We described the appearance of complex, patterned structures induced by the buckling of metal thin films owing to thermal contraction on a polymer substrate. Polystyrene(PS) films with thickness of 100 μm were casted...We described the appearance of complex, patterned structures induced by the buckling of metal thin films owing to thermal contraction on a polymer substrate. Polystyrene(PS) films with thickness of 100 μm were casted onto a glass substrate, and the Pt thin films with thickness of 30 nm were deposited onto the polymer surface. The sample films were heated above the glass transition temperature of PS. After cooling to ambient temperature, the disordered wrinkles generated over the whole surface. When we ablated the top metal thin film by laser before heating the polymer, the disordered bucking wrinkles would transfer into ordered ridges pattern. This patterning process is arresting and potentially useful to fabricate optical devices such as diffraction gratings and optical sensors.展开更多
Owing to the potential ability of metal nanoparticles to enhance the performance of energy storage devices,their catalytic performance has been studied by many researchers.However,a limited number of suitable characte...Owing to the potential ability of metal nanoparticles to enhance the performance of energy storage devices,their catalytic performance has been studied by many researchers.However,a limited number of suitable characterization techniques does not allow fully elucidating their catalytic mechanism.Herein,high‐accuracy operando magnetometry is employed to investigate the catalytic properties of a cobalt oxide electrode for lithium‐ion batteries fabricated by magnetron sputtering.Using this technique,the magnetic responses generated by the Co‐catalyzed reversible formation and decomposition of a polymer/gel‐like film are successfully detected.A series of CoO/Co films are prepared by magnetron sputtering in different environments at various sputtering times to study the influence of Co content and film thickness on their catalytic properties.It is clearly demonstrated that increasing the Co content enhances the magnetic signal associated with the catalysis process.Furthermore,decreasing the electrode thickness increases the area affected by the catalytic reactions,which in turn enhances the corresponding magnetic responses.The obtained results experimentally confirm the catalytic activity of Co metal nanoparticles and provide a scientific guidance for designing advanced energy storage devices.This work also shows that operando magnetometry is a versatile technique for studying the catalytic effects of transition metals.展开更多
文摘We described the appearance of complex, patterned structures induced by the buckling of metal thin films owing to thermal contraction on a polymer substrate. Polystyrene(PS) films with thickness of 100 μm were casted onto a glass substrate, and the Pt thin films with thickness of 30 nm were deposited onto the polymer surface. The sample films were heated above the glass transition temperature of PS. After cooling to ambient temperature, the disordered wrinkles generated over the whole surface. When we ablated the top metal thin film by laser before heating the polymer, the disordered bucking wrinkles would transfer into ordered ridges pattern. This patterning process is arresting and potentially useful to fabricate optical devices such as diffraction gratings and optical sensors.
文摘Owing to the potential ability of metal nanoparticles to enhance the performance of energy storage devices,their catalytic performance has been studied by many researchers.However,a limited number of suitable characterization techniques does not allow fully elucidating their catalytic mechanism.Herein,high‐accuracy operando magnetometry is employed to investigate the catalytic properties of a cobalt oxide electrode for lithium‐ion batteries fabricated by magnetron sputtering.Using this technique,the magnetic responses generated by the Co‐catalyzed reversible formation and decomposition of a polymer/gel‐like film are successfully detected.A series of CoO/Co films are prepared by magnetron sputtering in different environments at various sputtering times to study the influence of Co content and film thickness on their catalytic properties.It is clearly demonstrated that increasing the Co content enhances the magnetic signal associated with the catalysis process.Furthermore,decreasing the electrode thickness increases the area affected by the catalytic reactions,which in turn enhances the corresponding magnetic responses.The obtained results experimentally confirm the catalytic activity of Co metal nanoparticles and provide a scientific guidance for designing advanced energy storage devices.This work also shows that operando magnetometry is a versatile technique for studying the catalytic effects of transition metals.
