Synthesis of aqueous CdTe quantum dots embedded silica nanoparticles and their applications as fluorescence probes

Wang, Chao; Ma, Qingjie; Dou, Wenchao; Kanwal, Shamsa; Wang, Guannan; Yuan, Pingfan; Su, Xingguang

doi:10.1016/j.talanta.2008.09.018

Cited by 108 publications

(66 citation statements)

References 20 publications

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“…Then, the red QD-embedded silica nanoparticles (QD@SiO 2 ) were synthesized by reverse microemulsion according to the report method (Wang et al, 2009). Meanwhile, the APTES-NBD conjugates were synthesized using our developed method (Wang et al, 2016).…”

Section: Preparation Of Mip-based Fluorescence Sensormentioning

confidence: 99%

A molecular imprinting-based turn-on Ratiometric fluorescence sensor for highly selective and sensitive detection of 2,4-dichlorophenoxyacetic acid (2,4-D)

Wang

et al. 2016

Biosensors and Bioelectronics

169

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a b s t r a c tA novel molecular imprinting-based turn-on ratiometric fluorescence sensor was constructed via a facile sol-gel polymerization for detection of 2,4-dichlorophenoxyacetic acid (2,4-D) on the basis of photoinduced electron transfer (PET) by using nitrobenzoxadiazole (NBD) as detection signal source and quantum dots (QDs) as reference signal source. With the presence and increase of 2,4-D, the amine groups on the surface of QDs@SiO 2 could bind with 2,4-D and thereby the NBD fluorescence intensities could be significantly enhanced since the PET process was inhibited, while the QDs maintained constant intensities. Accordingly, the ratio of the dual-emission intensities of green NBD and red QDs could be utilized for turn-on fluorescent detection of 2,4-D, along with continuous color changes from orange-red to green readily observed by the naked eye. The as-prepared fluorescence sensor obtained high sensitivity with a low detection limit of 0.14 μM within 5 min, and distinguished recognition selectivity for 2,4-D over its analogs. Moreover, the sensor was successfully applied to determine 2,4-D in real water samples, and high recoveries at three spiking levels of 2,4-D ranged from 95.0% to 110.1% with precisions below 4.5%. The simple, rapid and reliable visual sensing strategy would not only provide potential applications for high selective ultratrace analysis of complicated matrices, but also greatly enrich the research connotations of molecularly imprinted sensors.

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Section: Preparation Of Mip-based Fluorescence Sensormentioning

confidence: 99%

A molecular imprinting-based turn-on Ratiometric fluorescence sensor for highly selective and sensitive detection of 2,4-dichlorophenoxyacetic acid (2,4-D)

Wang

et al. 2016

Biosensors and Bioelectronics

169

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“…Molecularly imprinted silica nanospheres with embedded CdTe QDs are usually prepared by two methods (i.e., the reverse-microemulsion and Stober methods). For the typical reverse-microemulsion method, 34 1.8 mL of TX-100 and 1.8 mL of n-hexanol were dispersed in 7.5 mL of cyclohexane, 500 μL of TGA-capped CdTe QDs, 60 μL of PDDA solution (0.075%, v/v), and 60 μL of ammonia to form a microemulsion. Next, 100 μL of TEOS was added to the microemulsion system to initiate the hydrolysis.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Dummy Molecularly Imprinted Polymers-Capped CdTe Quantum Dots for the Fluorescent Sensing of 2,4,6-Trinitrotoluene

