Facile synthesis of water-soluble ZnS quantum dots with strong luminescent emission and biocompatibility

Zhang, Rui; Liu, Yingbo; Sun, Su-Qin

doi:10.1016/j.apsusc.2013.06.105

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…This has allowed the development of nanoparticles displaying novel properties such as composition, size and biocompatibility [[14]–[20]]. Biological protocols for the synthesis of TiO 2 nanoparticles have been developed, and the use of bacteria [[21]], yeasts [[22]], fungi [[23]] and plant extracts [[24]] have been recently reported (Table 1).…”

Section: Introductionmentioning

confidence: 99%

“…During the last years, NPs biosynthesis methods involving microorganisms [[ 10 ],[ 11 ]] or plant extracts [[ 12 ]], as well as eco-friendly chemical procedures involving low toxicity reagents and mild conditions of temperature and pressure, have taken hold [[ 13 ]]. This has allowed the development of nanoparticles displaying novel properties such as composition, size and biocompatibility [[ 14 ]–[ 20 ]]. Biological protocols for the synthesis of TiO 2 nanoparticles have been developed, and the use of bacteria [[ 21 ]], yeasts [[ 22 ]], fungi [[ 23 ]] and plant extracts [[ 24 ]] have been recently reported (Table 1 ).…”

Section: Introductionmentioning

confidence: 99%

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Use of titanium dioxide nanoparticles biosynthesized by Bacillus mycoides in quantum dot sensitized solar cells

Órdenes-Aenishanslins

Saona

Durán-Toro

et al. 2014

Microb Cell Fact

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BackgroundOne of the major challenges of nanotechnology during the last decade has been the development of new procedures to synthesize nanoparticles. In this context, biosynthetic methods have taken hold since they are simple, safe and eco-friendly.ResultsIn this study, we report the biosynthesis of TiO2 nanoparticles by an environmental isolate of Bacillus mycoides, a poorly described Gram-positive bacterium able to form colonies with novel morphologies. This isolate was able to produce TiO2 nanoparticles at 37°C in the presence of titanyl hydroxide. Biosynthesized nanoparticles have anatase polymorphic structure, spherical morphology, polydisperse size (40–60 nm) and an organic shell as determined by UV–vis spectroscopy, TEM, DLS and FTIR, respectively. Also, conversely to chemically produced nanoparticles, biosynthesized TiO2 do not display phototoxicity. In order to design less expensive and greener solar cells, biosynthesized nanoparticles were evaluated in Quantum Dot Sensitized Solar Cells (QDSSCs) and compared with chemically produced TiO2 nanoparticles. Solar cell parameters such as short circuit current density (ISC) and open circuit voltage (VOC) revealed that biosynthesized TiO2 nanoparticles can mobilize electrons in QDSSCs similarly than chemically produced TiO2.ConclusionsOur results indicate that bacterial extracellular production of TiO2 nanoparticles at low temperatures represents a novel alternative for the construction of green solar cells.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Use of titanium dioxide nanoparticles biosynthesized by Bacillus mycoides in quantum dot sensitized solar cells

Órdenes-Aenishanslins

Saona

Durán-Toro

et al. 2014

Microb Cell Fact

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“…42 As substâncias são incorporadas à superfície dos QDs, com o objetivo de garantir a estabilidade das partículas e evitar a degradação que, supostamente, libera íons ao ambiente em que o material é exposto. Os QDs podem ser planejados, de modo [49][50][51] Já os QDs de ZnO destacam-se, diante de outros materiais, pela sua alta energia de ligação do éxciton, de 60 meV à temperatura ambiente. Na fase massiva, as partículas têm um band gap próximo a 3,37 eV, absorção máxima em 360 nm com emissão perto de 520 nm, além de ótima estabilidade térmica e mecânica.…”

