Commercial Gold Nanoparticles on Untreated Aluminum Foil: Versatile, Sensitive, and Cost-Effective SERS Substrate
Table 1
Raman signals, LODs, and AEFs calculated from detection of CV and detection of NBT on 60 nm AuNPs set on various substrates (Al foil, Au film, and glass).
Analyte/substrate
Slope signal versus log C
LOD, nM
C for LOD (linear range)
Average Raman intensity
Standard error of Raman signal
AEF for nM
CV/Au film
0,91
166
0.35
10 nM 1 nM 0.3 nM Blank
373 164 131 90
87 12 3 5
3.7 × 106
CV/Al foil
0,992
2421
0.19
10 nM 1 nM 0.3 nM Blank
494 288 162 101
71 21 12 4
5.5 × 106
CV/glass
0,841
668
1.96
100 nM 10 nM 1 nM 0.3 nM Blank
1451 164 115 116 93
160 14 10 9 2
2.1 × 106
NBT/Au
0,96
3211
7.23
10 μM
10127
437
1.2 × 107
1 μM
4124
214
100 nM
388
3
0.3 nM
438
Blank
110
6
NBT/Al foil
0,989
265
0.12
10 nM
836
45
2.3 × 107
1 nM
662
50
0.3 nM
410
16
Blank
233
NBT/glass
0.90
259
0.44
10 nM 1 nM 0.3 nM Blank
608 248 237 214
21 3 3 3
1.5 × 106
0.3 nM for CV/glass and 0.3 nM NBT/Au are outside of calibration range, but it shows that 1 nM and 0.3 nM CV concentrations cannot be distinguished on this substrate.
