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RISS 인기검색어
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- 저자 : O. Conde (검색결과 4 건)
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Dual-Color Emissive Upconversion Nanocapsules for Differential Cancer Bioimaging <i>In Vivo</i>
Kwon, Oh Seok,Song, Hyun Seok,Conde, Joã,o,Kim, Hyoung-il,Artzi, Natalie,Kim, Jae-Hong American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>Early diagnosis of tumor malignancy is crucial for timely cancer treatment aimed at imparting desired clinical outcomes. The traditional fluorescence based imaging is unfortunately faced with challenges such as low tissue penetration and background autofluorescence. Upconversion (UC)-based bioimaging can overcome these limitations as their excitation occurs at lower frequencies and the emission at higher frequencies. In this study, multifunctional silica -based nanocapsules were synthesized to encapsulate two distinct triplet triplet annihilation UC chromophore pairs. Each nanocapsule emits different colors, blue or green, following a red light excitation. These nanocapsules were further conjugated with either antibodies or peptides to selectively target breast or colon cancer cells, respectively. Both in vitro and in vivo experimental results herein demonstrate cancer -specific and differential -color imaging from single wavelength excitation as well as far greater accumulation at targeted tumor sites than that due to the enhanced permeability and retention effect. This approach can be used to host a variety of chromophore pairs for various tumor -specific, color -coding scenarios and can be employed for diagnosis of a wide range of cancer types within the heterogeneous tumor microenvironment.</P>
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3D hydrogel scaffold doped with 2D graphene materials for biosensors and bioelectronics
Song, Hyun Seok,Kwon, Oh Seok,Kim, Jae-Hong,Conde, Joã,o,Artzi, Natalie Elsevier 2017 Biosensors & bioelectronics Vol.89 No.1
<P><B>Abstract</B></P> <P>Hydrogels consisting of three-dimensional (3D) polymeric networks have found a wide range of applications in biotechnology due to their large water capacity, high biocompatibility, and facile functional versatility. The hydrogels with stimulus-responsive swelling properties have been particularly instrumental to realizing signal transduction in biosensors and bioelectronics. Graphenes are two-dimensional (2D) nanomaterials with unprecedented physical, optical, and electronic properties and have also found many applications in biosensors and bioelectronics. These two classes of materials present complementary strengths and limitations which, when effectively coupled, can result in significant synergism in their electrical, mechanical, and biocompatible properties. This report reviews recent advances made with hydrogel and graphene materials for the development of high-performance bioelectronics devices. The report focuses on the interesting intersection of these materials wherein 2D graphenes are hybridized with 3D hydrogels to develop the next generation biosensors and bioelectronics.</P> <P><B>Highlights</B></P> <P> <UL> <LI> This review discusses how 3D hydrogel platforms can be doped with 2D materials like graphene for biosensing and bioelectronics applications. </LI> <LI> This review illustrates novel concepts in the application of hydrogels and graphenes as excellent optical and electrical biosensors. </LI> <LI> This review also provides a future perspective about using Hydrogel-graphene hybrids as supercapacitors and injectable biosensors. </LI> </UL> </P>
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Phase growth control in low temperature PLD Co:TiO2 films by pressure
S. Rout,N. Popovici,S. Dalui,M.L. Paramês,R.C. da Silva,A.J. Silvestre,O. Conde 한국물리학회 2013 Current Applied Physics Vol.13 No.4
This paper reports on the structural and optical properties of Co-doped TiO2 thin films grown onto (0001)Al2O3 substrates by non-reactive pulsed laser deposition (PLD) using argon as buffer gas. It is shown that by keeping constant the substrate temperature at as low as 310 C and varying only the background gas pressure between 7 Pa and 70 Pa, it is possible to grow either epitaxial rutile or pure anatase thin films, as well as films with a mixture of both polymorphs. The optical band gaps of the films are red shifted in comparison with the values usually reported for undoped TiO2, which is consistent with n-type doping of the TiO2 matrix. Such band gap red shift brings the absorption edge of the Codoped TiO2 films into the visible region, which might favour their photocatalytic activity. Furthermore,the band gap red shift depends on the films’ phase composition, increasing with the increase of the Urbach energy for increasing rutile content.
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Co and (Co,Mo) doping effects on the properties of highly reduced TiO2 anatase thin films
A.J. Silvestr,S. Rout,S. Dalui,L.C.J. Pereira,A.S. Viana,O. Conde 한국물리학회 2017 Current Applied Physics Vol.17 No.2
This work reports on the structural, optical, electrical and magnetic properties of Co:TiO2 and (Co,Mo):TiO2 anatase thin films grown onto (0001) sapphire substrates by Pulsed Laser Deposition in highly reducing conditions and at a low temperature of 350 C. Undoped TiO2d as well as doped films with nominal compositions of Ti0.95Co0.05O2d, Ti0.94Co0.05Mo0.01O2d, and Ti0.92Co0.05Mo0.03O2d were studied. They all show similar microstructures, with smooth surfaces and RMS roughness values less than 0.5 nm. The optical band gap energies of the doped films are red shifted with respect to that deduced for the undoped TiO2d. The correlation between the band gaps and the Urbach energies of the films is discussed. All samples show semiconductor behavior with n-type conduction. The Co:TiO2 sample is ferromagnetic with a saturation magnetization of 1.3 mB/Co, a high electrical conductivity of 123 S cm1 and a carrier density of 1.88 1021 cm3 at room temperature. The ferromagnetic order of the Co:TiO2 system is suppressed when carriers are added by codoping with Mo.
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