Facile Sonochemical Synthesis of Highly Luminescent ZnS−Shelled CdSe Quantum Dots

Murcia, Michael J.; Shaw, David L.; Woodruff, Heather; Naumann, Christoph; Young, A.; Long, Eric C.

doi:10.1021/cm0505547

Cited by 82 publications

(61 citation statements)

References 42 publications

(110 reference statements)

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“…In their recent report, Young and coworkers highlighted several advantages of a sonochemical procedure over thermal synthesis: better control over growth rate of nanocrystals via ultrasonic intensity and significantly lower reaction temperatures. [97] CdSe/ZnS core/shell quantum dots prepared by a two-step sonochemical process exhibit high photoluminescence, with quantum efficiencies of 50-60% and a narrow size distribution of $10%. This facile synthetic route provides an alternative way for the large-scale synthesis of highly luminescent semiconductor nanoparticles.…”

Section: Metal Chalcogenides and Carbidesmentioning

confidence: 99%

Applications of Ultrasound to the Synthesis of Nanostructured Materials

2010

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Recent advances in nanostructured materials have been led by the development of new synthetic methods that provide control over size, morphology, and nano/microstructure. The utilization of high intensity ultrasound offers a facile, versatile synthetic tool for nanostructured materials that are often unavailable by conventional methods. The primary physical phenomena associated with ultrasound that are relevant to materials synthesis are cavitation and nebulization. Acoustic cavitation (the formation, growth, and implosive collapse of bubbles in a liquid) creates extreme conditions inside the collapsing bubble and serves as the origin of most sonochemical phenomena in liquids or liquid-solid slurries. Nebulization (the creation of mist from ultrasound passing through a liquid and impinging on a liquid-gas interface) is the basis for ultrasonic spray pyrolysis (USP) with subsequent reactions occurring in the heated droplets of the mist. In both cases, we have examples of phase-separated attoliter microreactors: for sonochemistry, it is a hot gas inside bubbles isolated from one another in a liquid, while for USP it is hot droplets isolated from one another in a gas. Cavitation-induced sonochemistry provides a unique interaction between energy and matter, with hot spots inside the bubbles of approximately 5000 K, pressures of approximately 1000 bar, heating and cooling rates of >10(10) K s(-1); these extraordinary conditions permit access to a range of chemical reaction space normally not accessible, which allows for the synthesis of a wide variety of unusual nanostructured materials. Complementary to cavitational chemistry, the microdroplet reactors created by USP facilitate the formation of a wide range of nanocomposites. In this review, we summarize the fundamental principles of both synthetic methods and recent development in the applications of ultrasound in nanostructured materials synthesis.

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Section: Metal Chalcogenides and Carbidesmentioning

confidence: 99%

Applications of Ultrasound to the Synthesis of Nanostructured Materials

2010

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“…Although the current work is focused on ZnS, we believe that a similar approach is applicable to other metal chalcogenide materials such as ZnSe, [15] PbS, [16] PbSe, [17] PbTe, [18] CdS, [19] CdSe, [20] CuS, [21] NiS, [21] MoS, [22] Ag 2 S, [23] among others, since such materials can also be prepared by the sonochemical method, whereas the precursors probably have a strong interaction with the cell surfaces under ultrasound. As a result, it is probably a general and straightforward route to synthesize various metal chalcogenide semiconductors of ordered porous meso/nanostructures based on diatom frustules.…”

Section: Resultsmentioning

confidence: 99%

Bio‐Inspired Bottom‐Up Assembly of Diatom‐Templated Ordered Porous Metal Chalcogenide Meso/Nanostructures

Zhou

Fan

et al. 2008

Eur J Inorg Chem

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We put forward a novel and straightforward sonochemical process as a generic bottom-up assembly routeto produce ordered porous metal chalcogenide meso/nanostructures by templating of diatom frustules. We work with one of the most beautiful species of diatoms, Coscinodiscus lineatus, as a representative of diatoms with central symmetry, and with ZnS as the prototype, as it is a high refractive index material and is a typical material widely used in optics and photonics. ZnS replicas have been successfully synthesized from the interaction between the reactive surfaces of the frustules and the precursors under ultrasound. The inorganic replicas copy the morphology of the ordered porous structure and inherit its optical property, such as the existence of the photonic bandgap of the diatom frustules. It is possible to achieve tunable photonic properties in the replicas by assembly of various metal chalcogenide semiconductors of different refractive indexes. This bio-inspired discovery provides insight into the facile synthesis of elaborate meso/nanostructures from these marine microbes. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)National Natural Science Foundation of China [50401005, 50671065]; Program for New Century Excellent Talents in university [NCET-04-0387]; Major Fundamental Research Project of Shanghai Science and Technology Committee [07DJ14001]; National Basic Research Program of China [2006CB601200

