2 research outputs found
High-Performance Silicon Photoanode Enhanced by Gold Nanoparticles for Efficient Water Oxidation
Ni catalyst is a
low-cost catalyst for oxygen evolution reaction (OER) on silicon metalâinsulatorâsemiconductor
photoanode. We found that Au nanoparticles incorporated with Ni nanoparticles
can enhance the OER activity and stability of Ni nanoparticles due
to the local surface plasmon resonance (LSPR) effect of the Au nanoparticles.
The efficiency of NiAu/TiO<sub>2</sub>/n-Si photoanode can be boosted
at least three times under the illumination (100 mW/cm<sup>2</sup>) by LSPR effect of the Au nanoparticles. A small onset potential
of 1.03 V versus reversible hydrogen electrode (overpotential, η<sub>0</sub> = â0.20 V) and a current density of 18.80 mA/cm<sup>2</sup> at 1.23 V versus reversible hydrogen electrode can be obtained.
The NiAu/TiO<sub>2</sub>/n-Si photoanode exhibits a high saturation
current density of 35 mA/cm<sup>2</sup>, which is greater than that
of most of the state-of-the-art silicon photoanodes
Synergetic SERS Enhancement in a Metal-Like/Metal Double-Shell Structure for Sensitive and Stable Application
Because
of either thermal/chemical instability or high optical loss in noble
metal nanostructures, searching for alternative plasmonic materials
is becoming more and more urgent, considering the practical biosensing
applications under various extreme conditions. In this work, titanium
nitride (TiN), a low-loss metal-like material with both excellent
thermal and excellent chemical stabilities, was proposed to composite
with Ag hollow nanosphere (HNS) nanostructures as an effective surface-enhanced
Raman scattering (SERS) substrate to realize both highly sensitive
and highly stable molecular detection. Because of the multiple-mode
local surface plasmon resonance around the spherical composite nanospheres
and the âgap effectâ derived from the ultrasmall nanogaps
within the precisely controlled plasmonic arrays, an intensively enhanced
local field was successfully induced on this SERS substrate. Combined
with the unique charge transferring process between Ag and TiN, a
synergistically enhanced SERS sensitivity involving both physical
and chemical mechanisms was achieved. Especially, with the isolation
of TiN, a time-durable Raman detection on these TiNâAg HNS
arrays was accomplished, showing great potential for practical applications