Section: Pontos Quânticos Ambientalmente Amigáveisunclassified

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

Sandri¹,

Krieger²,

Costa³

et al. 2017

Quim. Nova

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ENVIRONMENTALLY FRIENDLY QUANTUM DOTS: HIGHLIGHTING ZINC OXIDE. Semiconductor nanocrystals with sizes in the quantum confinement regime (2-10 nm) present special physical and chemical properties. Additionally, environment-friendly quantum dots (QDs), as zinc oxide and zinc sulfide, offer many practical usages. Herein the ZnO semiconductor nanocrystals properties will be preferentially explored, such as its luminescence, broad spectrum UV absorber and electronics performances, and therefore its multifunctionality, as well as its advantages compared to some toxics QDs. A review is carefully presented stressing some synthesis approaches for applications reasons toward devices, chemosensors, biological labels, UV-absorbers and photocatalysis. ZnO QDs have been used in combination with organic and other inorganic materials. Hybrid materials have many advantages compared to their individual contents leading to important contributions to science and technology. As a result, an important growth in material fields is noticeable.Keywords: ZnO quantum dots; environment-friendly quantum dots; photocatalysis; UV-blockers; size-dependent fluorescence emission. INTRODUÇÃOÉ notória a contribuição da nanotecnologia nas ciências biológi-cas, farmacêuticas e da saúde nestas últimas três décadas. Como resultado, tem-se observado uma oferta cada vez maior de novos materiais, inteligentes e funcionais, o melhoramento da qualidade de vida das pessoas e, consequentemente, um aumento na expectativa de vida. 1No início da década de 1980 apareceram os primeiros estudos para uma nova classe de nanocristais com capacidade de exibir propriedades espectroscópicas dependentes do tamanho, 2 advindas do efeito de confinamento quântico.3-5 O confinamento quântico é resultado da mudança da densidade dos estados eletrônicos, que por sua vez, está relacionada com a posição e momento para partículas livres e confinadas. Quando a energia e o momento são definidos, a posição destas partículas não pode ser definida com precisão. Se considerada a relação entre energia e momento para a fase sólida massiva, é como pensar que uma série de vibrações que ocorrem com pequenas diferenças de energia nesta fase serão comprimidas, gerando uma transição intensa e única em um ponto quântico (QD, do inglês quantum dot).5 Dita de outra maneira, com a redução do tamanho das partículas a excitação eletrônica é deslocada para regiões de maior energia e o oscilador fica com restrita capacidade de transição. A Figura 1 ilustra a densidade de estados partindo de um material massivo, tridimensional (a) e que, progressivamente, sofre o confinamento em uma das dimensões (b)-(d). 5QDs podem confinar transportadores de cargas e manter uma coerência de spin destes transportadores em um período de tempo maior que os correspondentes materiais massivos, característica essa fundamental para o desenvolvimento de tecnologia baseada em sistemas quânticos 6 e da manifestação de efeitos excitônicos expressivos, os quais dependem da forma e tamanho da estrutura de confinamento. 7A incidênc...

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“…However, experimental results indicate that any leakage of cadmium from the nanocrystals would be toxic and fatal to biological system [10][11][12]. For these reasons, numerous researches are currently conducted to develop Q-dots without any heavy-metal ions [13][14][15]. A new class of potential fluorescence material-doped semiconductor nanocrystals (D-dots), which are based on transition-metal-ion-doped D-dots without heavy-metal ions, can overcome the toxicity problems of traditional Q-dots mentioned above.…”

Section: Introductionmentioning

confidence: 99%

Studies of the interaction of CS@ZnS:Mn with bovine serum albumin under illumination

Liu

Xiao

2015

Applied Surface Science

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Facile synthesis of water-soluble ZnS quantum dots with strong luminescent emission and biocompatibility

Cited by 12 publications

References 23 publications

Use of titanium dioxide nanoparticles biosynthesized by Bacillus mycoides in quantum dot sensitized solar cells

Use of titanium dioxide nanoparticles biosynthesized by Bacillus mycoides in quantum dot sensitized solar cells

Pontos quânticos ambientalmente amigáveis: destaque para o óxido de zinco

Studies of the interaction of CS@ZnS:Mn with bovine serum albumin under illumination

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