Photocatalytic Mechanism Control and Study of Carrier Dynamics in CdS@C3N5 Core–Shell Nanowires

Nanosheet Rhodamine B
DOI: 10.1021/acsami.1c08550 Publication Date: 2021-10-06T20:02:18Z
ABSTRACT
We present a potential solution to the problem of extraction photogenerated holes from CdS nanocrystals and nanowires. The nanosheet form C3N5 is low-band-gap (Eg = 2.03 eV), azo-linked graphenic carbon nitride framework formed by polymerization melem hydrazine (MHP). nanosheets were either wrapped around nanorods (NRs) following synthesis pristine chalcogenide or intercalated among them an in situ protocol two kinds heterostructures, CdS-MHP CdS-MHPINS, respectively. improved photocatalytic degradation rate 4-nitrophenol nearly order magnitude comparison bare NRs. also enhanced sunlight-driven activity NWs for decolorization rhodamine B (RhB) remarkable 300% through utilization due surface passivation. More interestingly, provided reaction pathway control over RhB degradation. In absence scavengers, degraded N-deethylation pathway. When hole scavenger electron was added solution, remained mostly unchanged, while mechanism shifted chromophore cleavage (cycloreversion) investigated optoelectronic properties CdS-C3N5 heterojunctions using density functional theory (DFT) simulations, finite difference time domain (FDTD) time-resolved terahertz spectroscopy (TRTS), photoconductivity measurements. TRTS indicated high carrier mobilities >450 cm2 V–1 s–1 relaxation times >60 ps CdS-MHP, CdS-MHPINS exhibited much lower <150 short <20 ps. Hysteresis photoconductive J–V characteristics disappeared confirming Dispersion-corrected DFT simulations delocalized HOMO LUMO localized on CdS-MHP. C3N5, with its extended π-conjugation low band gap, can function as shuttle extract carriers excitons nanostructured heterojunctions, enhance performance devices. Our results demonstrate how dynamics core–shell heterostructures be manipulated achieve photocatalysis.
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