Metal–Semiconductor Hybrid Aerogels: Evolution of Optoelectronic Properties in a Low-Dimensional CdSe/Ag Nanoparticle Assembly

Nahar, Lamia; Esteves, Richard J Alan; Hafiz, Shopan; Özgür, Ü.; Arachchige, Indika U.

doi:10.1021/acsnano.5b02777

Cited by 44 publications

(56 citation statements)

References 55 publications

(150 reference statements)

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“…[184] In contrast to CdSe/Auhybrid gels,where luminescence quenching was the dominant effect, they found an ew emission channel in between the band edge and the trap state emission of the CdSe nanoparticles.T hey explain this different behavior by more favorable interfacial chemical bonds at the CdSe/Ag interface compared to Au and ac onsequent intermixing of the electronic states. [184] In contrast to CdSe/Auhybrid gels,where luminescence quenching was the dominant effect, they found an ew emission channel in between the band edge and the trap state emission of the CdSe nanoparticles.T hey explain this different behavior by more favorable interfacial chemical bonds at the CdSe/Ag interface compared to Au and ac onsequent intermixing of the electronic states.…”

Section: Gels From Hybrid Nanostructuresmentioning

confidence: 94%

“…TheA rachchige group recently demonstrated the formation of CdSe/Ag aerogels by co-gelation of thiol-stabilized precursor particles with the help of the oxidizing agent TNM. [184] In contrast to CdSe/Auhybrid gels,where luminescence quenching was the dominant effect, they found an ew emission channel in between the band edge and the trap state emission of the CdSe nanoparticles.T hey explain this different behavior by more favorable interfacial chemical bonds at the CdSe/Ag interface compared to Au and ac onsequent intermixing of the electronic states.…”

Section: Gels From Hybrid Nanostructuresmentioning

confidence: 94%

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Modern Inorganic Aerogels

et al. 2017

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Essentially, the term aerogel describes a special geometric structure of matter. It is neither limited to any material nor to any synthesis procedure. Hence, the possible variety of materials and therefore the multitude of their applications are almost unbounded. In fact, the same applies for nanoparticles. These are also just defined by their geometrical properties. In the past few decades nano-sized materials have been intensively studied and possible applications appeared in nearly all areas of natural sciences. To date a large variety of metal, semiconductor, oxide, and other nanoparticles are available from colloidal synthesis. However, for many applications of these materials an assembly into macroscopic structures is needed. Here we present a comprehensive picture of the developments that enabled the fusion of the colloidal nanoparticle and the aerogel world. This became possible by the controlled destabilization of pre-formed nanoparticles, which leads to their assembly into three-dimensional macroscopic networks. This revolutionary approach makes it possible to use precisely controlled nanoparticles as building blocks for macroscopic porous structures with programmable properties.

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Section: Gels From Hybrid Nanostructuresmentioning

confidence: 94%

Section: Gels From Hybrid Nanostructuresmentioning

confidence: 94%

Modern Inorganic Aerogels

et al. 2017

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“…The fast decay component is attributed to the electron trapping into the near-conduction-band-edge states of BVO, and its time constant (τ 1 ) is similar for both BVO (0.30 ns) and Au-BVO (0.32 ns) photoanodes. [46][47][48][49][50] The reason that DET is negligible is that our Au nanospheres have a diameter of 260 nm. Consequently, the intensity-weighted average lifetime τ ave increases from 2.34 ns for BVO to 3.66 ns for Au-BVO.…”

Section: Charge Carrier Dynamicsmentioning

confidence: 99%

Enhancing Mo:BiVO₄ Solar Water Splitting with Patterned Au Nanospheres by Plasmon‐Induced Energy Transfer

