Introduction2、Experimental2.1 Materials2.2 Synthesis Method 2.3 Characterization3、Future targetContent1.IntroductionCarbon quantum dots (CQDs) are a new class of quantum dots materialsInorganic qu

2、antum dotsCarbon quantum dots Ref. 1 Youfu Wang, Aiguo Hu. J. Mater. Chem. C, 2014, 2, 69216939 2 Shi Ying Lim, Wei Shen and Zhiqiang Gao, Chem. Soc. Rew., 2015, 362-281 The carbon dots were reported as potential candidates to replace heavy metal QDs,especially for biological applications.The synthe

3、sis of carbon dots mainly consists of three steps： synthesis of raw carbon dots, surface passivation and functionalization.Raw carbon dots are synthesized by top down and bottom up approaches.Top down method includes arc-discharge,laser ablation and several electrochemichal methods,while bottom up a

4、pproach includes the methods like thermal carbonization of carbon precursors,acid dehydration of carbohydrates，heating by microwave or ultrasonic treatment of acidified carbon sources.2.Experimenta2.1 MaterialsAscorbic acid(99)，phenol and 2-aminophenol were purchased from Tianjin Guangfu Chemical Co

5、，ChinaL-Lysine(99) was purchased from Dingguo Corporation， Shanghai，ChinaAll other reagents were of analytical grade and used without further purification2.Synthetic methodsMany methods have been proposed to prepare CQDs during the last decade, which can be roughly classified into “Top-down” and “Bo

6、ttom-up” approaches. 146 mg(1 mm01)of L-lysine and 176 mg(1 mm01)of ascorbic acid were dissolved in 20 mL of distilled H，O and stirred for l hThen the solution was transferred to an autoclave for further condensation at 140。C for 12 hFinally,the carbon dot solution was obtained after centrifugation

7、to remove the suspended particles，then the sample was dialyzed for 24 h to remove the organic functional groups 2.3 CharacterizationTransmission electron microscopy(TEM) experimentswere performed on a JEM-3010 electron microscope(JEOL, Japan) at an acceleration voltage of 300 kVPL spectra were recor

8、ded with a Perkin-Elmer LS55 luminescence spectrometer Fourier transform infrared(FTIR)spectra were collected on a Nicolet Impact 410 FTIR spectrometer in a range of400-4000 1/cmElemental analysis was carried out on Perkin-Elmer Optima 3300DV inductively coupled plasma-optical emission spectrometer(

9、ICP-OES)X-Ray photoelectron spectroscopy (XPS)spectra were obtained on a Thermo ESCALAB 250 with Al K radition at =90 ,the binding energies were calibrated with the C1。peak at 284.9 eV3.Results and Discussion3.Results and DiscussionFig1 shows the TEM image of carbon dots synthesized from ascorbic acid and lysinegiving direct observation of the carbon dots，which are uniformly distributed with the sizes ranged at 1012 nmIt was observed and confirmedby changing in color and then checking luminescence under UV lamp，that carbon dots sta