Water-soluble multicolored fluorescent CdTe quantum dots: Synthesis and application for fingerprint developing

Liu, Jianjun; Shi, Zhixia; Yu, Yingchun; Yang, Renqiang; Zuo, Shengli

doi:10.1016/j.jcis.2009.10.061

Cited by 96 publications

(63 citation statements)

References 28 publications

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“…It is also noteworthy that with a suitable surface modification using organic ligands such as non-toxic mercaptans allows to obtain ZnS nanoparticles which exhibit enhanced luminescence properties, water-solubility, colloidal stability, and size controllability [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

et al. 2015

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We report an advanced method for the self-organization of an optomagnetic nanocomposite composed of both fluorescent clusters (ZnS quantum dots, QDs) and magnetic nanoparticles (CoFe2O4). ZnS nanocrystals were prepared via an aqueous method at different temperatures (25, 50, 75, and 100 °C). Their structural, optical and chemical properties were comprehensively characterized by X-ray diffraction (XRD), UV-Vis, photoluminescence (PL) spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), transmission electron microscopy (TEM), and infrared spectroscopy (FT-IR). The highest PL intensity was observed for the cubic ZnS nanoparticles synthesized at 75 °C which were then stabilized electrosterically using thioglycolic acid. The photophysical analysis of the capped QDs with particle size in the range 9-25 nm revealed that the emission intensity increases and the optical band gap rises compared to uncapped nanocrystals (3.88 to 4.02 eV). These band gaps are both wider than that of bulk ZnS resulting from the quantum confinement effect. Magnetic nanoparticles were synthesized via a coprecipitation route and a sol-gel process was used to form the functionalized, silica-coated CoFe2O4. Finally, thiol coordination was used for binding the QDs to the surface of the magnetic nanoparticles. The fluorescence intensity and magnetic properties of the nanocomposites are related to the ratio of ZnS and CoFe2O4. As-prepared optomagnetic nanocomposite with small size (12-45 nm), acceptable saturation magnetization (about 6.7 emu/g), and satisfactory luminescent characteristics could be successfully prepared. These are promising candidates for biological and photocatalytic applications.

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Section: Introductionmentioning

confidence: 99%

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

et al. 2015

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“…The resultant fluorescent NMs can selectively label a specific component in fingerprints by chemical reactions to reach an increased developing selectivity. [37] The fluorescent NMs can also be modified with some special molecules such as lysozyme-binding aptamer, which could conjugate with the lysozymes in fingerprint residues providing high selectivity. [38] …”

Section: Advantages Of Using Fluorescent Nanomaterials For Developmentioning

confidence: 99%

Fluorescent Nanomaterials for the Development of Latent Fingerprints in Forensic Sciences

Wang

et al. 2017

Adv Funct Materials

197

159

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This review presents an overview on the application of latent fingerprint development techniques in forensic sciences. At present, traditional developing methods such as powder dusting, cyanoacrylate fuming, chemical method, and small particle reagent method, have all been gradually compromised given their emerging drawbacks such as low contrast, sensitivity, and selectivity, as well as high toxicity. Recently, much attention has been paid to the use of fluorescent nanomaterials including quantum dots (QDs) and rare earth upconversion fluorescent nanomaterials (UCNMs) due to their unique optical and chemical properties. Thus, this review lays emphasis on latent fingerprint development based on QDs and UCNMs. Compared to latent fingerprint development by traditional methods, the new methods using fluorescent nanomaterials can achieve high contrast, sensitivity, and selectivity while showing reduced toxicity. Overall, this review provides a systematic overview on such methods.

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“…5a showed broad peaks typical for the original CdTe QDs. Three obvious diffractive peaks were observed which corresponded to the (1 1 1), (2 2 0) and (3 1 1) reflections of cubic zinc blende CdTe [45][46][47]. After addition of the FSN-capped gold nanoparticles into the original CdTe colloidal solution, the new-born CdTe QDs revealed the same diffraction peaks as the original nanostructures (Fig.…”

Section: Characterization Of the New-born Cdte Qdsmentioning

confidence: 99%

Ligand exchange on the surface of cadmium telluride quantum dots with fluorosurfactant-capped gold nanoparticles: Synthesis, characterization and toxicity evaluation

Wang¹,

Zhang²,

Lu³

et al. 2014

Journal of Colloid and Interface Science

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a b s t r a c tCdTe quantum dots (QDs) can provide high-intensity and photostable luminescent signals when they are used as labeling materials for sensing trace amounts of bioanalytes. However, a major concern is whether the capping ligands of CdTe QDs cause toxic effects in living systems. In the current study, we address this problem through the complete ligand transformation of CdTe QDs from toxic thiolglycolic acid (TGA) to green citrate, which is attributed to the CdAS bond breaking and the AuAS bond formation. The highly efficient depletion of S atom from the surface of the CdTe QDs occurs after the addition of fluorosurfactant (FSN)-capped gold nanoparticles into TGA-capped CdTe QDs, accompanying with the rapid aggregation of FSN-capped gold nanoparticles via noncrosslinking mechanism in the presence of high salt. After the ligand transformation, negligible differences are observed on both photoluminescence spectra and luminescent quantum yield. In addition, the cytotoxicity of the original and new-born CdTe QDs is detected by measuring cell viability after the nanoparticle treatment. In comparison with the original TGA-capped QDs, the new-born CdTe QDs can induce minimal cytotoxicity against human hepatocellular liver carcinoma (HepG2) cells even at high dosages. Our study indicates that the extremely simple method herein opens up novel pathways for the synthesis of green CdTe QDs, and the as-prepared citrate-capped CdTe QDs might have great potential for biological labeling and imaging applications.

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Water-soluble multicolored fluorescent CdTe quantum dots: Synthesis and application for fingerprint developing

Cited by 96 publications

References 28 publications

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

Fluorescent Nanomaterials for the Development of Latent Fingerprints in Forensic Sciences

Ligand exchange on the surface of cadmium telluride quantum dots with fluorosurfactant-capped gold nanoparticles: Synthesis, characterization and toxicity evaluation

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Water-soluble multicolored fluorescent CdTe quantum dots: Synthesis and application for fingerprint developing

Cited by 96 publications

References 28 publications

Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

Self-organization of an optomagnetic CoFe2O4–ZnS nanocomposite: preparation and characterization

Fluorescent Nanomaterials for the Development of Latent Fingerprints in Forensic Sciences

Ligand exchange on the surface of cadmium telluride quantum dots with fluorosurfactant-capped gold nanoparticles: Synthesis, characterization and toxicity evaluation

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Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization

Self-organization of an optomagnetic CoFe₂O₄–ZnS nanocomposite: preparation and characterization