加热或暴露于高强度Laser场时SERS信号的增加：AgFON底物上的苯硫酚
Increase of SERS Signal Upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate
摘要：
在100 ℃加热3.5分钟和125 ℃加热1.5分钟后，观察到来自AgFON等离子体基片的表面增强拉曼散射（SERS）信号增加约100%。在高强度（3.2 kW/cm^2）785 nm连续激光下暴露10秒后，发现信号强度进一步增加约80%，相当于40 mW的40+/-5-um直径光斑。所观察到的SERS信号的增加可以通过考虑除了形成自组装单层的常规有序分子之外的中间体或“前体”状态中的苯乙撑分子的存在来理解。SERS信号的增加是由于热效应和光热效应导致前体状态的分子转化为化学吸附状态。
英文摘要：
The surface-enhanced Raman scattering (SERS) signal from an AgFON plasmonic substrate, recoated with benzenethiol, was observed to increase by about 100% upon heating for 3.5 min at 100C and 1.5 min at 125C. The signal intensity was found to increase further by about 80% upon a 10 sec exposure to a high-intensity (3.2 kW/cm^2) 785-nm cw laser, corresponding to 40 mW in a 40+/-5-um diameter spot. The observed increase in the SERS signal may be understood by considering the presence of benzenethiol molecules in an intermediate or 'precursor' state in addition to conventionally ordered molecules forming a self-assembled monolayer. The increase in the SERS signal arises from the conversion of the molecules in the precursor state to the chemisorbed state due to thermal and photo-thermal effects.
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