Fabrication of Au- and Ag–SiO2 inverse opals having both localized surface plasmon resonance and Bragg diffraction

Erola, Markus O. A.; Philip, Anish; Ahmed, Tanzir; Suvanto, Sari; Pakkanen, Tuula T.

doi:10.1016/j.jssc.2015.06.036

Cited by 35 publications

(35 citation statements)

References 32 publications

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“…Similar approaches to achieve metallic Au NP self-assembly on PS colloid templates was investigated in the previous studies using electrostatic interaction. [35][36][37] However, the distinctive feature of our work is to employ apoferritin to encapsulate the metallic NPs, which can promote the dispersion property as well as formation of nanoscale size.…”

Section: Morphological and Structural Evaluationmentioning

confidence: 99%

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Choi

Kim

Cho

et al. 2016

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A novel catalyst functionalization method, based on protein-encapsulated metallic nanoparticles (NPs) and their self-assembly on polystyrene (PS) colloid templates, is used to form catalyst-loaded porous WO3 nanofibers (NFs). The metallic NPs, composed of Au, Pd, or Pt, are encapsulated within a protein cage, i.e., apoferritin, to form unagglomerated monodispersed particles with diameters of less than 5 nm. The catalytic NPs maintain their nanoscale size, even following high-temperature heat-treatment during synthesis, which is attributed to the discrete self-assembly of NPs on PS colloid templates. In addition, the PS templates generate open pores on the electrospun WO3 NFs, facilitating gas molecule transport into the sensing layers and promoting active surface reactions. As a result, the Au and Pd NP-loaded porous WO3 NFs show superior sensitivity toward hydrogen sulfide, as evidenced by responses (R(air)/R(gas)) of 11.1 and 43.5 at 350 °C, respectively. These responses represent 1.8- and 7.1-fold improvements compared to that of dense WO3 NFs (R(air)/R(gas) = 6.1). Moreover, Pt NP-loaded porous WO3 NFs exhibit high acetone sensitivity with response of 28.9. These results demonstrate a novel catalyst loading method, in which small NPs are well-dispersed within the pores of WO3 NFs, that is applicable to high sensitivity breath sensors.

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Section: Morphological and Structural Evaluationmentioning

confidence: 99%

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Choi

Kim

Cho

et al. 2016

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“…In this approach, the metal nanoparticles were attached on the surface of nano‐sized wall of inverse opal, which is relative unstable and uneven distribution on the surface of inverse opal. The co‐assembly method of template microspheres and metallic nanoparticles was used to prepare the inverse opal including metal nanoparticles . However, for the co‐assembly method, the host of inverse opal was mainly focused on the SiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Preparation and photoluminescence enhancement of Au nanoparticles embedded LaPO₄:Eu³⁺ inverse opals

et al. 2018

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In this work, we present a facile preparation approach of Au nanoparticles embedded LaPO4:Eu3+ inverse opal photonic crystals. In the typical preparation process, the transparent LaPO4:Eu3+ sol including HAuCI4 was infiltrated into the opal templates. After the sintering, the 10‐20 nm Au nanoparticles were formed in the interior of nano‐sized wall of LaPO4:Eu3+ inverse opal and the Au nanoparticles embedded LaPO4:Eu3+ inverse opals were obtained. The luminescence of Au nanoparticles embedded LaPO4:Eu3+ inverse opal was investigated. The emission peaks located at the 593 (5D0→7F1), 618 (5D0→7F2) and 698 nm (5D0→7F4) from Eu3+ ions were observed. The 593, 618, and 698 nm emissions of Au nanoparticles embedded LaPO4:Eu3+ inverse opals were enhanced in contrast to these of LaPO4:Eu3+ inverse opal without the Au nanoparticles, which is from the excitation field enhancement caused by the localized surface plasmon resonance of Au nanoparticles.

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“…An effective method for solving low color visibility is to mix black materials with high absorption in the visible light region into colloidal systems to enhance color saturation, because black materials can decrease incoherent scattering, thereby enhancing color [9][10][11][12]. Recently, carbon black (CB) [13][14][15][16], carbon [17,18], carbon-modified colloidal nanospheres [19,20], and metal nanoparticles (NPs) [21][22][23][24][25] of black materials have been used as sdditives in fabricating CPhCs with enhanced structural colors.…”

Section: Introductionmentioning

confidence: 99%

“…Incorporation of a variety of NPs in CPhCs results in the production of brilliant iridescent colors [13][14][15][16][17][18][19][20][21][22][23][24][25] because NPs can absorb and scatter visible light. Gold (Au) NPs and silver (Ag) NPs have been synthesized using the chemical reduction method [26,27] and the facile wet chemical route method [28], respectively.…”

Section: Introductionmentioning

confidence: 99%

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Colloidal Photonic Crystals Containing Silver Nanoparticles with Tunable Structural Colors

Lai

Wang

2016

Crystals

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Polystyrene (PS) colloidal photonic crystals (CPhCs) containing silver nanoparticles (AgNPs) present tunable structural colors. PS CPhC color films containing a high concentration of AgNPs were prepared using self-assembly process through gravitational sedimentation method. High-concentration AgNPs were deposited on the bottom of the substrate and acted as black materials to absorb background and scattering light. Brilliant structural colors were enhanced because of the absorption of incoherent scattering light, and color saturation was increased by the distribution AgNPs on the PS CPhC surfaces. The vivid iridescent structural colors of AgNPs/PS hybrid CPhC films were based on Bragg diffraction and backward scattering absorption using AgNPs. The photonic stop band of PS CPhCs and AgNPs/PS hybrid CPhCs were measured by UV-visible reflection spectrometry and calculated based on the Bragg-Snell law. In addition, the tunable structural colors of AgNPs/PS hybrid CPhC films were evaluated using color measurements according to the Commission International d'Eclairage standard colorimetric system. This paper presents a simple and inexpensive method to produce tunable structural colors for numerous applications, such as textile fabrics, bionic colors, catalysis, and paints.

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Fabrication of Au- and Ag–SiO2 inverse opals having both localized surface plasmon resonance and Bragg diffraction

Cited by 35 publications

References 32 publications

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Preparation and photoluminescence enhancement of Au nanoparticles embedded LaPO₄:Eu³⁺ inverse opals

Colloidal Photonic Crystals Containing Silver Nanoparticles with Tunable Structural Colors

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Fabrication of Au- and Ag–SiO2 inverse opals having both localized surface plasmon resonance and Bragg diffraction

Cited by 35 publications

References 32 publications

WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

WO3 Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Preparation and photoluminescence enhancement of Au nanoparticles embedded LaPO4:Eu3+ inverse opals

Colloidal Photonic Crystals Containing Silver Nanoparticles with Tunable Structural Colors

Contact Info

Product

Resources

About

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

WO₃ Nanofiber-Based Biomarker Detectors Enabled by Protein-Encapsulated Catalyst Self-Assembled on Polystyrene Colloid Templates

Preparation and photoluminescence enhancement of Au nanoparticles embedded LaPO₄:Eu³⁺ inverse opals