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Wang G, Huang L. Sensitivity enhancement of a silver based surface plasmon resonance sensor via an optimizing graphene-dielectric composite structure. APPLIED OPTICS 2022; 61:683-690. [PMID: 35200772 DOI: 10.1364/ao.446579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
A silver based surface plasmon resonance (SPR) sensor with dielectric-graphene composite film is presented. The influences of the dielectric layer and graphene on sensitivity and other sensing properties are theoretically calculated and then comprehensively discussed. The refractive index sensitivities for composite silver film based SPR sensors with graphene and dielectric layers could be increased by 29% and 288% more than that of monolayer silver film based SPR sensors, respectively. Further, the sensitivity could be enhanced by 202% when combining the graphene and dielectric layers together. Considering the high adsorptive capacity of graphene for biochemical molecules, the composite silver film with both a dielectric layer and graphene would have great potential application in biochemical sensing fields. Further, bovine serum albumin protein was successfully used to verify the biochemical sensing ability of the proposed SPR sensor. The shift of resonance angle is nearly 3.1 fold that of monolayer silver based SPR sensors.
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Li Z, He Y, Klausen LH, Yan N, Liu J, Chen F, Song W, Dong M, Zhang Y. Growing vertical aligned mesoporous silica thin film on nanoporous substrate for enhanced degradation, drug delivery and bioactivity. Bioact Mater 2021; 6:1452-1463. [PMID: 33251381 PMCID: PMC7670213 DOI: 10.1016/j.bioactmat.2020.10.026] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 10/28/2020] [Accepted: 10/28/2020] [Indexed: 12/18/2022] Open
Abstract
Mesoporous silica thin film has been widely used in various fields, particularly the medical implant coating for drug delivery. However, some drawbacks remain with the films produced by traditional method (evaporation-induced self-assembly, EISA), such as the poor permeability caused by their horizontal aligned mesochannels. In this study, the vertical aligned mesoporous silica thin film (VMSTF) is uniformly grown alongside the walls of titania nanotubes array via a biphase stratification growth method, resulting in a hierarchical two-layered nanotubular structure. Due to the exposure of opened mesopores, VMSTF exhibits more appealing performances, including rapid degradation, efficient small-molecular drug (dexamethasone) loading and release, enhanced early adhesion and osteogenic differentiation of MC3T3-E1 cells. This is the first time successfully depositing VMSTF on nanoporous substrate and our findings suggest that the VMSTF may be a promising candidate for bone implant surface coating to obtain bioactive performances.
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Key Words
- ALP, alkaline phosphatase
- DEX, dexamethasone
- Drug delivery
- HAP, hydroxylapatite nanoparticles
- HMSTF, hybrid organic-inorganic MSTF
- MSTF, mesoporous silica thin film
- Mesoporous silica film
- OCN, osteocalcin
- OPN, osteopontin
- Osteoblasts
- PMSTF, parallel aligned MSTF
- PT, polished titanium
- RUNX2, runt-related transcription factor 2
- TNN, titania nanonet
- TNT, titania nanotube
- Titania nanotubes array
- Ti–OH, hydroxylated titanium
- VMSTF, vertical aligned MSTF
- Vertical aligned mesochannels
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Affiliation(s)
- Zhe Li
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Yide He
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | | | - Ning Yan
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Jing Liu
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Fanghao Chen
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Wen Song
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
| | - Mingdong Dong
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Aarhus, 8000, Denmark
| | - Yumei Zhang
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Key Laboratory of Oral Diseases, Department of Prosthodontics, School of Stomatology, The Fourth Military Medical University, Xi'an, 710032, China
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Fabrication of Metallochromic Dye Functionalized Hydrogel for On-site, Fast, User-friendly Metal-ion Sensing Kit. Macromol Res 2020. [DOI: 10.1007/s13233-020-8074-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Wang G, Sun S. Fabrication of a mesoporous silica film based optical waveguide sensor for detection of small molecules. APPLIED OPTICS 2020; 59:3933-3941. [PMID: 32400663 DOI: 10.1364/ao.389118] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
In this paper, a thick mesoporous silica film (MSF) (more than 700 nm) was fabricated via the two-step enhancing Stöber solution growth approach (ESSGA). According to the optimization based on the transfer matrix method, a thicker MSF sensor has higher waveguide index sensitivity and is more suitable for the adsorbent detection, while a thinner MSF sensor has higher covered medium index sensitivity and is more appropriate for non-adsorbent detection. The covered medium index sensitivity and refractive index resolution of the fabricated MSF optical waveguide sensor were calculated to be 53.18 deg/RIU and ${1.28}\; \times \;{{10}^{ - 6}}\;{\rm RIU}$1.28×10-6RIU, respectively. For the detection of a small molecule, hexadecyltrimethylammonium bromide was used as a model of a small molecule to verify its sensing property and its limit of detection (LOD) as low as 1.879 nM was obtained. In order to detect heavy metal ions, the MSF was modified with an amino group by the post-grafted method. The response of the resonance angle shift is more sensitive to ${{\rm Pb}^{2 + }}$Pb2+ ion than ${{\rm Cu}^{2 + }}$Cu2+ ion and both their LODs could reach the nanomolar detection level; those are 17.30 and 6.44 nM, respectively.
