Yan-mei LIU, Yuan PEI, Bo LI, Hui-yan LI, Xue-pei WANG, Hao-han XIAN, Ying-na WEI, Ying CHEN, Zhi-gang DI, Zhen-gang WU, Heng-yong WEI. Preparation of Gold/Silver/Titanium Nitride Suface-Enhanced Raman Substrate and Its Effect on Nicotinic Acid Quantitative Detection[J]. Spectroscopy and Spectral Analysis, 2021, 41(7): 2092
- Spectroscopy and Spectral Analysis
- Vol. 41, Issue 7, 2092 (2021)
Fig. 1. (a) XRD spectra of TiN, TiN-Au, TiN-Ag and TiN-Au-Ag composite substrate; (b) Peak fitting graph of TiN-Au-Ag composite substrate; (c) Absorption spectra of different SERS substrate
Fig. 2. (a)—(d) FE-SEM image of substrate; (e)—(f) TEM image of Ag colloid solution; (g)—(i) EDS image of TiN-Au-Ag composite substrate
Fig. 3. HOMO-LUMO orbital and HOMO-LUMO gap of nicotinic acid
Fig. 4. 2D-FDTD simulation of the substrate
(a): Ag colloid solution; (b): TiN-Ag substrate;(c): TiN-Au substrate; (d): TiN-Au-Ag composite substrate
(a): Ag colloid solution; (b): TiN-Ag substrate;(c): TiN-Au substrate; (d): TiN-Au-Ag composite substrate
Fig. 5. (a) SERS spectra of nicotinic acid on different substrate; (b) Histogram of nicotinic acid on different substrate
Fig. 6. (a) SERS spectra of nicotinic acid at different pH value; (b) The structure charge of nicotinic acid with variation of pH; (c) SERS histogram of nicotinic acid at different pH value
Fig. 7. (a) SERS spectra of diffesent concentration of nicotinic acid adsorbed on the substrate; (b) Relationship between the logarithm of nicotinic acid concentration and logarithm of Raman intensity at 1 033 cm-1
Fig. 8. (a) SERS spectra of different concentration of nicotinic acid in gypenoside solution; (b) Relationship between the logarithm of nicotinic acid concentration and logarithm of Raman intensity at 1 033 cm-1
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