The microstructure and magnetic properties of Mn-doped ZnO films with various Mn contents,synthesized by magnetron sputtering at room temperature,are investigated in detail.X-ray diffraction(XRD) measurement results s...The microstructure and magnetic properties of Mn-doped ZnO films with various Mn contents,synthesized by magnetron sputtering at room temperature,are investigated in detail.X-ray diffraction(XRD) measurement results suggest that the doped Mn ions occupy the Zn sites successfully and do not change the crystal structure of the ZnO films.However,the microstructure of the Mn-doped ZnO films apparently changes with increasing the Mn concentration.Arrays of well-aligned nanoscale rods are found in the Mn-doped ZnO films with moderate Mn concentrations.Magnetic measurement results indicate that the ZnO films doped with moderate Mn concentration are ferromagnetic at room temperature.The possible origin of the ferromagnetism in our samples is also explored in detail.展开更多
SnO_(2)-ZnO thin films consisting of nanoscale crystallites were obtained on glass and silicon substrates by solid-phase low-temperature pyrolysis.The synthesized materials were studied by XRD and SEM methods,electrop...SnO_(2)-ZnO thin films consisting of nanoscale crystallites were obtained on glass and silicon substrates by solid-phase low-temperature pyrolysis.The synthesized materials were studied by XRD and SEM methods,electrophysical and optical properties were evaluated,as well as the band gap was calculated.It was shown that regardless of the phase composition all films were optically transparent in the visible range(310-1000 nm).The nanocrystallites’minimum size,the highest activation energy of the conductivity and the smallest band gap calculated for indirect transitions were shown for a thin film 50SnO_(2)-50ZnO.It was assumed that the band gap decreasing might be attributed to the existence of surface electric fields with a strength higher than 4×10^(5)V/cm.展开更多
Comprehensive Summary,The worldwide abuse of antibiotics and resultant antimicrobial resistance made the development of new antibacterial materials an urgent and significant issue.Herein,a hybrid ZnO@Au nanorod array ...Comprehensive Summary,The worldwide abuse of antibiotics and resultant antimicrobial resistance made the development of new antibacterial materials an urgent and significant issue.Herein,a hybrid ZnO@Au nanorod array with fast bacterial inactivation and excellent recyclability was reported.93%bacteria could be inactivated within 5 min ultra-sonication under indoor daylight,and the killing rate maintains above 90%after seven repeated using cycles.Antibacterial mechanism involves extracellular reactive oxygen species(ROS)generated from photocatalysis and piezoelectricity of nanorod array,intracellular ROS generation and decrease of adenosine-triphosphate(ATP)originated from electron transfer(ET)from bacteria to nanorod array,as well as mechanical effect from the nanorod,among which ET mechanism plays a major role.Large Schottky barrier from the hybrid interface not only enhances the ROS generation by promoting the charge transfer and carrier separation as well as light utilization,but also enables one-direction electron transfer from bacteria to nanorod array.The resultant continuous electron loss breaks the energy metabolism and disturbs the redox equilibrium,leading to bacterial death.This study demonstrates the great potential of hybrid structure in antibacterial applications and indicates ET as a novel effective antibacterial mechanism for semiconductor materials,which provides insights into the design of next-generation antibacterial materials.展开更多
基金supported by the National Natural Science Foundation of China(Nos.11204266 and 21276220)the Nature Science Foundation of Jiangsu Province(No.BK20141262)
文摘The microstructure and magnetic properties of Mn-doped ZnO films with various Mn contents,synthesized by magnetron sputtering at room temperature,are investigated in detail.X-ray diffraction(XRD) measurement results suggest that the doped Mn ions occupy the Zn sites successfully and do not change the crystal structure of the ZnO films.However,the microstructure of the Mn-doped ZnO films apparently changes with increasing the Mn concentration.Arrays of well-aligned nanoscale rods are found in the Mn-doped ZnO films with moderate Mn concentrations.Magnetic measurement results indicate that the ZnO films doped with moderate Mn concentration are ferromagnetic at room temperature.The possible origin of the ferromagnetism in our samples is also explored in detail.
基金This work was financially supported by the RFBR,project 20-07-00653 A.The authors are grateful to the Molecular Spectroscopy Center of Southern Federal University for the registration of spectra.
文摘SnO_(2)-ZnO thin films consisting of nanoscale crystallites were obtained on glass and silicon substrates by solid-phase low-temperature pyrolysis.The synthesized materials were studied by XRD and SEM methods,electrophysical and optical properties were evaluated,as well as the band gap was calculated.It was shown that regardless of the phase composition all films were optically transparent in the visible range(310-1000 nm).The nanocrystallites’minimum size,the highest activation energy of the conductivity and the smallest band gap calculated for indirect transitions were shown for a thin film 50SnO_(2)-50ZnO.It was assumed that the band gap decreasing might be attributed to the existence of surface electric fields with a strength higher than 4×10^(5)V/cm.
基金supported by the Youth Innovation Promotion Association of CAS(Grant No.2020233)the National Natural Science Foundation of China(22074138)+2 种基金the National Science Fund for Distinguished Young Scholars(22025406)the Science and Technology Innovation Foundation of Jjilin Province(YDZJ202101ZYTS039,20220101065JC)Liaoning Provincial Department of Education Fund(UJKMz20220790).
文摘Comprehensive Summary,The worldwide abuse of antibiotics and resultant antimicrobial resistance made the development of new antibacterial materials an urgent and significant issue.Herein,a hybrid ZnO@Au nanorod array with fast bacterial inactivation and excellent recyclability was reported.93%bacteria could be inactivated within 5 min ultra-sonication under indoor daylight,and the killing rate maintains above 90%after seven repeated using cycles.Antibacterial mechanism involves extracellular reactive oxygen species(ROS)generated from photocatalysis and piezoelectricity of nanorod array,intracellular ROS generation and decrease of adenosine-triphosphate(ATP)originated from electron transfer(ET)from bacteria to nanorod array,as well as mechanical effect from the nanorod,among which ET mechanism plays a major role.Large Schottky barrier from the hybrid interface not only enhances the ROS generation by promoting the charge transfer and carrier separation as well as light utilization,but also enables one-direction electron transfer from bacteria to nanorod array.The resultant continuous electron loss breaks the energy metabolism and disturbs the redox equilibrium,leading to bacterial death.This study demonstrates the great potential of hybrid structure in antibacterial applications and indicates ET as a novel effective antibacterial mechanism for semiconductor materials,which provides insights into the design of next-generation antibacterial materials.
