Emergence of 2MPA as an Effective Coating for Highly Stable and Luminescent Quantum Dots

Date

2009-06-11

Author

Acar, Havva Yagci
Kas, Recep
Yurtsever, Ersin
Özen, Can
Lieberwirth, Ingo

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

268
views

0
downloads

3-Mercaptopropionic acid (3MPA) is a popular coating material for the preparation of aqueous quantum dots, yet its isomer 2-mercaptopropionic acid (2MPA) has not been much studied. Here, we present a detailed study on the aqueous synthesis of CdS quantum dots with a 2MPA coating. Reaction variables Such as the Cd/S ratio, 2MPA/Cd ratio, pH, and temperature were individually studied to evaluate the influence of these variables on particle size and luminescence. At the optimum ratios and reaction conditions, a quantum yield (QY) as high as 54% was achieved. These quantum dots (QDs) have exhibited excellent colloidal and photostability over eight months of study. The color of the emission can be tuned by the reaction temperature and/or Cd/S ratio. 3MPA-coated US nanoparticles were prepared at various 3MPA/Cd ratios for comparison. The highest QY achieved for CdS-3MPA was 15%, and the luminescence decreased dramatically overtime. Ab initio calculations and spectroscopic characterization did not reveal a significant difference in the structure or particle-coating interaction between 2MPA- and 3MPA-coated QDs. Luminesence lifetime measurements indicated longer lifetimes and a larger contribution of the surface-related emission, indicating better removal of quenching defects froth the surface in 2MPA-coated particles compared to that of CdS-3MPA. On the basis of the provided evidence, we report 2MPA as a new and better alternative to the widely used 3MPA for superior luminescence and long-term photo and colloidal stability.

Subject Keywords

CDTE Nanocrystals, Aqueous synthesis, Size, CDS, Photolumınescence, Nanoparticles, Composites, Dependence, Clusters, State

URI

https://hdl.handle.net/11511/30335

Journal

JOURNAL OF PHYSICAL CHEMISTRY C

DOI

https://doi.org/10.1021/jp811104s

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Development of highly luminescent and cytocompatible near-IR-emitting aqueous Ag2S quantum dots Hocaoglu, Ibrahim; Cizmeciyan, M. Natali; ERDEM, Rengin; Özen, Can; KURT, Adnan; Sennaroglu, Alphan; Acar, Havva Yagci (2012-01-01) Colloidally stable and highly luminescent near-IR emitting Ag2S quantum dots (NIRQDs) were prepared by a very simple aqueous method using 2-mercaptopropionic acid (2MPA) as a coating. Emission of Ag2S-2MPA NIRQDs can be tuned between 780 and 950 nm. These NIRQDs have photoluminescence quantum yields (PLQY) around 7-39% and exhibit excellent cytocompatibility even at 600 mu g mL(-1) in NIH/3T3 cells. With such improved properties, Ag2S-2MPA NIRQDs have a great potential in practical bio-applications.
SYNTHESIS OF TiO2 NANOSTRUCTURES VIA HYDROTHERMAL METHOD Bilgin, Nursev; Agartan, Lutfi; PARK, JONGEE; Öztürk, Abdullah (2014-10-16) Titania (TiO2) nanostructures were produced via hydrothermal method using amorphous TiO2 powders synthesized by the sol-gel precipitation process. The hydrothermal system was isolated from the environment and hydrothermal reactions were allowed to execute at 130 degrees C for 36 h at autogeneous pressure, and at a stirring rate of 250 rpm. Scanning electron microscopy (SEM) analysis revealed that TiO2 nanofibers formed instead of nanotubes upon utilization of amorphous TiO2 precursor. After hydrothermal syn...
Development of polybenzimidazole/graphene oxide composite membranes for high temperature PEM fuel cells Uregen, Nurhan; Pehlivanoglu, Kubra; Ozdemir, Yagmur; DEVRİM, YILSER (2017-01-26) In this study, phosphoric acid doped Polybenzimidazole/Graphene Oxide (PBI/GO) nano composite membranes were prepared by dispersion of various amounts of GO in PBI polymer matrix followed by phosphoric acid doping for high temperature proton exchange membrane fuel cell (HT-PEMFC) application. The structure of the PBI/GO composite membranes was investigated by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and by thermogravimetric analysis (TGA). The introduction of GO into the FBI polymer matri...
Experimental characterizations of the response of nematic liquid crystal droplets upon adsorption of nanoparticles from aqueous media Şengül, Selin; Büküşoğlu, Emre; Aydoğan, Nihal; Department of Chemical Engineering (2021-9-08) Nematic liquid crystal (LC) droplets have been widely used for the detection of molecular species. In this study, we investigated the response of micrometer sized nematic LC droplets against the adsorption of nanoparticles from aqueous media. In the first part of this study, we synthesized ~100 nm-in-diameter silica nanoparticles and modified their surfaces to mediate either planar or homeotropic LC anchoring and a pH-dependent charge. Secondly, we carried out the adsorption of nanoparticles to the LC-aqueo...
Improvement in magnetic properties of La substituted BaFe12O19 particles prepared with an unusually low Fe/Ba molar ratio Sozeri, H.; KÜÇÜK, İLKER; Ozkan, H. (2011-07-01) In this study, effect of lanthanum substitution on the phase composition, lattice parameters and magnetic properties of barium hexaferrite has been studied in samples synthesized in ammonium nitrate melt. Samples, prepared with different lanthanum amount and having various initial Fe/(Ba + La) ratios in between 12 and 2 {(Ba1-xLax).n Fe2O3, where 0 <= x <= 1 and 1 <= n <= 6)}, are sintered at temperatures from 800 to 1200 degrees C. The lattice parameters, both a and c, decreases with increasing La amount w...

Citation Formats

H. Y. Acar, R. Kas, E. Yurtsever, C. Özen, and I. Lieberwirth, “Emergence of 2MPA as an Effective Coating for Highly Stable and Luminescent Quantum Dots,” JOURNAL OF PHYSICAL CHEMISTRY C, pp. 10005–10012, 2009, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30335.