Toward the Limitation of Dealloying: Full Spectrum Responsive Ultralow Density Nanoporous Gold for Plasmonic Photocatalytic SERS.
Jinglin HuangCuilan TangGuo ChenZhibing HeTao WangXiaoshan HeTaimin YiYansong LiuLing ZhangKai DuPublished in: ACS applied materials & interfaces (2021)
Plasmon-mediated chemical reaction has a great potential to create self-cleaning surface-enhanced Raman scattering (SERS) substrates. However, few works have been reported to promote this goal. Here, we report ultralow density nanoporous gold (ULDNPG) that possesses an impressive full spectrum responsive characteristic with a reflectivity lower than 5% in the waveband of 300-900 nm. ULDNPG was fabricated by a sandwich dealloying strategy from ultradilute Au-Ag solid solutions with the Au content as low as 1-5 at.%. The prepared ULDNPG presents excellent SERS properties, including high sensitivity, high uniformity, and reproducibility. The full spectrum responsive characteristic of ULDNPG leads to an obvious plasmonic photocatalytic activity. The short lifetime of the SP-excited hot carriers causes a restricted self-cleaning SERS property and a strong photothermal effect for ULDNPG structures.
Keyphrases
- sensitive detection
- visible light
- gold nanoparticles
- reduced graphene oxide
- quantum dots
- cancer therapy
- energy transfer
- label free
- raman spectroscopy
- photodynamic therapy
- highly efficient
- drug delivery
- single molecule
- high resolution
- silver nanoparticles
- risk assessment
- metal organic framework
- human health
- mass spectrometry
- drug release
- electron transfer