Preparation of CdS Nanoparticles by First-Year Undergraduates

Winkelmann, Kurt; Noviello, Thomas; Brooks, Stephen

doi:10.1021/ed084p709

Cited by 36 publications

(24 citation statements)

References 6 publications

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“…Using this relation, the absorption edge is calculated from the intersection of the sharply decreasing region of the spectrum with the baseline [ 41 ]. We applied the Brus equation to the CdS and ZnS samples using the following parameters: ZnS ( m e * = 0.42 m 0 , m h * = 0.61 m 0 ) [ 44 ], CdS ( m e * = 0.21 m 0 , m h * = 0.80 m 0 ), where m 0 is the mass of electron [ 45 ]. The estimated particles sizes are 4.82 and 3.54 nm for CdS and ZnS samples respectively.…”

Section: Resultsmentioning

confidence: 99%

ZnS, CdS and HgS Nanoparticles via Alkyl-Phenyl Dithiocarbamate Complexes as Single Source Precursors

Onwudiwe

Ajibade

2011

IJMS

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The synthesis of II-VI semiconductor nanoparticles obtained by the thermolysis of certain group 12 metal complexes as precursors is reported. Thermogravimetric analysis of the single source precursors showed sharp decomposition leading to their respective metal sulfides. The structural and optical properties of the prepared nanoparticles were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) UV-Vis and photoluminescence spectroscopy. The X-ray diffraction pattern showed that the prepared ZnS nanoparticles have a cubic sphalerite structure; the CdS indicates a hexagonal phase and the HgS show the presence of metacinnabar phase. The TEM image demonstrates that the ZnS nanoparticles are dot-shaped, the CdS and the HgS clearly showed a rice and spherical morphology respectively. The UV-Vis spectra exhibited a blue-shift with respect to that of the bulk samples which is attributed to the quantum size effect. The band gap of the samples have been calculated from absorption spectra and werefound to be about 4.33 eV (286 nm), 2.91 eV (426 nm) and 4.27 eV (290 nm) for the ZnS, CdS and HgS samples respectively.

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Section: Resultsmentioning

confidence: 99%

ZnS, CdS and HgS Nanoparticles via Alkyl-Phenyl Dithiocarbamate Complexes as Single Source Precursors

Onwudiwe

Ajibade

2011

IJMS

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“…Pode-se encontrar na literatura alguns exemplos de adequações de experimentos de síntese de nanopartículas para o ensino em cursos de graduação e diversos materiais são utilizados, tais como: prata, ouro ou sulfeto de cádmio (Winkelmann, Noviello, & Brooks, 2007;Dorney, Baker, Edwards, Kanel, O'Malley, & Pavel-Sizemore, 2014;Orbaek, McHale, McHale, & Barron, 2015). Muitos esforços têm sido feitos para viabilização da preparação de nanopartículas de magnetita (-Fe2O3), incluindo a coprecipitação (Andrade, Souza, Pereira, Fabris, & Domingues, 2010) as microemulsões (Fernandez, & Kawachi, 2010), a decomposição de precursores orgânicos em temperatura elevada (Dumestre, Martinez, Zitoun, Fromem, Casanove, Lecante, Respaund, Serres, Benfield, Amiens, & Chaudret, 2004) e a oxidação de magnetita (Wang, Wei, & Qu, 2013).…”

Section: A Experimentação Com Nanopartículasunclassified

Síntese e caracterização de nanopartículas de óxido de ferro: Uma proposta de atividade experimental

Lavayen

Raupp

Schissler

et al. 2021

RSD

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Este trabalho objetiva apresentar uma metodologia para síntese e caracterização de nanopartículas de óxido de ferro como ferramenta na abordagem de conceitos científicos acerca de nanomateriais para o ensino superior. A justificativa para a inserção de tal atividade experimental nas aulas práticas de química deve-se à revolução que vem ocorrendo pelo desenvolvimento de materiais e dispositivos em escala nanométrica e por seu vasto campo de aplicação. Mais especificamente, as nanopartículas magnéticas têm importância para diversas áreas, pois apresentam potencial de melhoria nas tecnologias de produção, de materiais eletrônicos, no setor de telecomunicações, na biomedicina, na remediação do meio ambiente, entre outros. Utilizando insumos com baixo nível de toxicidade, de fácil acesso e baixo custo, a metodologia proposta usa técnicas de fácil manipulação para obtenção das nanopartículas, bem como ensaios acessíveis para caracterização. Como resultado espera-se que a inserção desta atividade permita a discussão dos conceitos científicos, tecnológicos e sociais relacionados aos nanomateriais, bem como a compreensão do método de precipitação para síntese de nanopartículas, e dos ensaios analíticos para caracterização. Espera-se que esta atividade promova a introdução a conceitos básicos da nanociência e da nanotecnologia, que se fazem presentes no mundo contemporâneo, e que devem ser trazidos para a sala de aula.

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“…The bulk ZnS particles formed by mixing solutions A and B together to form a slightly cloudy white solution. The white color indicated the formation of ZnS nanoparticles (Kurt Winkelmann et al, 2007).…”

Section: Synthesismentioning

confidence: 99%

Novel method to synthesize and characterize Zinc Sulfide nanoparticles

Thangam¹,

Anitha²,

Kavitha³

2012

IJASER

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Zinc sulfide nanoparticles were fabricated by solvent evaporation method with and without using capping agent, Hexa decyltrimethyl ammonium bromide (CTAB) at room temperature. The product was received in powder form. The structure and composition of the resultant product was characterized by means of UV and FTIR spectrophotometric studies. FTIR analysis showed peaks at 352.02 cm-1 and 611.46 cm-1 for Zinc Sulfide with CTAB, corresponding to Zinc and Sulfide stretching. For Zinc Sulfide without CTAB, the same stretching frequencies were observed at 315.10 cm-1 and 615.32 cm-1. UV spectrophotometer study determined the band gap of nanocrystalline Zinc Sulfide (with and without CTAB) as 5.48 eV and 5.99 eV, respectively. The optical absorption edge exhibited a blue shift with respect to that of the bulk sample. The blue shift with the decrease in crystalline size was attributed to the quantum size effects. When ZnS was prepared without CTAB, there was decrease in the size of the nanoparticle than when it was prepared with CTAB. Even though no capping agent (CTAB) was used in preparing ZnS, the particle size was well reduced. It was achieved by stirring the solutions during preparation. No agglomeration of nanoparticles was detected

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Preparation of CdS Nanoparticles by First-Year Undergraduates

Cited by 36 publications

References 6 publications

ZnS, CdS and HgS Nanoparticles via Alkyl-Phenyl Dithiocarbamate Complexes as Single Source Precursors

ZnS, CdS and HgS Nanoparticles via Alkyl-Phenyl Dithiocarbamate Complexes as Single Source Precursors

Síntese e caracterização de nanopartículas de óxido de ferro: Uma proposta de atividade experimental

Novel method to synthesize and characterize Zinc Sulfide nanoparticles

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