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“…39,40 Este método tem sido também investigado para revestir QD de CdSe com ZnS ou CdS, quer por decomposição térmica do complexo de ditiocarbamato do respectivo metal 41 ou por sonólise de xantatos metálicos. 42 Um avanço importante na síntese de QD por adaptação do mé-todo TOPO original foi feito por Peng e Peng, no decorrer do estudo do mecanismo de formação de nanocristais semicondutores. 46 Estes investigadores observaram que a introdução de um ligante que se coordene fortemente ao metal na mistura reacional, como é o caso dos ácidos fosfónico, hexilfosfónico (HPA) ou tetradecilfosfónico (TDPA), o Cd(CH 3 ) 2 converte-se rapidamente num complexo de Cd(II) com HPA/TDPA, que funciona como precursor contendo cád-mio.…”

Section: Síntese De Np Semicondutoras -Qdunclassified

Os nanomateriais e a descoberta de novos mundos na bancada do químico

Martins¹,

Trindade²

2012

Quím. Nova

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Recebido em 3/10/11; aceito em 17/2/12; publicado na web em 15/6/12 NANOMATERIALS AND THE DISCOVERY OF NEW WORLDS AT THE CHEMIST'S BENCH. In recent years there has been great progress in the field of nanotechnology largely driven by research into nanomaterials. Chemistry appears in this context for its relevant role in the synthesis and surface modification of nanomaterials. This review article discusses fundamental concepts related to the synthesis and properties of inorganic nanoparticles with diverse properties. Aspects related to unique size dependent optical and magnetic properties are discussed and the chemistry involved in the preparation of nanomaterials reviewed. Fundamental aspects of the chemical modification of nanoparticles envisaging potential applications for these materials are also addressed.Keywords: nanoparticles; chemical synthesis; surface modification. INTRODUÇÃOAs últimas décadas assistiram a um interesse sem precedentes na área das Nanotecnologias e Nanociências, tratando-se atualmente de um dos domínios tecnológicos mais atrativos e de maior crescimento. A "revolução nano", comparada por muitos especialistas à revolução industrial do século XIX, promete produtos inovadores em áreas estratégicas como, por exemplo, a de energia, medicina, informação, segurança, ambiente e indústria.A palestra de Richard Feynman na reunião anual da Sociedade Americana de Física, no Instituto de Tecnologia da Califórnia (Caltech), em 1959, é um marco histórico e científico ao antecipar desenvolvimentos em Nanotecnologia, sem que este termo tenha sido utilizado na ocasião.1 Nessa palestra, intitulada There's Plenty of Room at the Bottom, referiu-se à possibilidade de manipular a matéria à escala atómica e molecular e discutiram-se consequências em termos de progresso científico nesse novo contexto. As previsões de Feynman incluíram a miniaturização de dispositivos de armazenamento de informação e o desenvolvimento de microscópios com poder de resolução ao nível atómico. Contudo, a Nanotecnologia resulta efetivamente da sedimentação de conhecimento científico em áreas diversas, e para a qual contribuíram decisivamente avanços tecnológicos recentes, nomeadamente a descoberta e o aperfeiçoamento de microscópios que permitem a caracterização de nanoestruturas, métodos computacionais mais poderosos e novas técnicas de síntese em nanomateriais.A invenção do microscópio de efeito túnel (Scanning Tunelling Microscope, STM), cuja patente é de 1980, deu a Gerd Binnig e Heinrich Rohrer o prémio Nobel da Física, em 1986. No STM é aplicada uma diferença de potencial entre a superfície da amostra e uma sonda muito fina que se aproxima da superfície do material a analisar, a uma distância atómica, originando uma corrente por efeito de túnel entre a ponta da sonda e a superfície. Uma modalidade de medição no STM faz com que a sonda seja deslocada ao longo da superfície (plano XY) de forma a varrer uma determinada área da amostra, mantendo a intensidade de corrente constante entre a ponta e a superfície. O ajuste da posição v...

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Facile Sonochemical Synthesis of Highly Luminescent ZnS−Shelled CdSe Quantum Dots

Cited by 82 publications

References 42 publications

Applications of Ultrasound to the Synthesis of Nanostructured Materials

Applications of Ultrasound to the Synthesis of Nanostructured Materials

Bio‐Inspired Bottom‐Up Assembly of Diatom‐Templated Ordered Porous Metal Chalcogenide Meso/Nanostructures

Os nanomateriais e a descoberta de novos mundos na bancada do químico

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