Kim

Shi

Jeong

et al. 2017

Advanced Energy Materials

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PEC cells demands the development of stable, economical, and efficient photoanodes. Stable, earth-abundant metal oxides such as TiO 2 , WO 3 , Fe 2 O 3 , and BiVO 4 are popular photoanode candidates. [2,3] However, these metal oxide photoanodes exhibit poor efficiency because they cannot achieve simultaneously high light absorption, charge separation, and charge transfer efficiencies. [4][5][6] One common strategy for improving these metal oxide photoanodes is to decorate them with various plasmonic metals, such as metal nanoparticles or nanorods, to introduce nearfield localized surface plasmon resonance (LSPR) and/or surface plasmon polaritons (SPP). [7][8][9][10][11][12][13][14][15][16][17][18] Many studies on these plasmonic metal nanostructures have focused on the light absorption enhancement effect from LSPR and SPP. [9,[19][20][21][22][23][24][25][26] In addition, LSPR can improve the performance of metal oxide photoanodes through plasmonic energy transfer through two mechanisms: direct electron transfer (DET) and plasmon-induced resonant energy transfer (PIRET). [9,21] DET refers to the hot-electrons injection from plasmonic metal nanoparticles to the conduction band of neighboring metal oxides, and it requires direct contact between metal and metal oxides. [9] PIRET was recently proposed by several pioneering studies. [9,21] PIRET utilizes the nonradiative dipole-dipole coupling between metals and metal oxides to Plasmonic metal nanostructures have been extensively investigated to improve the performance of metal oxide photoanodes for photoelectrochemical (PEC) solar water splitting cells. Most of these studies have focused on the effects of those metal nanostructures on enhancing light absorption and enabling direct energy transfer via hot electrons. However, several recent studies have shown that plasmonic metal nanostructures can improve the PEC performance of metal oxide photoanodes via another mechanism known as plasmon-induced resonant energy transfer (PIRET). However, this PIRET effect has not yet been tested for the molybdenum-doped bismuth vanadium oxide (Mo:BiVO 4 ), regarded as one of the best metal oxide photoanode candidates. Here, this study constructs a hybrid Au nanosphere/Mo:BiVO 4 photoanode interwoven in a hexagonal pattern to investigate the PIRET effect on the PEC performance of Mo:BiVO 4 . This study finds that the Au nanosphere array not only increases light absorption of the photoanode as expected, but also improves both its charge transport and charge transfer efficiencies via PIRET, as confirmed by time-correlated single photon counting and tran-

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“…[182,183] Arachchige und Mitarbeiter demonstrierten vor kurzem die Bildung von CdSe/Ag-Aerogelen mittels Kogelierung von Thiol-stabilisierten Vorstufenpartikeln mithilfe des Oxidationsmittels TNM. [184] Anders als bei CdSe/Au-Hybridgelen, in denen Lumineszenzlçschung der dominante Effekt war, fanden sie neue Emissionskanäle zwischen der Bandlücke und der Fehlstellenemission der CdSe-Nanopartikel. Sie erklären diesen Unterschied mit bevorzugteren Grenzflächenbindungen auf der CdSe/Ag-Oberfläche gegenüber Au und dem folglich stattfindenden Vermischen der elektronischen Zustände.…”

Section: Gele Aus Hybridnanostrukturenunclassified

Moderne Anorganische Aerogele

et al. 2017

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Der Begriff Aerogel beschreibt im Wesentlichen eine besondere geometrische Struktur der Materie, die materialunabhängig ist und keinem speziellen Syntheseverfahren unterliegt. Grundsätzlich können daher Aerogele aus unzähligen Materialien bestehen, wodurch die Anwendungsmöglichkeiten nahezu unbegrenzt sind. Dasselbe trifft auf Nanopartikel zu. Diese werden ebenso durch ihre geometrischen Eigenschaften definiert. In den letzten Jahrzehnten standen daher nanoskalige Materialien im Fokus der Forschung, und es entwickelten sich mögliche Anwendungen in vielen naturwissenschaftlichen Bereichen. Heute ist eine Vielzahl an Metall‐, Halbleiter‐, Oxid‐ und anderen Nanopartikeln durch kolloidale Synthesen zugänglich. Dennoch ist es für eine Anwendung oft notwendig, dass diese Materialien zuvor in makroskopische Strukturen angeordnet werden. Dieser Aufsatz gibt eine ausführliche Übersicht über die Entwicklung, die die Welt der kolloidalen Nanopartikel und der Aerogele miteinander vereint. Ermöglicht wurde dies durch die kontrollierte Destabilisierung der vorab gebildeten Nanopartikel, die zu einer Anordnung der Nanopartikel zu einem dreidimensionalen, makroskopischen Netzwerk führt. Dieses revolutionäre Konzept verleiht die Möglichkeit, präzise kontrollierte Nanopartikel als Grundbausteine für makroskopische, poröse Strukturen mit einstellbaren Eigenschaften zu nutzen.

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Metal–Semiconductor Hybrid Aerogels: Evolution of Optoelectronic Properties in a Low-Dimensional CdSe/Ag Nanoparticle Assembly

Cited by 44 publications

References 55 publications

Modern Inorganic Aerogels

Modern Inorganic Aerogels

Enhancing Mo:BiVO₄ Solar Water Splitting with Patterned Au Nanospheres by Plasmon‐Induced Energy Transfer

Moderne Anorganische Aerogele

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Metal–Semiconductor Hybrid Aerogels: Evolution of Optoelectronic Properties in a Low-Dimensional CdSe/Ag Nanoparticle Assembly

Cited by 44 publications

References 55 publications

Modern Inorganic Aerogels

Modern Inorganic Aerogels

Enhancing Mo:BiVO4 Solar Water Splitting with Patterned Au Nanospheres by Plasmon‐Induced Energy Transfer

Moderne Anorganische Aerogele

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Enhancing Mo:BiVO₄ Solar Water Splitting with Patterned Au Nanospheres by Plasmon‐Induced Energy Transfer