Plasmonic porous ceramics based on zirconia-toughened alumina functionalized with silver nanoparticles for surface-enhanced Raman scattering

Guo, Tongwei; Karim, Md. Nurul; Ghosh, Kowsik; Murshed, M. Mangir; Rezwan, Kurosch; Maas, Michael

doi:10.1016/j.oceram.2022.100228

Cited by 3 publications

(22 citation statements)

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“…Analogous to our previous work with Ag NPs, [ 5 ] we detected high EFs of the porous substrates functionalized with the herein described core–shell particles. To highlight the additional enhancement from the porous structure, Figure a shows Raman spectra of pyridine on porous (red) and dense (grey) substrates, each functionalized with 48 nm Au@Pt.…”

Section: Resultssupporting

confidence: 85%

“…In this case, the porous sample delivered around seven times higher EF than that of the dense sample, which corresponds to our previous findings. [ 5 ] The EF was ≈10 times higher when using 4‐NTP as the reporter molecule.…”

Section: Resultsmentioning

confidence: 99%

“…Processing of Plasmonic Porous Ceramics: The ZTA porous ceramics were fabricated by the polymer replica method with recoating according to previous work. [5,53] In short, the 30 ppi (pore per inch) PU foams were cut into 15 × 15 × 10 mm small blocks and fully submerged in 80 wt% ZTA ceramic slurry. Excess slurry in the foam was squeezed out manually.…”

Section: Methodsmentioning

confidence: 99%

“…The Raman peak at 1015 cm −1 can be assigned to pyridine adsorbed on the Pt shell. [60] The Raman enhancement factor of the substrates was calculated as described in our previous work [5] using the Raman intensity at 1026 and 1015 cm −1 for Au@Pd and Au@Pt NPs functionalized substrates, respectively, and the intensity of pure pyridine adsorbed on a porous ZTA sample without metal nanoparticles. In accordance to the UV-vis spectra discussed above, the EFs of the substrates functionalized with the metallic core-shell NPs show a decreasing trend with increasing shell thicknesses.…”

Section: Molecule Detection With Plasmonic Porous Ceramicsmentioning

confidence: 99%

“…In our own previous work, [ 5 ] we have introduced the concept of plasmonic porous ceramics‐based zirconia‐toughened alumina (ZTA) functionalized with Ag NPs that combine the optical properties of plasmonic nanostructures with advantages of ceramics, such as stability at extreme temperatures and pressures, chemical inertness, dielectric properties and biocompatibility. [ 47–51 ] In these experiments, silver (Ag) NPs were deposited onto the open porous ceramic matrix through chemical reduction.…”

Section: Introductionmentioning

confidence: 99%

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Ceramic Open Cell Foams Featuring Plasmonic Hybrid Metal Nanoparticles for In Situ SERS Monitoring of Catalytic Reactions

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et al. 2023

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This work presents porous zirconia‐toughened alumina ceramics functionalized with Au@Pd/Au@Pt core–shell nanoparticle (NP) for in situ monitoring of catalytic reactions via surface‐enhanced Raman scattering (SERS) which is augmented by the open cell foam structure of the ceramic support. In this respect, the porous ceramic enables efficient light trapping and propagation onto the coated surface, which provides good accessibility of the catalyst, while the core–shell particles are equipped with a catalytically active shell and a plasmonic core which enables SERS sensing. The metallic hybrid core–shell NPs are synthesized by the Au‐seed mediated method and colloidally deposited onto the open porous ceramic matrix prepared via the polymer replica method. The Au@Pt NP functionalized porous ceramic show a Raman enhancement factor up to 106, which is significantly higher than that of non‐porous samples. In situ reaction monitoring via SERS is demonstrated by the Pt‐catalyzed reduction of 4‐nitrothiophenol to 4‐aminothiophenol, showing high specificity for analysis of reactants and products. This multifunctional material concept featuring ceramics‐augmented SERS and catalytic activity could be extended beyond real‐time, sensitive reaction monitoring toward high temperature reactions, photothermal catalysis, bioprocessing and ‐sensing, green energy conversion, and related applications.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Molecule Detection With Plasmonic Porous Ceramicsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ceramic Open Cell Foams Featuring Plasmonic Hybrid Metal Nanoparticles for In Situ SERS Monitoring of Catalytic Reactions

