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Molecular Tilting Alignment on Ag@C Nanocubes Monitored by Temperature-Dependent Surface Enhanced Raman Scattering
Yinong Wang1, Yinghui Sun2, Di Chen2
1Department of Physics, Beihang University, Beijing, 100191, China.
Scientific Reports
|October 18, 2017
Summary
Synthesized silver core@carbon shell (Ag@C) nanocubes demonstrate stable surface-enhanced Raman spectroscopy (SERS) activity. Temperature influences adsorbed molecule orientation, with molecules preferring a flat arrangement as temperature decreases.
Area of Science:
- Nanotechnology
- Materials Science
- Spectroscopy
Background:
- Core@shell silver@carbon (Ag@C) nanocubes (NCs) synthesized via a one-pot hydrothermal method.
- Carbon layer protects silver cores from oxidation and stabilizes structure.
- Optical properties of nanostructured metals are temperature-dependent for SERS.
Purpose of the Study:
- Investigate the relationship between adsorbed molecule orientation and temperature using SERS.
- Evaluate the long-term stability and SERS activity of Ag@C NCs.
Main Methods:
- Large-scale synthesis of Ag@C NCs using a one-pot hydrothermal method.
- Systematic investigation of temperature effects on molecule orientation via SERS.
- Stability testing of Ag@C NCs after one-year storage in water.
Main Results:
- Adsorbed 4-mercaptobenzoic acid (4-MBA) molecules exhibit a preference for flat orientation on Ag@C NCs as temperature decreases.
- Ag@C NCs retain high SERS-active capability even after one year of storage.
- Synthesized NCs display excellent and stable optical properties.
Conclusions:
- Ag@C NCs offer a stable and effective platform for SERS applications.
- Temperature plays a crucial role in controlling molecular orientation on nanostructured surfaces.
- Potential applications in sensors and ultrasensitive spectral analysis.
