Characterization of PbS with different morphologies produced using a cyclic microwave radiation

Phuruangrat, Anukorn; Thongtem, Titipun; Thongtem, Somchai

doi:10.1016/j.apsusc.2008.01.059

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…Further, MW-assisted synthesis helps to increase the product yields and enhance the product purity compared to other synthesis methods . However, in the case of PbS, so far, MW irradiation has only been used to synthesize microsized crystals of various morphologies − and deposit PbS thin films via chemical bath deposition. , Further, these reported MW-assisted synthesis routes require relatively higher MW power (650 W or more) and longer processing times of 20 min or more. , Until now, a facile and rapid synthesis of uniform-sized sub 10 nm PbS NCs by a MW-assisted method remains a challenge and is the reason why MW-synthesized PbS has not been successfully employed for optoelectronics applications yet.…”

Section: Introductionmentioning

confidence: 99%

Microwave-Polyol Synthesis of Sub-10-nm PbS Nanocrystals for Metal Oxide/Nanocrystal Heterojunction Photodetectors

Paliwal

Singh

Sharma

et al. 2018

ACS Appl. Nano Mater.

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A rapid microwave-polyol technique is developed to grow bare-surface sub-10-nm lead sulfide (PbS) colloidal nanocrystals (NCs) of uniform size. Growth involves three distinct dynamical stages. PbS NCs homogeneously nucleate and undergo a fast growth process that spontaneously aggregates them into a continuous microstructure of PbS. Next, the interaction of low-power microwave irradiation with the NCs' dipole moments along different crystallographic axes leads to the development of strain at the NCs' grain boundaries, which ultimately causes dissociation of the aggregated microstructures into individual uniform-sized PbS NCs. The most distinctive feature of this growth technique is the bare nature and uniform size of the NCs produced. This gives the freedom to fabricate a highly packed NC thin film, which is essential for enhanced charge-transport properties. It simultaneously also precludes the need of undergoing a detrimental solid-state ligandexchange process, which is indispensably required for casting thin films from conventional counterpart long-aliphatic-ligand-capped NCs. To realize the photosensitivity and charge-transport nature of these microwave-synthesized NCs, we fabricated a lateral heterojunction photoconductor and a phototransistor that work on the principal of electron transfer to the metal oxide layer. The photoconductor exhibits prominent multispectral photosensitivity in the visible region, demonstrating high external quantum efficiency and detectivity of 7.42 × 10 2 % and 1.07 × 10 11 jones, respectively. Further, it also shows superior photocurrent generation with respect to the conventional hot-injection-method-synthesized PbS NC-based photoconductor, indicating more efficient inter-NC charge transport in its NC thin film. The unencapsulated photoconductor exhibits a long air-storage lifetime, which reflects air stability of the device and PbS NCs. In addition to the photoconductor, the metal oxide/PbS heterojunction phototransistor also shows superior photosensitivity with a responsivity and a response time of 3 × 10 −2 A/W and 2.2 s, respectively.

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Section: Introductionmentioning

confidence: 99%

Microwave-Polyol Synthesis of Sub-10-nm PbS Nanocrystals for Metal Oxide/Nanocrystal Heterojunction Photodetectors

Paliwal

Singh

Sharma

et al. 2018

ACS Appl. Nano Mater.

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Mikrowellen‐unterstützte Synthese von kolloidalen anorganischen Nanokristallen

Baghbanzadeh

Carbone²,

Cozzoli

et al. 2011

Angewandte Chemie

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Kolloidale anorganische Nanokristalle bestechen durch chemische Eigenschaften, die im Synthesestadium flexibel über Größe, Form und passend zugeschnittene Zusammensetzungen einstellbar sind, und eine Einsetzbarkeit in einem weiten Bereich technischer Anwendungen, angefangen mit der Optoelektronik, über die Energieumwandlung/ ‐erzeugung und Katalyse bis hin zur Biomedizin. Der Einsatz von Mikrowellenbestrahlung als nicht klassische Energiequelle hat bei der Nanokristallsynthese (die im Allgemeinen eine komplexe und zeitaufwändige Verarbeitung von molekularen Vorstufen in Gegenwart von Lösungsmitteln, Liganden und/oder Tensiden bei erhöhten Temperaturen umfasst) an Popularität gewonnen. Ebenso wie bei der mittlerweile weit verbreiteten Anwendung in der organischen Chemie ist die Effizienz des schnellen Aufheizens mit Mikrowellen bei Verringerung der Gesamtprozesssdauer einer der Hauptvorteile dieser Technik. Dieser Aufsatz beschreibt Mikrowellen‐unterstützte Vorgehensweisen, die zur Synthese von kolloidalen anorganischen Nanokristallen entwickelt wurden, und untersucht kritisch die jeweilige Rolle, die der Mikrowellenstrahlung bei der Bildung dieser Nanomaterialien zugeschrieben wird.

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Microwave‐Assisted Synthesis of Colloidal Inorganic Nanocrystals

et al. 2011

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Colloidal inorganic nanocrystals stand out as an important class of advanced nanomaterials owing to the flexibility with which their physical-chemical properties can be controlled through size, shape, and compositional engineering in the synthesis stage and the versatility with which they can be implemented into technological applications in fields as diverse as optoelectronics, energy conversion/production, catalysis, and biomedicine. The use of microwave irradiation as a non-classical energy source has become increasingly popular in the preparation of nanocrystals (which generally involves complex and time-consuming processing of molecular precursors in the presence of solvents, ligands and/or surfactants at elevated temperatures). Similar to its now widespread use in organic chemistry, the efficiency of "microwave flash heating" in dramatically reducing overall processing times is one of the main advantages associated with this technique. This Review illustrates microwave-assisted methods that have been developed to synthesize colloidal inorganic nanocrystals and critically evaluates the specific roles that microwave irradiation may play in the formation of these nanomaterials.

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Characterization of PbS with different morphologies produced using a cyclic microwave radiation

Cited by 7 publications

References 21 publications

Microwave-Polyol Synthesis of Sub-10-nm PbS Nanocrystals for Metal Oxide/Nanocrystal Heterojunction Photodetectors

Microwave-Polyol Synthesis of Sub-10-nm PbS Nanocrystals for Metal Oxide/Nanocrystal Heterojunction Photodetectors

Mikrowellen‐unterstützte Synthese von kolloidalen anorganischen Nanokristallen

Microwave‐Assisted Synthesis of Colloidal Inorganic Nanocrystals

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