2015
DOI: 10.1021/cm504574h
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Integrating β-Pb0.33V2O5 Nanowires with CdSe Quantum Dots: Toward Nanoscale Heterostructures with Tunable Interfacial Energetic Offsets for Charge Transfer

Abstract: Achieving directional charge transfer across semiconductor interfaces requires careful consideration of relative band alignments. Here, we demonstrate a promising tunable platform for light harvesting and excited-state charge transfer based on interfacing β-Pb x V 2 O 5 nanowires with CdSe quantum dots. Two distinct routes are developed for assembling the heterostructures: linker-assisted assembly mediated by a bifunctional ligand and successive ionic layer adsorption and reaction (SILAR). In the former case, … Show more

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Cited by 22 publications
(93 citation statements)
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“…CdSe was deposited directly onto β-Pb 0.33 V 2 O 5 NWs via SILAR using a previously reported method. 13 In a single SILAR cycle, CdSe QDs were grown directly onto β-Pb 0.33 V 2 O 5 NWs by sequentially mixing the NWs with a cadmium precursor solution (Cd(NO 3 ) 2 in ethanol), followed by a selenium precursor (Na 2 Se in ethanol). The NWs were washed with ethanol following each mixing step to remove excess ions.…”
Section: Synthesis Of Cysteinate-capped Cds Quantum Dotsmentioning
confidence: 99%
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“…CdSe was deposited directly onto β-Pb 0.33 V 2 O 5 NWs via SILAR using a previously reported method. 13 In a single SILAR cycle, CdSe QDs were grown directly onto β-Pb 0.33 V 2 O 5 NWs by sequentially mixing the NWs with a cadmium precursor solution (Cd(NO 3 ) 2 in ethanol), followed by a selenium precursor (Na 2 Se in ethanol). The NWs were washed with ethanol following each mixing step to remove excess ions.…”
Section: Synthesis Of Cysteinate-capped Cds Quantum Dotsmentioning
confidence: 99%
“…Cys-CdSe(sm)/β-Pb 0.33 V 2 O 5 and Cys-CdSe(lg)/β-Pb 0.33 V 2 O 5 heterostructures were prepared via LAA as reported previously. 13 An aqueous dispersion of β-Pb 0.33 V 2 O 5 NWs was added to an aqueous dispersion of purified Cys-CdSe(sm) or Cys-CdSe(lg) QDs and allowed to equilibrate overnight (12-16 h). CdSe-functionalized NWs were recovered by centrifugation, rinsed with DI water to remove excess QDs, and dried at room temperature before characterization.…”
Section: Linker-assisted Assembly Of Cys-cdse/β-pb 033 V 2 O 5 Heterostructuresmentioning
confidence: 99%
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“…We were able to confirm this favorable band alignment (i.e., the thermodynamic barrier) at the buried QD/NW interface for hole transfer via high-energy x-ray photoelectron spectroscopy (XPS) measurements. 7 To illustrate the possibility of engineering the thermodynamic barrier for efficient charge separation using this paradigm, we replaced CdSe QDs with CdS. 9 In so doing, we achieved a 0.4eV reduction of the hole-barrier height for hole injection (as confirmed by XPS).…”
Section: 1117/21201703006874 Page 2/3mentioning
confidence: 94%
“…6 Further, attaching CdSe QDs to the Pb x V 2 O 5 NWs resulted in the transfer of photogenerated holes from the quantum dots to the nanowires. 7,8 Holes can then be transported between the catalytic sites by the nanowires, as shown in Figure 1. We were able to confirm this favorable band alignment (i.e., the thermodynamic barrier) at the buried QD/NW interface for hole transfer via high-energy x-ray photoelectron spectroscopy (XPS) measurements.…”
Section: 1117/21201703006874 Page 2/3mentioning
confidence: 99%