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(A) Fabrication of 3D SERS paper using the SECOND method with sputtering.
(B) FOS modification of the filter paper enables direct formation of sputtered Au NPs
for hot spot engineering, along with a hydrophobic condensation effect for analyte

manipulation, dramatically enhancing the Raman signals.
(C) 3D SERS paper serving as a label-free, highly sensitive detection platform when used
with a portable Raman spectrometer for various applications.

(A) Schematic representation of the rapid
identification, through portable SERS
analysis, of PQ in intoxication patients.
(B) SERS spectra of PQ at concentrations

from 10–2 to 104 ppm in water.
(C) SERS spectra of PQ at concentrations
from 10–1 to 103 ppm in human serum.
(D) Calibration plot of the SERS intensity of

PQ at 1640 cm–1 with respect to its
concentration in human serum. (E) SERS
spectra of serum samples collected from
three PQ poisoning patients.

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