New insights into the complexities of shell growth and the strong influence of particle volume in nonblinking "giant" core/shell nanocrystal quantum dots

Journal of the American Chemical Society
Yagnaseni GhoshJennifer A Hollingsworth

Abstract

The growth of ultra-thick inorganic CdS shells over CdSe nanocrystal quantum dot (NQD) cores gives rise to a distinct class of NQD called the "giant" NQD (g-NQD). g-NQDs are characterized by unique photophysical properties compared to their conventional core/shell NQD counterparts, including suppressed fluorescence intermittency (blinking), photobleaching, and nonradiative Auger recombination. Here, we report new insights into the numerous synthetic conditions that influence the complex process of thick-shell growth. We show the individual and collective effects of multiple reaction parameters (noncoordinating solvent and coordinating-ligand identities and concentrations, precursor/NQD ratios, precursor reaction times, etc.) on determining g-NQD shape and crystalline phase, and the relationship between these structural features and optical properties. We find that hexagonally faceted wurzite g-NQDs afford the highest ensemble quantum yields in emission and the most complete suppression of blinking. Significantly, we also reveal a clear correlation between g-NQD particle volume and blinking suppression, such that larger cores afford blinking-suppressed behavior at relatively thinner shells compared to smaller starting core sizes...Continue Reading

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Citations

Sep 26, 2013·Chemistry of Materials : a Publication of the American Chemical Society·Jennifer A Hollingsworth
Aug 6, 2013·ACS Nano·Susanna M ThonEdward H Sargent
Dec 4, 2012·International Journal of Molecular Sciences·Erin A RileyPhilip J Reid
Nov 25, 2014·The Journal of Chemical Physics·Ke Gong, David F Kelley
Jan 27, 2015·Cell and Tissue Research·Tania Q VuDiane S Lidke
Aug 12, 2015·The Journal of Physical Chemistry Letters·Melissa PauliteHan Htoon
Nov 3, 2016·Journal of the American Chemical Society·Eva BladtSara Bals
Mar 31, 2017·ACS Applied Materials & Interfaces·Lei ZhangJiayu Zhang
May 13, 2017·Nature Communications·Nimai MishraJennifer A Hollingsworth
Jan 7, 2015·Journal of the American Chemical Society·Kevin WelsherHaw Yang
Mar 4, 2017·Advanced Materials·Haiyan QinXiaogang Peng
Dec 21, 2016·Chemical Communications : Chem Comm·Youngjin JangEfrat Lifshitz
Feb 13, 2016·Nanoscale·Aidi ZhangJicun Ren
Jul 12, 2017·ACS Nano·Yazgan TunaVahid Sandoghdar
Apr 15, 2016·Physical Chemistry Chemical Physics : PCCP·Mohammad Mahdi TavakoliAbdolreza Simchi
Jun 7, 2018·Chemical Communications : Chem Comm·Michael J Enright, Brandi M Cossairt
Jun 20, 2018·Chemical Society Reviews·Yufeng ZhouFederico Rosei
Jun 21, 2012·Nature Communications·Christophe GallandVictor I Klimov
Nov 5, 2019·The Journal of Chemical Physics·James R McBride, Sandra J Rosenthal
Jul 22, 2020·Advanced Healthcare Materials·Mingfu ChenMark W Grinstaff
Mar 24, 2015·Advanced Functional Materials·Aaron M KellerJames H Werner

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