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Knoll W, Azzaroni O, Duran H, Kunze-Liebhäuser J, Lau KHA, Reimhult E, Yameen B. Nanoporous thin films in optical waveguide spectroscopy for chemical analytics. Anal Bioanal Chem 2020; 412:3299-3315. [PMID: 32107572 PMCID: PMC7214501 DOI: 10.1007/s00216-020-02452-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Revised: 01/03/2020] [Accepted: 01/23/2020] [Indexed: 01/02/2023]
Abstract
Spectroscopy with planar optical waveguides is still an active field of research for the quantitative analysis of various supramolecular surface architectures and processes, and for applications in integrated optical chip communication, direct chemical sensing, etc. In this contribution, we summarize some recent development in optical waveguide spectroscopy using nanoporous thin films as the planar substrates that can guide the light just as well as bulk thin films. This is because the nanoporosity is at a spacial length-scale that is far below the wavelength of the guided light; hence, it does not lead to an enhanced scattering or additional losses of the optical guided modes. The pores have mainly two effects: they generate an enormous inner surface (up to a factor of 100 higher than the mere geometric dimensions of the planar substrate) and they allow for the exchange of material and charges between the two sides of the solid thin film. We demonstrate this for several different scenarios including anodized aluminum oxide layers for the ultrasensitive determination of the refractive index of fluids, or the label-free detection of small analytes binding from the pore inner volume to receptors immobilized on the pore surface. Using a thin film of Ti metal for the anodization results in a nanotube array offering an even further enhanced inner surface and the possibility to apply electrical potentials via the resulting TiO2 semiconducting waveguide structure. Nanoporous substrates fabricated from SiNx thin films by colloid lithography, or made from SiO2 by e-beam lithography, will be presented as examples where the porosity is used to allow for the passage of ions in the case of tethered lipid bilayer membranes fused on top of the light-guiding layer, or the transport of protons through membranes used in fuel cell applications. The final example that we present concerns the replication of the nanopore structure by polymers in a process that leads to a nanorod array that is equally well suited to guide the light as the mold; however, it opens a totally new field for integrated optics formats for direct chemical and biomedical sensing with an extension to even molecularly imprinted structures. Graphical abstract.
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Affiliation(s)
- Wolfgang Knoll
- Competence Centre for Electrochemical Surface Technology, 2700, Wiener Neustadt, Austria.
- AIT Austrian Institute of Technology GmbH, 3430, Tulln an der Donau, Austria.
