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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Surface-Enhanced Raman Scattering Detected Temperature Programmed Desorption Optical Properties,Nanostructure,and Stability of Silver Film SiO_2 Nanosphere Surfaces
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Surface-Enhanced Raman Scattering Detected Temperature Programmed Desorption Optical Properties,Nanostructure,and Stability of Silver Film SiO_2 Nanosphere Surfaces

机译：表面增强拉曼散射检测的温度程序解吸光学性质，纳米结构和银膜SiO_2纳米球表面的稳定性

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In this work ,silver film over silica nanosphere(AgFON) surfaces are shown to be thermally stable,SERS- active substrates that are suitable for use in ultrahigh vacuum(UHV) conditions.The metal FON surface is a materras general,cost-effective,and higly SERS -active surface.The SER activity and thermal stability were investigated by adsorbing benzene,pyridine,and C_(60) onto the AgFON surface .We chose these adsorbates for the following reasons(1) vibrational spectroscopy and temperature -prorammed desorption(TPD) behavior of benzene adsorbed onto metal surfaces has been wiely investigated and is a simple system to study, respectively;(2) characteristics of pyridine adsorption on the AgFON surface can be compared to a large body of previous studies;and (3) hih-temperature studies of C_(60) adsorption can be performed.TPD demonstrates that the AgFON surface has two classes o adsorption sites(1) those that mimic the behaviorof single crystal surfaces and (2) defect sites with higher adsorbate binding energies.Room temperature annealing does not irreversibly destroy the SERS enhancement capability of this surface ,thereby permitting for repeated use in UHV experiments,The AgFON surface morphology and localized surface plasmon resonance frequencies .as monitored by UV-vis extinction ,change as the AgFON surface tmeperatures increases for 300 to 548 K, and the SERSactivity corresponds with these changes.Because the AgFON surface is thermally stable at roon temperature and retains high SERS-activity following temperature annealin to 573 K, it is unlikely that adatoms or adatom clusters play a significant role as adsorption sites supporting the chemical enhancement mechanism.Rather,one can conclude that the electromagnetic enhancement mechanism is the most likely origin of the SER spectra from benzene,pyridine,and C_(60) adsorbed on AgFON surfaces.
机译：在这项工作中，二氧化硅纳米球（AgFON）表面上的银膜显示出热稳定性，适用于超高真空（UHV）条件下的SERS活性基板。金属FON表面是一般的，具有成本效益的，通过将苯，吡啶和C_（60）吸附到AgFON表面上来研究SER活性和热稳定性。我们选择这些吸附物的原因如下：（1）振动光谱和温度限制的解吸（ TPD）对苯吸附在金属表面上的行为进行了深入研究，并且是一个简单的研究系统;（2）吡啶在AgFON表面上的吸附特性可以与以前的大量研究进行比较;和（3）嗨TPD证明AgFON表面具有两类吸附位点：（1）模仿单晶表面行为的吸附位点;（2）具有较高吸附率的缺陷位点室温退火不会不可逆地破坏该表面的SERS增强能力，因此可以重复用于特高压实验，AgFON表面形态和局部表面等离振子共振频率。通过紫外可见消光监测，变化为AgFON表面温度在300至548 K时会增加，并且SERS活性与这些变化相对应。由于AgFON表面在鲁昂温度下具有热稳定性，并且在退火至573 K的温度后仍保持较高的SERS活性，因此不太可能出现吸附原子或吸附原子团簇相反，可以得出结论，电磁增强机制是最有可能来自吸附在AgFON表面上的苯，吡啶和C_（60）的SER光谱的起源。

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