Surface and Interface Chemistry in Colloidal Quantum Dots for Solar Applications Studied by X‐Ray Photoelectron Spectroscopy

Clark, Pip C. J.; Flavell, Wendy R.

doi:10.1002/tcr.201800085

Cited by 17 publications

(11 citation statements)

References 65 publications

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“…As described above, because of their small size, QDs have a high surface-to-volume ratio; thus, many of their properties are surface chemistry-dependent [ 171 ]. Hence, surface analysis techniques are of high interest, and X-ray photoelectron spectroscopy (XPS) is deserving of particular mention.…”

Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

“…Hence, surface analysis techniques are of high interest, and X-ray photoelectron spectroscopy (XPS) is deserving of particular mention. In fact, the literature shows that XPS has been the technique of choice for the analysis of the surface of a variety of QDs [ 8 , 171 , 172 , 173 , 174 , 175 , 176 , 177 ], although as previously mentioned, authors often combine XPS and other techniques with characterization purposes.…”

Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

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Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

et al. 2022

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Since the discovery of Quantum Dots (QDs) by Alexey I. Ekimov in 1981, the interest of researchers in that particular type of nanomaterials (NMs) with unique optical and electrical properties has been increasing year by year. Thus, since 2009, the number of scientific articles published on this topic has not been less than a thousand a year. The increasing use of QDs due to their biomedical, pharmaceutical, biological, photovoltaics or computing applications, as well as many other high-tech uses such as for displays and solid-state lighting (SSL), has given rise to a considerable number of studies about its potential toxicity. However, there are a really low number of reported studies on the detection and quantification of QDs, and these include ICP–MS and electrochemical analysis, which are the most common quantification techniques employed for this purpose. The knowledge of chemical phenomena occurring on the surface of QDs is crucial for understanding the interactions of QDs with species dissolved in the dispersion medium, while it paves the way for a widespread use of chemosensors to facilitate its detection. Keeping in mind both human health and environmental risks of QDs as well as the scarcity of analytical techniques and methodological approaches for their detection, the adaptation of existing techniques and methods used with other NMs appears necessary. In order to provide a multidisciplinary perspective on QD detection, this review focused on three interrelated key aspects of QDs: properties, surface chemistry and detection.

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Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

Section: Surface Chemistry Of Qdsmentioning

confidence: 99%

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

et al. 2022

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“…This technique has been successfully used to study ion exchange occurring at the surface of metal NCs as small as 3 nm in diameter . When used in conjunction with other characterization techniques, such as those that can determine precise NC diameter, SR-XPS can provide information about the ligand shell and the number of unpassivated surface sites . This would be incredibly useful information for understanding the evolving NC surface during synthesis.…”

Section: Characterization Of Nc Surfacesmentioning

confidence: 99%

“…63 When used in conjunction with other characterization techniques, such as those that can determine precise NC diameter, SR-XPS can provide information about the ligand shell and the number of unpassivated surface sites. 64 This would be incredibly useful information for understanding the evolving NC surface during synthesis. In situ SR-XPS has already provided insight into perovskite interfaces; measurements during the thermal deposition of Al onto a perovskite film revealed the migration of Al ions into the perovskite lattice and multiple resulting chemical reactions.…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 99%

Just Scratching the Surface: In Situ and Surface-Specific Characterization of Perovskite Nanocrystal Growth

Sadighian

Wong

2021

J. Phys. Chem. C

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The model of nucleation and growth proposed by LaMer has guided our understanding of nanocrystal (NC) formation for over 70 years. However, LaMer’s model does not account for the effects of surface–ligand interactions on the availability of precursor, the resulting burst nucleation, or the growth of the NC. These interactions play a critical role in determining the electronic properties and physical structure of perovskite NCs. The surfaces of perovskite NCs are dynamic, with multiple processes occurring simultaneously, such as the adsorption and desorption of ligands and growth via incorporation of precursor or oriented attachment of small crystallites. These unstable surfaces are difficult to characterize during growth. A model of NC growth that includes the behavior and impact of ligands at the NC surface would enhance rational syntheses of perovskite nanomaterials with targeted properties. Here we discuss techniques and strategies that have provided insight into the nature of NC surfaces, emphasizing the need for new, multimodal, in situ measurements to characterize the role of surface ligands during perovskite NC growth.

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“…Magnesium Klorida (101) Magnesium klorida ialah padatan yang umumnya merupakan senyawa garam yang berasal dari asam dan basa kuat, senyawa ini termasuk kedalam senyawa halida ionik yang mudah larut didalam pelarut air, dan biasanya senyawa ini tersedia didalam senyawa hidrat. Senyawa magnesium (102)(103)(104)(105) klorida memiliki sifat fisika dan sifat kimia yaitu diantaranya:…”

Section: Hasil Dan Pembahasan 31 Sifat Senyawa Mgclunclassified

Magnesium Klorida (MgCl2): Karakteristik dan Dinamika Molekuler Pada MgCl2

Wildayati¹,

Zainul²

2019

Preprint

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Magnesium klorida adalah salah satu senyawa kimia dengan rumus MgCl2 dan bentuk hidrat MgCl2.H2O. Magnesium klorida merupakan logam yang kuat, memiliki titik didih 714°C dan titik lebur 1412 °C mampu larut dalam air, serta memiliki sifat thermodinamika seperti∆Hf 298 sebesar-641,3kj/mol dan∆Gf 298 sebesar -591,8 kj/mol. Senyawa ini dapat diperoleh dengan proses kristalisasi dan elektrolisis atau dari reaksi Mg(OH)2 dengan HCl. Magnesium klorida merupakan salah satu garam yang memiliki peranan penting pada industri kimia dan banyak kegunaan dalam kehidupan sehari-hari seperti de-icer, liquid tirest ballast, foam pada instalasi kebakaran. Penelitian ini bertujuan untuk mengetahui karakteristik molekul, dan menganalisis dinamika molekuler serta transport ion pada MgCl2 . Metode yang digunakan adalah metode optimasi dilakukan dengan menggunakan aplikasi Chemoffice3D 15.0 dan ChemDraw Profesional 15.0. Dilihat dari penggambaran chemoffice 15.0 senyawa MgCl2 memiliki karakterisasi transfor ionik yang dapat diukur dari parameter mobilitas ion. Konduktivitas viskositas, dan gerakan hanyut.?Dari?parameter?yang diukur diperoleh?nilai perhitungan kecepatan hanyut Magnesium Klorida (MgCl2) dengan potensial 3,61 V dan jarak antara elektroda adalah 1,5 cm adalah 2, 407 V/ cm.

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Surface and Interface Chemistry in Colloidal Quantum Dots for Solar Applications Studied by X‐Ray Photoelectron Spectroscopy

Cited by 17 publications

References 65 publications

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

Semiconductor Quantum Dots as Target Analytes: Properties, Surface Chemistry and Detection

Just Scratching the Surface: In Situ and Surface-Specific Characterization of Perovskite Nanocrystal Growth

Magnesium Klorida (MgCl2): Karakteristik dan Dinamika Molekuler Pada MgCl2

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