Real-time monitoring of the UV-induced formation of quantum dots on a milliliter, microliter, and nanoliter scale
- 253 Downloads
The authors report on a systematic study on the low-cost, low-temperature, and fast synthesis of water soluble quantum dots (QDs) stabilized by mercaptosuccinic acid by UV irradiation. The effects of UV irradiation (at 254 nm and 250 nm) and temperature on the precursors (Cd:Se, Cd:Te, Cd, Zn:S, Zn:Se and Zn) are described. Best results are achieved with a mixture of precursors containing cadmium, selenium and MSA where a 10-min irradiation with 254-nm light gives CdSe QDs with a quantum yield of 13.5%. The authors also describe the preparation and monitoring of the formation of QDs in sub-mg, sub-μg and sub-ng quantities, the smallest concentration being 258 pg in volume of 4 nL. The growth of the QDs can be monitored in real time by absorption, fluorescence and dynamic light scattering. The solutions of the particles also are characterized by fluorescence correlation spectroscopy and detected by LED-induced fluorescence. The preparation of such QDs by UV radiation is simple, easily controllable, and inexpensive. Conceivably, it can be integrated with lab-on-chip, micro total analysis systems or other instrumentation.
KeywordsNanocrystal Capillary electrophoresis Irradiation Fluorescence
Financial support was provided by Grant agency of Czech Republic (GACR 16-23647Y) and project CEITEC 2020 (LQ1601) with financial support from the Ministry of Education, Youth and Sports of the Czech Republic under the National Sustainability Programme II.
Compliance with ethical standards
The author(s) declare that they have no competing interests.
- 2.Singh G, Fisch M, Kumar S (2016) Emissivity and electrooptical properties of semiconducting quantum dots/rods and liquid crystal composites: a review. Rep Prog Phys 79Google Scholar
- 12.Ghosh B, Shirahata N (2014) Colloidal silicon quantum dots: synthesis and luminescence tuning from the near-UV to the near-IR range. Sci Technol Adv Mater 15(1):014207Google Scholar
- 14.Koch CC (2003) Top-down synthesis of nanostructured materials: mechanical and thermal processing methods. Rev Adv Mater Sci 5:91–99Google Scholar
- 15.Amendola V, Meneghetti M, Granozzi G, Agnoli S, Polizzi S, Riello P, Boscaini A, Anselmi C, Fracasso G, Colombatti M, Innocenti C, Gatteschi D, Sangregorio C (2011) Top-down synthesis of multifunctional iron oxide nanoparticles for macrophage labelling and manipulation. J Mater Chem 21:3803–3813CrossRefGoogle Scholar
- 16.Bertino MF, Gadipalli RR, Martin LA, Heckman B, Leventis N, Guha S, Katsoudas J, Divan R, Mancini DC (2008) 236th National Meeting of the American-Chemical-Society, Philadelphia, PA, Aug 17-21, 2008. Published in: Abstracts of papers of the American Chemical Society, Vol. 236Google Scholar
- 25.Li XQ, Xu HZ, Chen ZS, Chen GF (2011) Biosynthesis of nanoparticles by microorganisms and their applications. J Nanomater. doi: 10.1155/2011/270974
- 27.Borovaya MN, Naumenko AP, Matvieieva NA, Blume YB, Yemets AI (2014) Biosynthesis of luminescent CdS quantum dots using plant hairy root culture. Nanoscale Res Lett 9. doi: 10.1186/1556-276X-9-686
- 29.Sastry M, Ahmad A, Khan MI, Kumar R (2003) Biosynthesis of metal nanoparticles using fungi and actinomycete. Curr Sci 85:162–170Google Scholar
- 34.Uematsu T, Kitajima H, Kohma T, Torimoto T, Tachibana Y, Kuwabata S (2009) Tuning of the fluorescence wavelength of CdTe quantum dots with 2 nm resolution by size-selective photoetching. Nanotechnology 20(21):215302Google Scholar
- 40.Carrillo-Carrion C, Cardenas S, Simonet BM, Valcarcel M (2009) Quantum dots luminescence enhancement due to illumination with UV/Vis light. Chem Commun 45(35):5214–5226Google Scholar