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Gold Nanoparticle‐Coated Bioceramics for Plasmonically Enhanced Molecule Detection via Surface‐Enhanced Raman Scattering

Guo,

Schmidt,

Murshed

et al. 2023

Adv Eng Mater

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In this study we evaluate the feasibility of plasmonically‐enhanced molecule detection via surface‐enhanced Raman scattering (SERS) for ceramics that are commonly used as bone or tooth replacement materials. Open cell foams of Bioglass45S5, the commercial hydroxyapatite‐based product Bio‐Oss® and bio‐inert zirconia‐toughened‐alumina (ZTA) were coated with Au nanoparticles via colloidal deposition to introduce plasmonic effects. Depending on the pore size, gold‐functionalized plasmonic porous Bioglass showed effective Raman enhancement factors (eEF) up to 5.4·104, while depositing gold nanoparticles on Bio‐Oss® and porous ZTA resulted in EFs of 1.1·104 and 2.4·105, respectively. The performance of the plasmonic porous bioceramics under simulated biological conditions was examined in situ in the biological medium fetal bovine serum (FBS) and during extended incubation in mineralizing simulated body fluid (SBF). Most notably, the plasmonic porous Bioglass still delivered an EF around 7.2·103 after 28 days of incubation in SBF, indicating a promising stability in simulated biological conditions without significant difference in SBF‐bioactivity before and after Au‐deposition. Accordingly, the plasmonically‐enhanced porous bioceramics offer the possibility for real‐time and sensitive molecule detection at SBF and FBS conditions and could be further developed for sensing of specific biomarkers, e.g. in the context of osseointegration of bone replacement materials. Beyond biomedical applications, the plasmonically‐enhanced ceramics can be used for biotechnological applications featuring in situ monitoring of molecule turn‐over rates within porous reactors.This article is protected by copyright. All rights reserved.

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Selective Nitridation of Ceramic Open Cell Foams for Efficient Photothermal Heating

Oyedepo,

Rezwan,

Maas

2023

Adv Materials Technologies

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This study presents the synthesis of ceramic open cell foams as a new platform for photothermal energy conversion based on the inert structural ceramic alumina and the plasmonic transition metal nitride TiN. TiO2 precursor grains inside the mixed ceramic matrix are converted to TiN via the molten salt synthesis route. Photothermal measurements using an 850 nm LED as a light source show that the ceramic foams with only ≈5% TiN in the alumina matrix showed a 34% increased efficiency in converting light to heat compared to flat ceramic discs of the same composition. The TiN content in the flat discs does not affect the heat conversion efficiency, indicating that the available surface area and the material's ability to trap and direct light to the plasmonic nanostructures are the most important parameters for its photothermal activity. These results show the feasibility of synthesizing mixed ceramics based on inert materials like alumina and transition metal nitrides. Applications in solar heating, water evaporation, and related use cases of photothermal energy conversion can be realized with improved performance over 2D materials. Particularly processes that are based on continuous flow like solar thermal heating or photothermal catalysis will benefit from this new material platform.

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Plasmonic porous ceramics based on zirconia-toughened alumina functionalized with silver nanoparticles for surface-enhanced Raman scattering

Cited by 3 publications

References 91 publications

Ceramic Open Cell Foams Featuring Plasmonic Hybrid Metal Nanoparticles for In Situ SERS Monitoring of Catalytic Reactions

Ceramic Open Cell Foams Featuring Plasmonic Hybrid Metal Nanoparticles for In Situ SERS Monitoring of Catalytic Reactions

Gold Nanoparticle‐Coated Bioceramics for Plasmonically Enhanced Molecule Detection via Surface‐Enhanced Raman Scattering

Selective Nitridation of Ceramic Open Cell Foams for Efficient Photothermal Heating

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