Nanofabricated plasmonic nano-bio hybrid structures in biomedical detection

Zheng, Wenwei; Chiamori, Heather C.; Liu, Gang Logan; Lin, Lung–Huang; Chen, Fanqing Frank

doi:10.1515/ntrev-2011-0008

Cited by 18 publications

(10 citation statements)

References 152 publications

(183 reference statements)

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“…The energy of the hot electrons, which is decayed through radiative emission and electrons interactions, results in a photothermal effect. The absorption wavelength of AuNRs mainly depends on the size and aspect ratio [37]. Therefore, in order to obtain AuNRs with absorption near 780 nm to enhance the photo-sensitivity of the photoresist [38], the aspect ratio is controlled at about 4.6.…”

Section: Characterization Of Photothermal Nanomaterialsmentioning

confidence: 99%

Printability of photo-sensitive nanocomposites using two-photon polymerization

Yeung

Dong

Chen

et al. 2020

Nanotechnology Reviews

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AbstractTwo-photon polymerization direct laser writing (TPP DLW) is an emerging technology for producing advanced functional devices with complex three-dimensional (3D) micro-structures. Tremendous efforts have been devoted to developing two-photon polymerizable photo-sensitive nanocomposites with tailored properties. Light-induced reconfigurable smart materials such as liquid crystalline elastomers (LCEs) are promising materials. However, due to the difficulties in designing two-photon polymerizable liquid crystal monomer (LCM) nanocomposite photoresists, it is challenging to fabricate true 3D LCE micro-structures. In this paper, we report the preparation of photo-sensitive LCE nanocomposites containing photothermal nanomaterials, including multiwalled carbon nanotubes, graphene oxide and gold nanorods (AuNRs), for TPP DLW. The printability of the LCE nanocomposites is assessed by the fidelity of the micro-structures under different laser writing conditions. DLW of GO/LCM photoresist has shown a vigorous bubble formation. This may be due to the excessive heat generation upon rapid energy absorption of 780 nm laser energy. Compared to pure LCM photoresists, AuNR/LCM photoresists have a lower laser intensity threshold and higher critical laser scanning speed, due to the high absorption of AuNRs at 780 nm, which enhanced the photo-sensitivity of the photoresist. Therefore, a shorter printing time can be achieved for the AuNR/LCM photoresist.

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Section: Characterization Of Photothermal Nanomaterialsmentioning

confidence: 99%

Printability of photo-sensitive nanocomposites using two-photon polymerization

Yeung

Dong

Chen

et al. 2020

Nanotechnology Reviews

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“…Hybrid nanomaterials receive a great attention from both fundamental and applied point of view due mainly to coupling effects and enhanced properties over the single components. [1][2][3][4][5][6] In this aspect, these materials in which one of the constituents is based on noble metals exhibiting surface plasmon resonance (SPR) response suppose an excellent system for active applications as the heterogeneous catalysis. 1,2,5,7,8 For example, noble nanoparticles (NPs) supported on iron oxides are highly attractive to improve the catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Au(111)/Oxide Epitaxial Heterostructures with Tailoring Plasmonic Response by a One-Step Strategy

et al. 2019

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In this work we present a strategy for developing epitaxial incommensurate nanostructured-Au/oxide heterostructures with tuneable plasmonic response. Previously high quality single phase and oriented α-Fe2O3(0001) thin films were achieved, which have been used as a template for the noble metal epitaxial deposition. The complex systems have been grown by pulsed laser deposition on two different type of oxide substrates: α-Al2O3(0001) and SrTiO3(111). A one-step procedure has been achieved tailoring the isolated character and the morphological features of Au nanostructures through the substrate temperature during the Au growth, without altering the structural characteristics of the hematite layer that is identified as single iron oxide phase. The epitaxial character and the lattice coupling of Au/oxide bilayers are mediated through the sort of oxide substrate. Single oriented Au(111) islands are disposed with a rotation of 30º between their crystallographic axes and those of α-Fe2O3(0001). The Au(111) and SrTiO3(111) lattices are collinear while a rotation of 30º happens respect to the α-Al2O3(0001) lattice. The crystallographic domain size and crystalline order of hematite structure and Au nanostructured-layer are dependent on the substrate type and the Au growth temperature respectively. Besides, the functional character of the complex systems has been tested. The localized surface plasmons related to Au nanostructures are excited and controlled through the fabrication parameters, tuning the optical resonance with the degree of Au nanostructuring.

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“…SERS excitation, in certain wavelength range, and this property is determined by the nature of their metallic nanostructure. Furthermore, as silver nanospheres have been reported providing better enhancement with 532 nm laser than gold nanospheres, 39,40 for the attempt of further boosting the enhancement factor of chip I for current 532 nm laser set up, 50 nm thick silver-film sputtered chip I was also included in the LSPR measurement and FDTD simulation. The LSPR absorbance spectra were measured via an optical set-up using transmission mode (Fig.…”

Section: Electrochemistry (In Press)mentioning

confidence: 99%

SERS Active Hierarchical Nanopillar-huddle Array Fabricated via the Combination of Nanoimprint Lithography and Anodization

et al. 2020

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Metallic nanostructures and their fabrication methods have been studied for over decades as they are crucial in developing plasmonic sensing platforms. In this work, a hierarchical nanopillar huddle structure fabricated by thermal nanoimprint lithography with anodic porous alumina as template is presented. By utilizing this scheme, nanopillars (branches) rooted on regularly deployed substructures (footings) can be easily produced/reproduced for large working area at low-cost with high-throughput. After metal deposition for plasmon activation, tiny nanogaps were generated within each single huddle. The as-fabricated substrates are also tunable by varying the anodizing conditions and metal deposition material/thickness. Substrates produced using this scheme were evaluated by absorption spectra measurements and SERS detection of series of adsorbed molecules. Finite-difference time-domain (FDTD) simulation was conducted to validate the promising feature of the higher electric field energy density stimulated at the tiny nanogaps which resulted in a regular distribution of "hot-spots". Finally, biosensing potentials were demonstrated by conducting measurements of four different nucleotides (i.e. AMP, CMP, TMP, GMP at 10 −2 M) using silver sputtered substrate without any modification. Its SERS performance in the micron level was also evaluated via line-scan in two orthogonal direction in 10 −2 M AMP solution.

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Nanofabricated plasmonic nano-bio hybrid structures in biomedical detection

Cited by 18 publications

References 152 publications

Printability of photo-sensitive nanocomposites using two-photon polymerization

Printability of photo-sensitive nanocomposites using two-photon polymerization

Nanostructured Au(111)/Oxide Epitaxial Heterostructures with Tailoring Plasmonic Response by a One-Step Strategy

SERS Active Hierarchical Nanopillar-huddle Array Fabricated via the Combination of Nanoimprint Lithography and Anodization

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