An
ideal surface-enhanced Raman scattering (SERS) substrate should
have high sensitivity, long-term stability, excellent repeatability,
and strong anti-interference. In the present work, single-layer carbon-based
dot (CD)-capped Ag nanoparticle aggregates (a-AgNPs/CDs) with high
SERS activity are synthesized and hybridized with a hydrogel to prepare
novel hydrogel SERS chips. Benefiting from the unique properties of
a-AgNPs/CDs and the hydrogel, the constructed hydrogel SERS chips
show excellent performances. Taking crystal violet detection as an
example, the hydrogel SERS chips show a detection limit of around
1 × 10–16 mol/L (high sensitivity), maintain
above 96.40% of SERS activity even after 14 weeks of storage (long-term
stability), and display point-to-point relative standard deviation
(RSD) in one chip as low as 1.43% (outstanding repeatability) and
RSD in different chips as low as 2.75% (excellent reproducibility).
Furthermore, the self-extraction effect of the hydrogel enables the
flexible hydrogel SERS chips to be used for analyzing various real
samples including soybean milk, juices, and fruits without any complex
pretreatment. For instance, the hydrogel SERS chips are able to detect
trace thiram and 2-(4-thiazolyl)benzimidazole with the detection limits
of 1 and 5 ppb in liquid samples, respectively, and of 1 and 2.5 ng/cm2 on the peel of fruits, respectively. The self-extraction
functional flexible SERS chips offer a reliable and convenient platform
for the quick detection and on-site monitoring of chemical contaminants.
Surface enhanced Raman scattering (SERS) is an ultrasensitive analytic technique. However, the application of SERS in quantitative analysis usually suffers from poor reliability due to the limitations of current developed...
For the first time, a systematical investigation has been carried out to verify luminescent molybdenum disulfide quantum dots (MoS2 QDs). We found that the well-reported blue fluorescence of the so-called...
Carbon based dots capped gold nanoparticles (AuNPs/CDs) are synthesized and found to present high singlet oxygen (1O2)-generation capability due to the synergistic effect of the strong localized surface plasmon resonance...
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