Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 3, Issue 5, Pages 1562-1567Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am200127c
Keywords
photochemistry; ferroelectric; BiFeO3; atomic force microscopy
Funding
- National Science Foundation [DMR 0804770]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0804770] Funding Source: National Science Foundation
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The reduction of silver from an aqueous solution on BiFeO3 surfaces, activated by visible light, was investigated as a function of crystal and ferroelectric domain orientation. When excited by light with energy between 2.53 and 2.70 eV, BiFeO3 photochemically reduces silver cations from solution in patterns corresponding to the underlying ferroelectric domain structure. Silver is preferentially reduced on domains with a positive polarization directed toward the surface. The amount of reduced silver depends on whether the component of the domain polarization normal to the surface is positive or negative, but is relatively insensitive to the crystal orientation. It is concluded that the ferroelectric polarization decreases electron drift to the surface in domains with a negative polarization, causing spatially selective photochemical behavior, and that the direction of the polarization is more important than the amplitude.
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