Peer Reviewed: Optical Sensing with Quantum Dots

Murphy, Catherine J.

doi:10.1021/ac022124v

Cited by 461 publications

(168 citation statements)

References 62 publications

(90 reference statements)

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“…Next generation markers, which are based on II-VI or III-V semiconductor nanocrystals (NCs), demonstrates significant advantages over the organic dyes [1,2]. Their broad excitation spectrum and narrow emission bands are favorable for the development of biological assays with multiplex detection.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence of Si nanocrystals under selective excitation

Dobrovolskas

Mickevičius

Тамулайтис

et al. 2009

Journal of Physics and Chemistry of Solids

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Photoluminescence of Si nanocrystals passivated by different alkanes (hexane, octane, and tridecane) was studied at room temperature. It is shown that the emission band shape is not affected by the length of the carbon chain in the alkanes used for passivation. A pronounced fine structure of the photoluminescence band consisting of peaks separated by 150-160 meV was observed under resonant excitation. The structure is interpreted by predominant contribution from Si nanocrystal groups with particular stable size/shape existing in addition to the previously reported nanocrystals with "magic" numbers of Si atoms. The contribution of these stable nanocrystals is revealed using selective resonant photoexcitation to the higher energy states in the discrete energy spectrum of such nanocrystals.

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Section: Introductionmentioning

confidence: 99%

Photoluminescence of Si nanocrystals under selective excitation

Dobrovolskas

Mickevičius

Тамулайтис

et al. 2009

Journal of Physics and Chemistry of Solids

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“…[13][14][15][16] Metal/cyanine dye hybrid nanostructures are particularly suitable for studying plasmon-exciton interactions in core-shell geometries, due to the relative ease with which the plasmonic nanoparticle morphology and size may be tuned to ensure the overlap of plasmon and exciton resonances. Significant progress in the fabrication and control over the morphology of plasmonic gold and silver nanoparticles has been made in recent years.…”

mentioning

confidence: 99%

Coherent Plasmon-Exciton Coupling in Silver Platelet-J-aggregate Nanocomposites

Miller²,

et al. 2015

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Hybrid nanostructures that couple plasmon and exciton resonances generate hybridized energy states, called plexcitons, which may result in unusual light-matter interactions. We report the formation of a transparency dip in the visible spectra of colloidal suspensions containing silver nanoplatelets and a cyanine dye, 1,1′-diethyl-2,2′-cyanine iodide (PIC). PIC was electrostatically adsorbed onto the surface of silver nanoplatelet core particles, forming an outer J-aggregate shell. This core−shell architecture provided a framework for coupling the plasmon resonance of the silver nanoplatelet core with the exciton resonance of the J-aggregate shell. The sizes and aspect ratios of the silver nanoplatelets were controlled to ensure the overlap of the plasmon and exciton resonances. As a measure of the plasmon-exciton coupling strength in the system, the experimentally observed transparency dips correspond to a Rabi splitting energy of 207 meV, among the highest reported for colloidal nanoparticles. The optical properties of the silver platelet-J-aggregate nanocomposites were supported numerically and analytically by the boundary-element method and temporal coupled-mode theory, respectively. Our theoretical predictions and experimental results confirm the presence of a transparency dip for the silver nanoplatelet core Jaggregate shell structures. Additionally, the numerical and analytical calculations indicate that the observed transparencies are dominated by the coupling of absorptive resonances, as opposed to the coupling of scattering resonances. Hence, we describe the suppressed extinction in this study as an induced transparency rather than a Fano resonance.

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“…Thus the selective determination of an analyte can be achieved via interaction with functionalized QD or non-functionalized QD. [22][23][24][25] QDs have been widely used as biosensors in biotechnology. [24][25][26][27] Recently, a few applications of QDs for the determination of urea appeared in the literature.…”

Section: Introductionmentioning

confidence: 99%

Use of Water Soluble and Phosphorescent MPA Capped CdTe Quantum Dots for Detection of Urea

Oymak

Ertaş

Tamer

2018

tjps

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ÖZAmaç: Bu çalışmada 3-MPA kaplı CdTe kullanılarak üre tayini için yöntem geliştirilmiştir. Gereç ve Yöntemler: Yöntem üreaz enzimi ile ürenin reaksiyonu sonucu üretilen amonyağın ortam pH'sini değiştirmesi esasına dayanmaktadır. MPA kaplı CdTe'nin fosforesans sinyali pH 2.5-5.0 arasında üre konsantrasyonuyla doğrusal olarak artmaktadır. Optimum koşullar altında doğrusal aralık 0.016-0.16 mM (1-10 mg/L) gözlenebilme sınırı 3 s/b formülüne göre 0.003 mM (0.17 mg/L) olarak hesaplanmıştır. Bağıl standart sapma, 4 mg/L üre konsantrasyonunda %3.4 olarak hesaplanmıştır (n=7). Bulgular: Yöntem serum numunesine başarılı bir şekilde uygulanmıştır. Aynı serum numuneleri bağımsız bir laboratuvar tarafından analiz edilmiş ve sonuçlarda %95 güven aralığında istatistiki fark görülmemiştir (F testi). Sonuç: Önerilen yöntem serumda üre tayini için, örnek ön hazırlığına ihtiyaç duymayan, basit, seçici ve düşük maliyetlidir. Anahtar kelimeler: Fosforesan kuantum noktacık, MPA kaplı CdTe, üre Objectives: To describe a method for the determination of urea in blood serum using urease enzyme and 3-MPA-capped CdTe quantum dots. Materials and Methods:The method is based on the increase in pH of the solution as a result of the reaction between urea and urease, which causes an increase in the phosphorescence signal of MPA-CdTe quantum dots in the pH range of 2.5-5.0. Under the optimum conditions, the linear range of urea was 0.016-0.16 mM (1-10 mg/L) and the limit of detection based on 3 s/b was calculated as 0.003 mM (0.17 mg/L). The relative standard deviation was calculated as 3.4% at 4 mg/L urea concentration (n=7). Results:The method was applied to human serum samples. The same samples were analyzed by an independent laboratory and the results were not statistically different, at 95% confidence level (F test). Conclusion:The proposed method does not need sample pretreatment, is simple, selective, and cost-effective for the determination of urea in serum samples.

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Peer Reviewed: Optical Sensing with Quantum Dots

Cited by 461 publications

References 62 publications

Photoluminescence of Si nanocrystals under selective excitation

Photoluminescence of Si nanocrystals under selective excitation

Coherent Plasmon-Exciton Coupling in Silver Platelet-J-aggregate Nanocomposites

Use of Water Soluble and Phosphorescent MPA Capped CdTe Quantum Dots for Detection of Urea

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