| | - Omar Azzaroni
- Competence Centre for Electrochemical Surface Technology, 2700, Wiener Neustadt, Austria
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de LaPlata - CONICET, 1900, La Plata, Argentina
| | - Hatice Duran
- Department of Materials Science and Nanotechnology Engineering, TOBB University of Economics and Technology, 06560, Ankara, Turkey
| | - Julia Kunze-Liebhäuser
- Institute for Physical Chemistry, Leopold-Franzens-Universität Innsbruck, 6020, Innsbruck, Austria
| | - King Hang Aaron Lau
- Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow, G1 1XL, UK
| | - Erik Reimhult
- Department of Nanobiotechnology, University of Natural Resources and Life Sciences, 1190, Vienna, Austria
| | - Basit Yameen
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science and Engineering, Lahore University of Management Sciences, Lahore, 54762, Pakistan
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Wang W, Dong W, Tian G, Sun L, Wang Q, Hui A, Mu B, Wang A. Highly efficient self-template synthesis of porous silica nanorods from natural palygorskite. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.05.075] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Sreekanth KV, Dong W, Ouyang Q, Sreejith S, ElKabbash M, Lim CT, Strangi G, Yong KT, Simpson RE, Singh R. Large-Area Silver-Stibnite Nanoporous Plasmonic Films for Label-Free Biosensing. ACS APPLIED MATERIALS & INTERFACES 2018; 10:34991-34999. [PMID: 30226753 DOI: 10.1021/acsami.8b14370] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The development of various plasmonic nanoporous materials has attracted much interest in different areas of research including bioengineering and biosensing because of their large surface area and versatile porous structure. Here, we introduce a novel technique for fabricating silver-stibnite nanoporous plasmonic films. Unlike conventional techniques that are usually used to fabricate nanoporous plasmonic films, we use a room-temperature growth method that is wet-chemistry free, which enables wafer-scale fabrication of nanoporous films on flexible substrates. We show the existence of propagating surface plasmon polaritons in nanoporous films and demonstrate the extreme bulk refractive index sensitivity of the films using the Goos-Hänchen shift interrogation scheme. In the proof-of-concept biosensing experiments, we functionalize the nanoporous films with biotin-thiol using a modified functionalization technique, to capture streptavidin. The fractal nature of the films increases the overlap between the local field and the immobilized biomolecules. The extreme sensitivity of the Goos-Hänchen shift allows femtomolar concentrations of streptavidin to be detected in real time, which is unprecedented using surface plasmons excited via the Kretschmann configuration.
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Affiliation(s)
- Kandammathe Valiyaveedu Sreekanth
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , Singapore 637371
- Centre for Disruptive Photonic Technologies , The Photonic Institute , 50 Nanyang Avenue , Singapore 639798
| | - Weiling Dong
- Singapore University of Technology and Design, 8 Somapah Road , Singapore 487372
| | - Qingling Ouyang
- School of Electrical and Electronic Engineering , Nanyang Technological University , Singapore 639798
- CINTRA CNRS/NTU/THALES, UMI 3288, Research Techno Plaza , Nanyang Technological University , 50 Nanyang Drive , Singapore 637553
| | - Sivaramapanicker Sreejith
- Biomedical Institute for Global Health Research and Technology , National University of Singapore , Singapore 117599
| | - Mohamed ElKabbash
- Department of Physics , Case Western Reserve University , 10600 Euclid Avenue , Cleveland , Ohio 44106 , United States
| | - Chwee Teck Lim
- Biomedical Institute for Global Health Research and Technology , National University of Singapore , Singapore 117599
- Department of Biomedical engineering , National University of Singapore , Singapore 117583
| | - Giuseppe Strangi
- Department of Physics , Case Western Reserve University , 10600 Euclid Avenue , Cleveland , Ohio 44106 , United States
- Department of Physics and CNR-NANOTEC UOS of Cosenza , Licryl Laboratory, University of Calabria , 87036 Rende , Italy
| | - Ken-Tye Yong
- School of Electrical and Electronic Engineering , Nanyang Technological University , Singapore 639798
| | - Robert E Simpson
- Singapore University of Technology and Design, 8 Somapah Road , Singapore 487372
| | - Ranjan Singh
- Division of Physics and Applied Physics, School of Physical and Mathematical Sciences , Nanyang Technological University , 21 Nanyang Link , Singapore 637371
- Centre for Disruptive Photonic Technologies , The Photonic Institute , 50 Nanyang Avenue , Singapore 639798
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Cong VT, Gaus K, Tilley RD, Gooding JJ. Rod-shaped mesoporous silica nanoparticles for nanomedicine: recent progress and perspectives. Expert Opin Drug Deliv 2018; 15:881-892. [PMID: 30173560 DOI: 10.1080/17425247.2018.1517748] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
INTRODUCTION Interest in mesoporous silica nanoparticles for drug delivery has resulted in a good understanding of the impact of size and surface chemistry of these nanoparticles on their performance as drug carriers. Shape has emerged as an additional factor that can have a significant effect on delivery efficacy. Rod-shaped mesoporous silica nanoparticles show improvements in drug delivery relative to spherical mesoporous silica nanoparticles. AREAS COVERED This review summarises the synthesis methods for producing rod-shaped mesoporous silica nanoparticles for use in nanomedicine. The second part covers recent progress of mesoporous silica nanorods by comparing the impact of sphere and rod-shape on drug delivery efficiency. EXPERT OPINION As hollow mesoporous silica nanorods are capable of higher drug loads than most other drug delivery vehicles, such particles will reduce the amount of mesoporous silica in the body for efficient therapy. However, the importance of nanoparticle shape on drug delivery efficiency is not well understood for mesoporous silica. Studies that visualize and quantify the uptake pathway of mesoporous silica nanorods in specific cell types and compare the cellular uptake to the well-studied nanospheres should be the focus of research to better understand the role of shape in uptake.
