Modulation of Electron Injection in CdSe−TiO<sub>2</sub>System through Medium Alkalinity

Chakrapani, Vidhya; Tvrdy, Kevin; Kamat, Prashant V.

doi:10.1021/ja909663r

Cited by 105 publications

(90 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Soft Lewis acidic Ag NPs were used as a starting material that is labile to chemical transformation to synthesize metal–semiconductor HNs, an important combination due to the strong interfacial electromagnetic coupling for enhancing the efficiency of light harvesting . Ag NPs with relatively large size distribution, denoted as c‐Ag NPs, were initially synthesized by using citrate as both surface ligands and reductants (Figure S1a, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

From Molecular‐Level Organization to Nanoscale Positioning: Synergetic Ligand Effect on the Synthesis of Hybrid Nanostructures

Ding

Liu

Yang

et al. 2017

Adv Funct Materials

View full text Add to dashboard Cite

A key challenge in advancing the design of hybrid nanostructures (HNs) lies in the difficulty in mastering the principle of selected hybrid formation, which is complicated not only by the size and shape variations of nanoparticles but also by the interfacial phenomena associated with surface ligands. Here this study elaborates the formation mechanism of HNs by a combined experimental and theoretical study employing multiscale simulations and shows how molecular information encoded on particle surface can be transferred into distinct composite patterns. The emergence of different HNs is found to be not only related to ligand binding strengths affecting the reaction kinetics but also the ligand-ligand interactions responsible for phase segregation. Unexpectedly, the sulfidation of Ag nanoparticles co-stabilized by citrate/ gallic acid with different molar ratios constantly produces heterodimers with faster reaction rate than the formation of core-shell structures when they are solely coated by citrate or gallic acid. The surprising result originates from the phase separation of two short surface ligands with large contrast in binding strengths as indicated by photoluminescence spectra and supported by the dissipative particle dynamics simulations. Hierarchical HNs consisting of a heterodimer shell with built-in hot spots can be further synthesized using Au@Ag core-shell particles with mixed surface layers.

show abstract

Section: Resultsmentioning

confidence: 99%

From Molecular‐Level Organization to Nanoscale Positioning: Synergetic Ligand Effect on the Synthesis of Hybrid Nanostructures

Ding

Liu

Yang

et al. 2017

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…35 The attachment process of the two semiconductors, the length of the chain of the linker molecule (in case of linker assisted attachment process), the chemical environment of the heterostructure like pH of the medium, organic passivation, thermal annealing additionally can affect the rate of electron transfer. 36 In ref [20], CdS nanocrystals were synthesized using a solvothermal reaction involving a mixture of two solvents. The CdS nanocrystals exhibit a varying mix of the zinc blende and wurtzite phases by changing the volume ratio of the solvents.…”

Section: Introductionmentioning

confidence: 99%

Probing Ultrafast Photoinduced Electron Transfer to TiO₂ from CdS Nanocrystals of Varying Crystallographic Phase Content

Mazumdar¹,

Roy²,

Srihari

et al. 2015

J. Phys. Chem. C

View full text Add to dashboard Cite

The photoinduced electron transfer processes in a nano-heterostructured semiconductor assembly are complex and depend on various parameters of the constituents of the assembly. We present here the ultrafast electron transfer characteristics of an assembly comprising of a wide band semiconductor, titanium dioxide (TiO 2 ) attached to light harvesting cadmium sulfide (CdS) nanocrystals of varying crystallographic phase content. Quantitative analysis of synchrotron high resolution X-ray diffraction data of CdS nanocrystals precisely reveal the presence of both wurtzite and zinc blende phases in varying amounts. The estimated content of crystal phases is observed to be strongly dependent on an important synthesis parameter viz. the ratio of the two solvents. The biphasic nature of CdS influences directly the shape of the nanocrystal at long reaction times as well as the transfer of the photo-excited electrons from the CdS to TiO 2 as obtained from transient absorption spectroscopy. Higher amount of zinc blende phase is observed to be beneficial for fast electron transfer across the CdS-TiO 2 interface. The electron transfer rate constant differs by one order in magnitude between the CdS nanocrystals and varies linearly with the fraction of the phases.

show abstract

“…The emission yield and the average emission lifetime increase with increasing pH, thus providing a way to monitor the variation in medium pH." [42].…”

mentioning

confidence: 99%

Quantum Dots Solar Cells

Jasim¹

2015

Solar Cells - New Approaches and Reviews

View full text Add to dashboard Cite

Modulation of Electron Injection in CdSe−TiO₂System through Medium Alkalinity

Cited by 105 publications

References 17 publications

From Molecular‐Level Organization to Nanoscale Positioning: Synergetic Ligand Effect on the Synthesis of Hybrid Nanostructures

From Molecular‐Level Organization to Nanoscale Positioning: Synergetic Ligand Effect on the Synthesis of Hybrid Nanostructures

Probing Ultrafast Photoinduced Electron Transfer to TiO₂ from CdS Nanocrystals of Varying Crystallographic Phase Content

Quantum Dots Solar Cells

Contact Info

Product

Resources

About

Modulation of Electron Injection in CdSe−TiO2System through Medium Alkalinity

Cited by 105 publications

References 17 publications

From Molecular‐Level Organization to Nanoscale Positioning: Synergetic Ligand Effect on the Synthesis of Hybrid Nanostructures

From Molecular‐Level Organization to Nanoscale Positioning: Synergetic Ligand Effect on the Synthesis of Hybrid Nanostructures

Probing Ultrafast Photoinduced Electron Transfer to TiO2 from CdS Nanocrystals of Varying Crystallographic Phase Content

Quantum Dots Solar Cells

Contact Info

Product

Resources

About

Modulation of Electron Injection in CdSe−TiO₂System through Medium Alkalinity

Probing Ultrafast Photoinduced Electron Transfer to TiO₂ from CdS Nanocrystals of Varying Crystallographic Phase Content