A high yield of silver nanotubes with large aspect ratio were conveniently synthesized via an organic-assist solvothermal preparation technique using polyvinyl pyrrolidone （PVP） as a capping reagent and architecture...A high yield of silver nanotubes with large aspect ratio were conveniently synthesized via an organic-assist solvothermal preparation technique using polyvinyl pyrrolidone （PVP） as a capping reagent and architecture soft-template. The molecular ratio between the repeating unit of PVP and AgNO3 plays a crucial role in determining the geometric shape of the product. Such novel-type Ag nanotubes were self-assembled by Ag nanoparticles, which had largely similar crystallographic orientation, forming a texture. The fact that nanoparticles without anisotropic crystal structures can form such superstructures by self-assembly may open a window for understanding a range of nanotube formation processes.展开更多
Bulk samples of quasi-binary compounds in the Sn(Pb)Te-Bi2Te3 system were prepared by solvothermal method followed by a sintering procedure of compacted pellets. The formation mechanism of the precursor powders, micro...Bulk samples of quasi-binary compounds in the Sn(Pb)Te-Bi2Te3 system were prepared by solvothermal method followed by a sintering procedure of compacted pellets. The formation mechanism of the precursor powders, microstructure and thermoelectric properties of the final bulk samples were studied.展开更多
Visible and near-infrared(NIR)light dual-band photodetectors(PDs)have potential applications in signal detection,bioimaging,optical communications and safety monitoring.Herein,we report an ultrafast perovskite/organic...Visible and near-infrared(NIR)light dual-band photodetectors(PDs)have potential applications in signal detection,bioimaging,optical communications and safety monitoring.Herein,we report an ultrafast perovskite/organic heterojunction dual-mode PD with a voltage-modulated photoresponse range in visible and NIR spectra.The PD,comprising a perovskite layer to absorb visible light(500–810 nm)and an organic bulk heterojunction layer for NIR light absorption(810–950 nm),exhibited a switchable spectral response in the visible or NIR bands.The voltage-modulated visible and NIR photoresponses of the PD were attributable to controlled charge photogeneration in perovskite and organic blend thin films under different bias polarities.The device exhibited peak responsivities of 93.5 and 102.2 mA/W in the visible and NIR bands,respectively;a high detectivity of 4.3×10^(9) Jones(at forward bias of 0.7 V and incident 625 nm light)and 1.6×10^(12) Jones(at reverse bias of–1.5 V and incident 900 nm light);a fast microsecond response time;and a wide dynamic range(>120 dB)both in the visible mode and NIR mode.Also,this voltage-modulated dual-band PD shows promising applications in visible light and NIR imaging,which is proven by demonstrating a PD array with 25 pixels(5×5).展开更多
基金Supported by the National Natural Science Foundation of China (No. 50232030)
文摘A high yield of silver nanotubes with large aspect ratio were conveniently synthesized via an organic-assist solvothermal preparation technique using polyvinyl pyrrolidone （PVP） as a capping reagent and architecture soft-template. The molecular ratio between the repeating unit of PVP and AgNO3 plays a crucial role in determining the geometric shape of the product. Such novel-type Ag nanotubes were self-assembled by Ag nanoparticles, which had largely similar crystallographic orientation, forming a texture. The fact that nanoparticles without anisotropic crystal structures can form such superstructures by self-assembly may open a window for understanding a range of nanotube formation processes.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.50072010 and 59825102).
文摘Bulk samples of quasi-binary compounds in the Sn(Pb)Te-Bi2Te3 system were prepared by solvothermal method followed by a sintering procedure of compacted pellets. The formation mechanism of the precursor powders, microstructure and thermoelectric properties of the final bulk samples were studied.
基金supported by the National Natural Science Foundation of China(52027817 and 03012800001)Shenzhen Science and Technology Innovation Committee(JCYJ20200109144614514)+1 种基金the support from the Hong Kong Research Grant Council for the GRF grant(11314122)the Guangdong Major Project of Basic and Applied Basic Research(2019B030302007)。
文摘Visible and near-infrared(NIR)light dual-band photodetectors(PDs)have potential applications in signal detection,bioimaging,optical communications and safety monitoring.Herein,we report an ultrafast perovskite/organic heterojunction dual-mode PD with a voltage-modulated photoresponse range in visible and NIR spectra.The PD,comprising a perovskite layer to absorb visible light(500–810 nm)and an organic bulk heterojunction layer for NIR light absorption(810–950 nm),exhibited a switchable spectral response in the visible or NIR bands.The voltage-modulated visible and NIR photoresponses of the PD were attributable to controlled charge photogeneration in perovskite and organic blend thin films under different bias polarities.The device exhibited peak responsivities of 93.5 and 102.2 mA/W in the visible and NIR bands,respectively;a high detectivity of 4.3×10^(9) Jones(at forward bias of 0.7 V and incident 625 nm light)and 1.6×10^(12) Jones(at reverse bias of–1.5 V and incident 900 nm light);a fast microsecond response time;and a wide dynamic range(>120 dB)both in the visible mode and NIR mode.Also,this voltage-modulated dual-band PD shows promising applications in visible light and NIR imaging,which is proven by demonstrating a PD array with 25 pixels(5×5).
