Luminescence probing of organically modified sol-gel thin films for sensing applications

1997 ◽  
Author(s):  
Michael T. Murtagh ◽  
Hyeog-Chan Kwon ◽  
Mahmoud R. Shahriari
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Sensing Applications ◽  
Organically Modified

Sol–gel cobalt oxide–silica nanocomposite thin films for gas sensing applications

2008 ◽  
Vol 516 (7) ◽  
pp. 1499-1502 ◽  
Author(s):  
V. Musat ◽  
E. Fortunato ◽  
A.M. Botelho do Rego ◽  
R. Monteiro
Keyword(s):  
Thin Films ◽  
Cobalt Oxide ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications ◽  
Nanocomposite Thin Films ◽  
Silica Nanocomposite

Interactions Between Chemical Functionality and Nanoscale Surface Topography Impact Fibronectin Conformation and Neuronal Differentiation on Model Sol-gel Silica Substrates

2006 ◽  
Vol 950 ◽  
Author(s):  
Sabrina Jedlicka ◽  
Silas J. Leavesley ◽  
Kenneth M Little ◽  
J. Paul Robinson ◽  
David E. Nivens ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Topography ◽  
Neuronal Differentiation ◽  
Sol Gel ◽  
Silica Gels ◽  
Bulk Materials ◽  
Surface Features ◽  
Ecm Proteins ◽  
Organically Modified ◽  
Chemical Functionality

ABSTRACTFunctional relationships between the biomaterial interface and extracellular matrix (ECM) proteins are intimately involved in cellular adhesion and function. Structural changes of ECM proteins upon adsorption to a surface alter the protein's biological activity by varying the availability of molecular binding sites. Recent work using native and organically modified sol-gel silica as a neuronal biointerface revealed that changes in surface nanotopography of bulk versus thin film materials result in dramatic differences in fibronectin structure, cell survival, and neuronal differentiation. In order to further investigate interactions between chemical functionality and surface topography, we evaluated the global conformation of human fibronectin adsorbed to seven different organically modified silica gels and thin films. Chemical functional groups were introduced into the materials either by altering the starting precursor or by doping with poly-l-lysine or polyethylenimine. Surface topography measurements by atomic force microscopy show that films have surface features less than 25 nm while bulk materials of the same precursor chemistry have features ranging from 50 – 100 nm in size. Fluorescence resonance energy transfer spectroscopy (FRET) revealed a strong interaction between surface topography and chemical functionality. Fibronectin remain globular on all bulk materials regardless of chemical modification. The same changes in precursors or dopant chemistry, however, induced changes in the conformation of fibronectin on the thin films. The differentiation of PC12 cells on the surface indicated a strong impact of the surface features and suggest a possible optimal fibronectin folding state.

Effect of sol–gel hydrophobicity on the distribution and structure of different proteins in organically modified sol–gel thin films

2009 ◽  
Vol 52 (3) ◽  
pp. 370-381 ◽  
Author(s):  
Dominik L. Jürgen-Lohmann ◽  
Christoph Nacke ◽  
Leonardo C. Simon ◽  
Raymond L. Legge
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Organically Modified

Nanostructured sol–gel silica thin films doped with NiO and SnO2for gas sensing applications

2004 ◽  
Vol 14 (19) ◽  
pp. 2889-2895 ◽  
Author(s):  
Alessandro Martucci ◽  
Dario Buso ◽  
Matthias De Monte ◽  
Massimo Guglielmi ◽  
Carlo Cantalini ◽  
...  
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Sensing Applications ◽  
Silica Thin Films

scholarly journals Conductometric assisted ZnO and polypyrole composite based NH3 gas sensor

2021 ◽  
Author(s):  
AJAY PRATAP SINGH GAHLOT ◽  
Ayushi Paliwal ◽  
Avinashi Kapoor
Keyword(s):  
Thin Films ◽  
Gas Sensing ◽  
Sol Gel ◽  
Morphological Properties ◽  
Response Characteristics ◽  
Glass Substrates ◽  
Sensing Applications ◽  
Gel Technique ◽  
Digital Transducers ◽  
Polypyrrole Composite

Abstract Metal oxides are excellent choices as base materials in emerging technologies in the field of Gas Sensors. In this work, an effort is made to prepare the ZnO and polypyrrole composite thin film using sol-gel technique. Nanocomposite thins film was prepared using spin coating on glass substrates for ammonia gas sensing. ZnO and polypyrrole sols were prepared using sol-gel technique and thin films were prepared by using spin coater. The nanocomposite thin films were prepared by varying the percentage composition of ZnO and Polypyrrole. Structural, optical and morphological properties of the prepared films were done using XRD, UV-Visible and SEM studies. The films were separately prepared on Inter-Digital Transducers for gas sensing applications. Gas sensing response characteristics of the prepared sensor were performed using laboratory. The sensing response of the prepared films is observed and found to be maximum (~33) for the 70%PPy+30%ZnO film at a relatively low operating temperature of about 150°C.

Formation of Vanadium Oxide Thin Films Prepared from Aqueous Sol-Gel System

2014 ◽  
Vol 605 ◽  
pp. 79-82 ◽  
Author(s):  
Olivier Monfort ◽  
Tomas Roch ◽  
Maros Gregor ◽  
Leonid Satrapinskyy ◽  
Tomas Plecenik ◽  
...  
Keyword(s):  
Thin Films ◽  
Vanadium Oxide ◽  
Spin Coating ◽  
Gas Sensing ◽  
Sol Gel ◽  
Oxide Thin Films ◽  
Glass Substrates ◽  
Sensing Applications ◽  
Vanadium Oxide Thin Films ◽  
Deposited Films

Vanadium oxide thin films are promising materials for various applications. Much attention has been devoted to thermotropic VO2(M/R) films which exhibit semiconductor-conductor phase transition at 67 °C making them excellent materials for switching applications. Non-thermotropic VO2(B) films are semiconducting and have layered structure which makes them interesting for gas sensing applications. Vanadium pentoxide films are also of great interest for photocatalytic production of H2by H2O decomposition as well as for gas sensing. In this paper the preparation of vanadium oxide thin films by using the spin coating of V2O5·nH2O aqueous gel on Si/SiO2and lime-glass substrates is reported. The as-deposited films were annealed in either air or H2/Ar atmosphere at normal or low pressure in order to prepare V2O5and VO2thin films. The obtained samples were characterized by XRD and SEM.

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