Main Luminescent Centers of Carbonized Polymer Dots †

doi:10.7503/cjcu20190401

Abstract

Abstract:

Polyacrylic acid and ethylenediamine were used as precursors to synthesize carbonized polymer dots(CPDs) by hydrothermal method. Fluorescence spectroscopy and time-dependent single photon counting were used to characterize the CPDs formed under different carbonization temperatures(200, 240 and 280 ℃). The luminescence mechanism of these CPDs was explored by comparing their fluorescence lifetimes and the photobleaching process under a 375 nm light. The results prove that the luminescence of these CPDs are contributed by both the carbon core state and the molecular state.

Key words: Carbonized polymer dot, Luminescence mechanism, Photobleaching, Carbonization

CLC Number:

O644

TrendMD:

Xue ZHANG,Yijia GENG,Songyuan TAO,Shuping XU,Weiqing XU. Main Luminescent Centers of Carbonized Polymer Dots ^†[J]. Chem. J. Chinese Universities, 2019, 40(12): 2521.

Figures/Tables 7

Fig.1 Ultraviolet-visible absorption spectra and fluorescence excitation/emission spectra(A) and TCSPC spectra(B) of C1 in water at λex=375 nm

Fig.2 Proportions of three fluorescence lifetime components(Ⅰ, Ⅱ, and Ⅲ) of C1(A) and lifetime of components Ⅰ, Ⅱ and Ⅲ for C1 at different wavelengths(B)

Fig.3 Fluorescence spectra of C1 in acetone, DMF and water

Fig.4 Normalized fluorescence spectra(A) and the proportions of fluorescence lifetime components(Ⅱ and Ⅲ)(B) of C1, C2 and C3

Fig.5 Mean lifetimes at different emission wavelengths(A) and percentages of lifetime components Ⅱ and Ⅲ at the greatest emsission wavelength(400 nm)(B) of C1 after being bleached with a 375 nm laser for 0, 3 and 6 h

Fig.6 Ultraviolet-visible absorption spectra(A) and attenuated total reflection infrared spectra(B) of C1 before and after 6 h laser bleaching

Fig.7 Normalized fluorescence intensity evolutions of C1(at 409 nm), C2(at 462 nm) and C3(at 440 nm) under UV irradiation from 0 to 3 h

References 14

[1]	Xu X., Ray R., Gu Y., Ploehn H. J., Gearheart L., Raker K., Scrivens W. A ., J. Am. Chem. Soc., 2004,126(40), 12736— 12737 doi: 10.1021/ja040082h URL pmid: 15469243
[2]	Sun Y. P., Zhou B., Lin Y., Wang W., Fernando K. A. S., Pathak P., Meziani M. J., Harruff B. A., Wang X., Wang H., Luo P. G., Yang H., Kose M. E., Chen B., Veca L. M., Xie S. Y ., J. Am. Chem. Soc., 2006,128(24), 7756— 7757 doi: 10.1021/ja062677d URL pmid: 16771487
[3]	Zhu S., Song Y., Zhao X., Shao J., Zhang J., Yang B ., Nano Research, 2015,8(2), 355— 381 doi: 10.1007/s12274-014-0644-3 URL
[4]	Lim S., Shen W., Gao Z ., Chem. Soc. Rev., 2015,44, 362— 381 doi: 10.1039/c4cs00269e URL pmid: 25316556
[5]	Fu M., Ehrat F., Wang Y., Milowska K. Z., Reckmeier C., Rogach A. L., Stolarczyk J. K., Urban A. S., Feldmann J ., Nano Lett., 2015,15(9), 6030— 6035 doi: 10.1021/acs.nanolett.5b02215 URL pmid: 26269962
[6]	Krysmann M. J., Kelarakis A., Dallas P., Giannelis E. P ., J. Am. Chem. Soc., 2012,134(2), 747— 750 doi: 10.1021/ja204661r URL
[7]	Zhu S., Wang L., Zhou N., Zhao X., Song Y., Maharjan S., Zhang J., Lu L., Wang H., Yang B ., Chem. Commun., 2014,50, 13845 doi: 10.1039/c4cc05806b URL pmid: 25259373
[8]	Tao S., Song Y., Zhu S., Shao J., Yang B ., Polymer, 2017,116(5), 472— 478 doi: 10.1016/j.polymer.2017.02.039 URL
[9]	Wang L., Zhu S., Wang H., Qu S., Zhang Y., Zhang J., Chen Q., Xu H., Han W., Yang B., Sun H ., ACS Nano, 2014,8(3), 2541— 2547 doi: 10.1021/nn500368m URL pmid: 24517361
[10]	Xiong Y., Schneider J., Reckmeier C. J., Huang H., Kasákb P., Rogach A. L ., Nanoscale, 2017,9, 11730— 11738 doi: 10.1039/c7nr03648e URL pmid: 28782778
[11]	Chen Y., Lian H., Wei Y., He X., Chen Y., Wang B., Zeng Q., Lin J ., Nanoscale, 2018,10, 6734— 6743 doi: 10.1039/c8nr00204e URL pmid: 29589857
[12]	Jones S. S., Sahatiya P., Badhulika S ., New J. Chem., 2017,41, 13130— 13139 doi: 10.1039/C7NJ03513F URL
[13]	Zhu S., Meng Q., Wang L., Zhang J., Song Y., Jin H., Zhang K., Sun H., Wang H., Yang B ., Angew. Chem. Int. Ed., 2013,52(14), 3953— 3957 doi: 10.1002/anie.201300519 URL pmid: 23450679
[14]	Tao S., Lu S., Geng Y., Zhu S., Redfern S. A. T., Song Y., Feng T., Xu W., Yang B ., Angew. Chem. Int. Ed., 2018,57(9), 2393— 2398 doi: 10.1002/anie.201712662 URL pmid: 29356331