Mesoporous Au films assembled on flexible cellulose nanopaper as high-performance SERS substrates

Defect engineering in semiconductor-based SERS

“…assembled into arrays to further induce strong EM enhancement, and have been used in the detection of probe molecules such as DNA structures, pesticide residues and small organic molecules. [1][2][3][4][5][6] However, noble metal-based substrates have also met challenges, such as high cost, difficulty of mass production, instability, and lack of selectivity. 7 As a relatively new branch of SERS research, semiconductors have been speculated as ideal SERS materials due to their multifaceted tunability, wide variety and easy accessibility.…”

Versatile core–shell magnetic fluorescent mesoporous microspheres for multilevel latent fingerprints magneto‐optic information recognition

“…These mesoporous microspheres possess many unique properties, including high surface area, large pore size and abundant mesostructures. [49][50][51][52][53] Moreover, the core-shell mesoporous structure protect cores from corrosion by acid or oxidation and provide porous shells for cargo loading and impregnation, thus expanding their applications. [54][55][56][57] The assynthesized Fe 3 O 4 @mesoSiO 2 microspheres were soaked in an aqueous solution containing of Y 3+ , Eu 3+ , and VO 4 3À (RE precursor) to introduce the precursor of YVO 4 :Eu 3+ into mesopore channels by virtue of capillary force.…”

“…After decompose RF in the outer RF/silica shell via calcination treatment, uniform Fe 3 O 4 @mesoSiO 2 microspheres were obtained. These mesoporous microspheres possess many unique properties, including high surface area, large pore size and abundant mesostructures 49–53 . Moreover, the core–shell mesoporous structure protect cores from corrosion by acid or oxidation and provide porous shells for cargo loading and impregnation, thus expanding their applications 54–57 .…”

“…Optical photographs (Figures S15 and S16) clearly show that the latent fingerprints aged at simulated warm and hot climates at 20–40°C and cold climates at 4 and −18°C can be mostly detected, but the resolution visually declined with the increase of aging time. It is mainly due to the continuous evaporation of the moisture and grease in the handprint remnants which diminish the affinity with the powders 51 . In addition, the red luminescence fingerprint can still be observed even being developed by those Fe 3 O 4 @mesoSiO 2 @YVO 4 :Eu 3+ microspheres stored for 8 months (Figure S17), reflecting the excellent fluorescent stability of Fe 3 O 4 @mesoSiO 2 @YVO 4 :Eu 3+ microsphere developers, and this is also confirmed by PL spectra that the emission intensity of microspheres stored for 8 months has little reduction (Figure S18).…”

Flexible SERS substrate of silver nanoparticles on cotton swabs for rapid in situ detection of melamine

“…Therefore, the development of exible SERS substrates with high SERS activity, uniformity, reproducibility and stability became of increasing interest. For example, metal nanostructures have been deposited onto nanobers, [22][23][24] hydrogel, 25 polystyrene-block-poly-(ethylene oxide), 26 and polydimethylsiloxane 27,28 to construct so and exible SERS substrates. In recent years, cotton swabs as a support material for the deposition of gold or silver nanoparticles have attracted considerable interest, owing to the low cost of the swabs and their ready accessibility and portability.…”