Study of the Optical Properties of CdZnSe/ZnS-Quantum Dot–Au-Nanoparticle Complexes

Volgina, Dominika-Olga A.; Stepanidenko, Evgeniia A.; Kormilina, T. K.; Cherevkov, Sergei A.; Dubavik, Aliaksei; Baranov, M. A.; Litvin, Aleksandr P.; Fedorov, Anatoly V.; Takai, Kazuyuki; Samokhvalov, Pavel; Nabiev, Igor; Ushakova, Elena V.

doi:10.1134/s0030400x18040185

Cited by 6 publications

(2 citation statements)

References 29 publications

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“…2 is the enhancement factor of the exciting optical field which measures the enhancement effect of the local electromagnetic field when the molecule is in the vicinity of the metal structure. [18][19][20] k det is the efficiency of the optical detection, and Q is the fluorescent quantum efficiency. In most cases, when the optical detection system and the experimental research system are selected, it can be approximated that the light detection efficiency k det is determined.…”

Section: Experiments and Resultsmentioning

confidence: 99%

Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution*

et al. 2019

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We investigated the optical properties of hybrid exciton–plasmon coupling ensembles composed of ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution. We modulated their average interval by changing the ratio of quantum dots and Ag nanoparticles. The transition from dramatic PL enhancement to PL quenching state was experimentally observed, according to the continuous decrease of the PL lifetime. The PL enhancement rate exceeded 10, with the Purcell factor of 3.5. Meanwhile, the proportion of fast decay increased from 0.3 to 0.6, corresponding to the proportion of slow decay decreased from 0.7 to 0.4. Our experiment is important for the hybrid exciton–plasmon coupling system to be practicable in optoelectronic application.

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Section: Experiments and Resultsmentioning

confidence: 99%

Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution*

et al. 2019

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“…Graphene, titanium, or silicon oxides, molybdenum disulfide, metal nanoparticles, and composites are candidate material systems [ 29 , 30 , 31 ]. However, metal nanoparticles remain the main material for the preparation of SERS substrates, largely since they allow the possibility of modifying the particle surface [ 32 ]. There are various ways to obtain metal nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Formation of Gold Nanoparticle Self-Assembling Films in Various Polymer Matrices for SERS Substrates

et al. 2022

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Surface-enhanced Raman spectroscopy (SERS) is regarded as a versatile tool for studying the composition and structure of matter. This work has studied the preparation of a SERS substrate based on a self-assembling plasmonic nanoparticle film (SPF) in a polymer matrix. Several synthesis parameters for the SPF are investigated, including the size of the particles making up the film and the concentration and type of the self-assembling agent. The result of testing systems with different characteristics is discussed using a model substance (pseudoisocyanin iodide). These models can be useful in the study of biology and chemistry. Research results contain the optimal parameters for SPF synthesis, maximizing the SERS signal. The optimal procedure for SPF assembly is determined and used for the synthesis of composite SPFs within different polymer matrices. SPF in a polymer matrix is necessary for the routine use of the SERS substrate for various types of analytes, including solid samples or those sensitive to contamination. Polystyrene, polyvinyl alcohol (PVA), and polyethylene are investigated to obtain a polymer matrix for SPF, and various methods of incorporating SPF into a polymer matrix are being explored. It is found that films with the best signal enhancement and reproducibility were obtained in polystyrene. The minimum detectable concentration for the SERS substrate obtained is equal to 10−10 M. We prepared a SERS substrate with an analytical enhancement factor of 2.7 × 104, allowing an increase in the detection sensitivity of analyte solutions of five orders of magnitude.

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Synthesis and Biological Use of Nanomaterials

Hatipoglu

Sut

2022

Topics in Applied Physics

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Study of the Optical Properties of CdZnSe/ZnS-Quantum Dot–Au-Nanoparticle Complexes

Cited by 6 publications

References 29 publications

Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution*

Large-scale control of enhancement and quenching of photoluminescence for ZnSe/ZnS quantum dots and Ag nanoparticles in aqueous solution*

Formation of Gold Nanoparticle Self-Assembling Films in Various Polymer Matrices for SERS Substrates

Synthesis and Biological Use of Nanomaterials

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