et al. 2013

ACS Appl. Mater. Interfaces

273

149

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Molecularly imprinted polymers (MIPs) with trinitrophenol (TNP) as a dummy template molecule capped with CdTe quantum dots (QDs) were prepared using 3-aminopropyltriethoxy silane (APTES) as the functional monomer and tetraethoxysilane (TEOS) as the cross linker through a seedgrowth method via a sol−gel process (i.e., DMIP@QDs) for the sensing of 2,4,6-trinitrotoluene (TNT) on the basis of electrontransfer-induced fluorescence quenching. With the presence and increase of TNT in sample solutions, a Meisenheimer complex was formed between TNT and the primary amino groups on the surface of the QDs. The energy of the QDs was transferred to the complex, resulting in the quenching of the QDs and thus decreasing the fluorescence intensity, which allowed the TNT to be sensed optically. DMIP@QDs generated a significantly reduced fluorescent intensity within less than 10 min upon binding TNT. The fluorescence-quenching fractions of the sensor presented a satisfactory linearity with TNT concentrations in the range of 0.8−30 μM, and its limit of detection could reach 0.28 μM. The sensor exhibited distinguished selectivity and a high binding affinity to TNT over its possibly competing molecules of 2,4-dinitrophenol (DNP), 4-nitrophenol (4-NP), phenol, and dinitrotoluene (DNT) because there are more nitro groups in TNT and therefore a stronger electron-withdrawing ability and because it has a high similarity in shape and volume to TNP. The sensor was successfully applied to determine the amount of TNT in soil samples, and the average recoveries of TNT at three spiking levels ranged from 90.3 to 97.8% with relative standard deviations below 5.12%. The results provided an effective way to develop sensors for the rapid recognition and determination of hazardous materials from complex matrices.

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“…Nanopartiсles of CdTe were prepared in aqueous solution at room temperature using procedure similar to described in [17,18]. Briefly, Cd precursor solutions were prepared by mixing 3 mmol of CdCl 2 with 225 ml of ultrapure water followed by 7.7 mmol of thioglycolic acid (TGA) under magnetic stirring.…”

Section: Methodsmentioning

confidence: 99%

“…Early detection is particularly important, because the tumor is prone to metastasize (especially in the lung). The human osteosarcoma cell line was selected to determine the interaction of the CdTe QDs with human cancer cells [17].To improve the cancer detection and treatment effectiveness, researches on the cell lines with nanoparticles are conducted increasingly [9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

CdTe Quantum Dots and Their Bioconjugate with Human Serum Albumin for Fluorescence Imaging

Stolyarchuk¹,

Nowak²,

Polit³

et al. 2017

PCSS

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The interaction between CdTe quantum dots (QDs) with human serum albumin (HSA) and human cell culture was studied by optical spectroscopy technique. Performed research explored the interaction between the CdTe QDs and HSA, and fluorescence imaging efficiency of the QD-HSA bioconjugates in comparison with colloidal QDs. The secondary structure of the HSA is similar to the native form, which suggest a biocompatibility of prepared bionanocomplex. The CdTe QD-HSA bionanoconjugate shows chemical stability in phosphatebuffered saline (PBS) under ambient conditions, furthermore, it is stable in cytoplasm and suitable for cell labeling, tracking, and other bioimaging applications. The CdTe QDs located in an osteosarcoma cancer cells show a high luminescence intensity. The light emission of the CdTe QDs connected with albumin is less than the pure QDs, but it is still satisfactory, and additionally it is stable and have long photoluminescence lifetime. It suggest, that the CdTe NC-HSA bionanocomplex can be used as a fluorescent probe for cell labeling, tracking, and other bioimaging applications.

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Synthesis of aqueous CdTe quantum dots embedded silica nanoparticles and their applications as fluorescence probes

Cited by 108 publications

References 20 publications

A molecular imprinting-based turn-on Ratiometric fluorescence sensor for highly selective and sensitive detection of 2,4-dichlorophenoxyacetic acid (2,4-D)

A molecular imprinting-based turn-on Ratiometric fluorescence sensor for highly selective and sensitive detection of 2,4-dichlorophenoxyacetic acid (2,4-D)

Dummy Molecularly Imprinted Polymers-Capped CdTe Quantum Dots for the Fluorescent Sensing of 2,4,6-Trinitrotoluene

CdTe Quantum Dots and Their Bioconjugate with Human Serum Albumin for Fluorescence Imaging

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