The impact of electrostatic interactions on ultrafast charge transfer at Ag<sub>29</sub> nanoclusters–fullerene and CdTe quantum dots–fullerene interfaces

Ahmed, Ghada H.; Parida, Manas R.; Tosato, Alberto; AbdulHalim, Lina G.; Usman, Anwar; Alsulami, Qana A.; Murali, Banavoth; Alarousu, Erkki; Bakr, Osman M.; Mohammed, Omar F.

doi:10.1039/c5tc02927a

Cited by 14 publications

(17 citation statements)

References 55 publications

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“…Simultaneously, a new broad absorption feature appears in the range of 500–560 nm, and an emission peak appears at approximately 507 nm. The intensities of these bands are enhanced with the increase in TCNE concentration, which suggests ground-state complex formation between the NCs and TCNE. − …”

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confidence: 99%

Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors

Ahmed

Liu

Parida

et al. 2016

J. Phys. Chem. Lett.

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Hybrid organic/inorganic perovskites have recently emerged as an important class of materials and have exhibited remarkable performance in photovoltaics. To further improve their device efficiency, an insightful understanding of the interfacial charge transfer (CT) process is required. Here, we report the first direct experimental observation of the tremendous effect that the shape of perovskite nanocrystals (NCs) has on interfacial CT in the presence of a molecular acceptor. A dramatic change in CT dynamics at the interfaces of three different NC shapes, spheres, platelets, and cubes, is recorded. Our results clearly demonstrate that the mechanism of CT is significantly affected by the NC shape. More importantly, the results demonstrate that complexation on the NC surface acts as an additional driving force not only to tune the CT dynamics but also to control the reaction mechanism at the interface. This observation opens a new venue for further developing perovskite NCs-based applications.

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confidence: 99%

Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors

Ahmed

Liu

Parida

et al. 2016

J. Phys. Chem. Lett.

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“…48 If only one type of quenching mechanism is taking place, the quenching can be expressed by the Stern − Volmer equation: [48][49][50][51][52][53][54][55][56] Dynamic quenching happens when the excited fluorophore comes in contact with the quencher molecule, which facilitates non-radiative transition to the ground state and the process leads to the quenching of fluorescence intensity.…”

Section: Fluorescence Response Of Alq 3 -Containing Block Copolymer Bmentioning

confidence: 99%

“…As shown in Fig.11, TNP solution shows two typical absorption bands at 365 nm and 251 nm. [51][52][53][54] Fig. Furthermore, the UV-vis absorption, excitation and emission spectra of the Alq 3 -containing block copolymer brush-GO hybrid were also measured in the absence and presence of TNP.…”

Section: Fig 12mentioning

confidence: 99%

Temperature responsive polymer brushes grafted from graphene oxide: an efficient fluorescent sensing platform for 2,4,6-trinitrophenol

Song

Liu

et al. 2016

J. Mater. Chem. C

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Thermo-responsive block copolymer brushes of PNIPAM-b-P(MQ-co-GMA) were successfully grafted from graphene oxide (GO) by consecutive reversible addition-fragmentation chain transfer (RAFT) polymerizations based on the monomers of N-isopropylacrylamide (NIPAM), 5-(2-methacryloyl-ethyloxymethyl)-8-quinolinol (MQ) and glycidyl methacrylate (GMA). The 8-hydroxyquinoline units in the polymer brushes could coordinate with Al 3+ to form the green luminescent copolymer brushes containing tris(8-hydroxyquinoline)aluminum (Alq3) on the GO surface. The resulting fluorescent hybrid could be used as a nano-platform for the sensitive and robust detection of 2,4,6-trinitrophenol (TNP). The green fluorescence of the polymer brushes modified GO hybrid in aqueous solution could be quenched by TNP via charge transfer and the observed linear fluorescence intensity change allowed the quantitative detection of TNP with a detection limit down to 2.38×10 -9 M. The fluorescence nanohybrids exhibited a robust temperature-responsive behavior as a result of the conformation change in PNIPAM chains of polymer brushes.

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“…Self-organization of [Au 102 ( p -MBA) 44 ] clusters into colloidal sheets and capsids were also driven by weak supramolecular forces . Moreover, noncovalent interactions were decisive in determining the assemblies formed by clusters with cyclodextrins (CDs) , and fullerenes. , Mathew et al showed that supramolecular functionalization of [Au 25 (SBB) 18 ] − (SBB is 4-( t -butyl)benzyl mercaptan) clusters with CDs increased the stability of the cluster core and enhanced the luminescence of the cluster . Nag et al demonstrated that supramolecular complexation can lead to the emergence of interesting properties like isomerism in nanoclusters .…”

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Crystallization of a Supramolecular Coassembly of an Atomically Precise Nanoparticle with a Crown Ether

Chakraborty

Nag

Sugi

et al. 2019

ACS Materials Lett.

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We report the crystal structure of a supramolecular coassembly of a red luminescent silver cluster, [Ag29(BDT)12(TPP)4]3– (referred to as Ag29) (BDT, 1,3-benzene dithiol; TPP, triphenyl phosphine), with dibenzo-18-crown-6 (DB18C6). The structure may be viewed as crystallization-induced self-organization of DB18C6 molecules into cage-like hexamers in the interstitial spaces of the lattice of trigonal Ag29 (Ag29T) clusters, which resulted in an anisotropic expansion of the Ag29T lattice along its z-axis. This structure corresponds to a new family of “lattice inclusion” compounds in nanoclusters. Supramolecular forces guide the assembly of the clusters and the crown ethers, which pack into complex hierarchical patterns in their crystal lattice. We identified the effect of such a coassembly on the solid-state luminescence of the cluster. The crystals containing the coassembly were ∼3.5-fold more luminescent than the parent Ag29T crystals. We also used high-resolution electrospray ionization mass spectrometry to get further insights into the nature of the complexation between Ag29 cluster and DB18C6. This study provides a new strategy for designing cluster-assembled functional materials with enhanced properties.

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The impact of electrostatic interactions on ultrafast charge transfer at Ag₂₉ nanoclusters–fullerene and CdTe quantum dots–fullerene interfaces

Abstract: We report how electrostatic interactions significantly impact charge transfer at CdTe QDs/fullerene interfaces.

Cited by 14 publications

References 55 publications

Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors

Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors

Temperature responsive polymer brushes grafted from graphene oxide: an efficient fluorescent sensing platform for 2,4,6-trinitrophenol

Crystallization of a Supramolecular Coassembly of an Atomically Precise Nanoparticle with a Crown Ether

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The impact of electrostatic interactions on ultrafast charge transfer at Ag29 nanoclusters–fullerene and CdTe quantum dots–fullerene interfaces

Abstract: We report how electrostatic interactions significantly impact charge transfer at CdTe QDs/fullerene interfaces.

Cited by 14 publications

References 55 publications

Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors

Shape-Tunable Charge Carrier Dynamics at the Interfaces between Perovskite Nanocrystals and Molecular Acceptors

Temperature responsive polymer brushes grafted from graphene oxide: an efficient fluorescent sensing platform for 2,4,6-trinitrophenol

Crystallization of a Supramolecular Coassembly of an Atomically Precise Nanoparticle with a Crown Ether

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The impact of electrostatic interactions on ultrafast charge transfer at Ag₂₉ nanoclusters–fullerene and CdTe quantum dots–fullerene interfaces