A tremendous variation in electrical resistance, from the semiconductor to metallic range, has be... more A tremendous variation in electrical resistance, from the semiconductor to metallic range, has been observed in titania nanotube arrays at room temperature, approximately 25 degrees C, in the presence of < or = 1000 ppm hydrogen gas. The nanotube arrays are fabricated by anodizing titanium foil in an aqueous electrolyte solution containing hydrofluoric acid and acetic acid. Subsequently, the arrays are coated with a 10 nm layer of palladium by evaporation. Electrical contacts are made by sputtering a 2 mm diameter platinum disk atop the Pd-coated nanotube array. These sensors exhibit a resistance variation of the order of 10(4) in the presence of 100 ppm hydrogen at 25 degrees C. The sensors demonstrate complete reversibility, repeatability, high selectivity, negligible drift and wide dynamic range. The nanoscale geometry of the nanotubes, in particular the points of tube-to-tube contact, is believed to be responsible for the outstanding hydrogen gas sensitivities.
... Maggie Paulose SenTech Corporation, 200 Innovation Boulevard, State College, Pennsylvania 168... more ... Maggie Paulose SenTech Corporation, 200 Innovation Boulevard, State College, Pennsylvania 16803 Oomman K. Varghese, GK Mor, and Craig A. Grimesa ... deposition,1 colloidal chemistry,11 and poly-mer-templating7 have been used to fabricate tungsten ox-ide thin films ...
Using anodic oxidation with a time-dependent linearly varying anodization voltage, we have made f... more Using anodic oxidation with a time-dependent linearly varying anodization voltage, we have made films of tapered, conical-shaped titania nanotubes. The tapered, conical-shaped nanotubes were obtained by anodizing titanium foil in a 0.5% hydrofluoric acid electrolyte, with the ...
... MUKHERJEE, NILOY. Display Full Text | Download Full Text 7.58 MB PDF file. ... Small angle x-... more ... MUKHERJEE, NILOY. Display Full Text | Download Full Text 7.58 MB PDF file. ... Small angle x-ray scattering studies revealed the the lamellae are not perpendicular to the machine direction, but make an angle with all the film axes. ...
... Siddharth V. Patwardhan, Niloy Mukherjee & Stephen J. Clarson1 Depart... more ... Siddharth V. Patwardhan, Niloy Mukherjee & Stephen J. Clarson1 Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, USA 1Author for correspondence (e-mail: sclarson@uceng.uc.edu) ... X-Ray Diffraction Analysis (XRD) ...
A tremendous variation in electrical resistance, from the semiconductor to metallic range, has be... more A tremendous variation in electrical resistance, from the semiconductor to metallic range, has been observed in titania nanotube arrays at room temperature, approximately 25 degrees C, in the presence of < or = 1000 ppm hydrogen gas. The nanotube arrays are fabricated by anodizing titanium foil in an aqueous electrolyte solution containing hydrofluoric acid and acetic acid. Subsequently, the arrays are coated with a 10 nm layer of palladium by evaporation. Electrical contacts are made by sputtering a 2 mm diameter platinum disk atop the Pd-coated nanotube array. These sensors exhibit a resistance variation of the order of 10(4) in the presence of 100 ppm hydrogen at 25 degrees C. The sensors demonstrate complete reversibility, repeatability, high selectivity, negligible drift and wide dynamic range. The nanoscale geometry of the nanotubes, in particular the points of tube-to-tube contact, is believed to be responsible for the outstanding hydrogen gas sensitivities.
... Maggie Paulose SenTech Corporation, 200 Innovation Boulevard, State College, Pennsylvania 168... more ... Maggie Paulose SenTech Corporation, 200 Innovation Boulevard, State College, Pennsylvania 16803 Oomman K. Varghese, GK Mor, and Craig A. Grimesa ... deposition,1 colloidal chemistry,11 and poly-mer-templating7 have been used to fabricate tungsten ox-ide thin films ...
Using anodic oxidation with a time-dependent linearly varying anodization voltage, we have made f... more Using anodic oxidation with a time-dependent linearly varying anodization voltage, we have made films of tapered, conical-shaped titania nanotubes. The tapered, conical-shaped nanotubes were obtained by anodizing titanium foil in a 0.5% hydrofluoric acid electrolyte, with the ...
... MUKHERJEE, NILOY. Display Full Text | Download Full Text 7.58 MB PDF file. ... Small angle x-... more ... MUKHERJEE, NILOY. Display Full Text | Download Full Text 7.58 MB PDF file. ... Small angle x-ray scattering studies revealed the the lamellae are not perpendicular to the machine direction, but make an angle with all the film axes. ...
... Siddharth V. Patwardhan, Niloy Mukherjee & Stephen J. Clarson1 Depart... more ... Siddharth V. Patwardhan, Niloy Mukherjee & Stephen J. Clarson1 Department of Materials Science and Engineering, University of Cincinnati, Cincinnati, OH 45221-0012, USA 1Author for correspondence (e-mail: sclarson@uceng.uc.edu) ... X-Ray Diffraction Analysis (XRD) ...
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