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Affiliation(s)
- Vu Thanh Cong
- a School of Chemistry, Australian of NanoMedicine and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , University of New South Wales , Sydney , Australia
| | - Katharina Gaus
- b EMBL Australia Node in Single Molecule Science and ARC Centre of Excellence in Advanced Molecular Imaging , University of New South Wales , Sydney , Australia
| | - Richard D Tilley
- a School of Chemistry, Australian of NanoMedicine and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , University of New South Wales , Sydney , Australia
| | - J Justin Gooding
- a School of Chemistry, Australian of NanoMedicine and ARC Centre of Excellence in Convergent Bio-Nano Science and Technology , University of New South Wales , Sydney , Australia
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A Sensitive and Stable Surface Plasmon Resonance Sensor Based on Monolayer Protected Silver Film. SENSORS 2017; 17:s17122777. [PMID: 29189753 PMCID: PMC5751622 DOI: 10.3390/s17122777] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Revised: 11/08/2017] [Accepted: 11/14/2017] [Indexed: 12/21/2022]
Abstract
In this paper, we present a stable silver-based surface plasmon resonance (SPR) sensor using a self-assembled monolayer (SAM) as a protection layer and investigated its efficiency in water and 0.01 M phosphate buffered saline (PBS). By simulation, silver-based SPR sensor has a better performance in field enhancement and penetration depth than that of a gold-based SPR sensor, which are 5 and 1.4 times, respectively. To overcome the instability of the bare silver film and investigate the efficiency of the protected layer, the SAM of 11-mercapto-1-undecanol (MUD) was used as a protection layer. Stability experiment results show that the protected silver film exhibited excellent stability either in pure water or 0.01 M PBS buffer. The sensitivity of the silver-based SPR sensor was calculated to be 127.26 deg/RIU (refractive index unit), measured with different concentrations of NaCl solutions. Further, a very high refractive resolution for the silver-based SPR sensor was found to be 2.207 × 10−7 RIU, which reaches the theoretical limit in the wavelength of 632.8 nm for a SPR sensor reported in the literature. Using a mixed SAM of 16-mercaptohexadecanoic acid (MHDA) and a MUD layer with a ratio of 1:10, this immunosensor for the rabbit immunoglobulin G (IgG) molecule with a limit of detection as low as 22.516 ng/mL was achieved.
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Visser D, Choudhury BD, Krasovska I, Anand S. Refractive index sensing in the visible/NIR spectrum using silicon nanopillar arrays. OPTICS EXPRESS 2017; 25:12171-12181. [PMID: 28786575 DOI: 10.1364/oe.25.012171] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Accepted: 04/03/2017] [Indexed: 06/07/2023]
Abstract
Si nanopillar (NP) arrays are investigated as refractive index sensors in the visible/NIR wavelength range, suitable for Si photodetector responsivity. The NP arrays are fabricated by nanoimprint lithography and dry etching, and coated with thin dielectric layers. The reflectivity peaks obtained by finite-difference time-domain (FDTD) simulations show a linear shift with coating layer thickness. At 730 nm wavelength, sensitivities of ~0.3 and ~0.9 nm/nm of SiO2 and Si3N4, respectively, are obtained; and the optical thicknesses of the deposited surface coatings are determined by comparing the experimental and simulated data. The results show that NP arrays can be used for sensing surface bio-layers. The proposed method could be useful to determine the optical thickness of surface coatings, conformal and non-conformal, in NP-based optical devices.
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