期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Engineering the Thermoelectrical Properties of PEDOT:PSS by Alkali Metal Ion Effect 被引量:1
1
作者 Jingjin Dong Jian Liu +3 位作者 Xinkai Qiu Ryan Chiechi L.Jan Anton Koster giuseppe portale 《Engineering》 SCIE EI 2021年第5期647-654,共8页
Engineering the electrical properties of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)holds great potential for various applications such as sensors,thermoelectric(TE)generators,and hole transport... Engineering the electrical properties of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)holds great potential for various applications such as sensors,thermoelectric(TE)generators,and hole transport layers in solar cells.Various strategies have been applied to achieve optimal electrical properties,including base solution post-treatments.However,the working mechanism and the exact details of the structural transformations induced by base post-treatments are still unclear.In this work,we present a comparative study on the post-treatment effects of using three common and green alkali base solutions:namely LiOH,NaOH,and KOH.The structural modifications induced in the film by the base post-treatments are studied by techniques including atomic force microscopy,grazing-incidence wide-angle X-ray scattering,ultraviolet–visible–near-infrared spectroscopy,and attenuated total reflectance Fourier-transform infrared spectroscopy.Base-induced structural modifications are responsible for an improvement in the TE power factor of the films,which depends on the basic solution used.The results are explained on the basis of the different affinity between the alkali cations and the PSS chains,which determines PEDOT dedoping.The results presented here shed light on the structural reorganization occurring in PEDOT:PSS when exposed to high-pH solutions and may serve as inspiration to create future pH-/ion-responsive devices for various applications. 展开更多
关键词 PEDOT:PSS Thermoelectric properties Alkali base solutions POST-TREATMENT Structure-property relationship Grazing-incidence wide-angle X-ray SCATTERING
下载PDF
Lattice reconstruction for mixed-halide blue perovskite light-emitting diodes with high brightness,outstanding color stability and low efficiency roll-off
2
作者 Jionghua Wu Renjie Wang +4 位作者 Rui Zhang giuseppe portale Eduardo Solano Xiaoke Liu Feng Gao 《Science China Materials》 SCIE EI CAS CSCD 2024年第11期3553-3560,共8页
We report a simple,effective,and universal lattice reconstruction approach to improve the quality of perovskite films by using nonpolar solvents with high Gutmann donor numbers(DNs).We find that high-DN nonpolar solve... We report a simple,effective,and universal lattice reconstruction approach to improve the quality of perovskite films by using nonpolar solvents with high Gutmann donor numbers(DNs).We find that high-DN nonpolar solvents,for instance,ethyl acetate,can interact with perovskite precursors.Such a solvent can make the perovskite lattice more ordered and“harder”and promote the formation of heterostructures with low-dimensional perovskite impurities and residual solvent molecules.As a result,the latticereconstructed perovskite films exhibit reduced defect densities and suppressed ion migration.The resultant mixed-halide blue perovskite light-emitting diodes(PeLEDs)show greatly enhanced tolerance to high driving current densities and voltages,demonstrating high brightness,outstanding color stability and low efficiency roll-off.Our work provides a deep understanding of the interactions between nonpolar solvents and perovskites and offers useful guidelines for further development of high-power PeLEDs. 展开更多
关键词 color stability mixed halide perovskite low efficiency roll-off high brightness ion migration
原文传递
In situ observation of synthesized nanoparticles in ultra-dilute aerosols via X-ray scattering
3
作者 Sarah R.McKibbin Sofie Yngman +10 位作者 Olivier Balmes Bengt O.Meuller Simon Tagerud Maria E.Messing giuseppe portale Michael Sztucki Knut Deppert Lars Samuelson Martin H.Magnusson Edvin Lundgren Anders Mikkelsen 《Nano Research》 SCIE EI CAS CSCD 2019年第1期25-31,共7页
In-air epitaxy of nanostructures(Aerotaxy)has recently emerged as a viable route for fast,large-scale production.In this study,we use small-a ngle X-ray scatteri ng to perform direct in-flight characterizati ons of th... In-air epitaxy of nanostructures(Aerotaxy)has recently emerged as a viable route for fast,large-scale production.In this study,we use small-a ngle X-ray scatteri ng to perform direct in-flight characterizati ons of the first step of this process,i.e.,the en gineered formatio n of Au and Pt aerosol nan oparticles by spark gen erati on in a flow of N2 gas.This represe nts a particular challe nge for characterizati on because the particle density can be extremely low in con trolled production.The particles produced are exami ned duri ng producti on at operatio nal pressures close to atmospheric conditions and exhibit a log no rmal size distributi on ranging from 5-100nm.The Au and Pt particle productio n and detection are compared.We observe and characterize the nanoparticles at different stages of synthesis and extract the corresponding domi nant physical properties,in cludi ng the average particle diameter and sphericity,as in flue need by particle sintering and the prese nee of aggregates.We observe highly sorted and sin tered spherical Au nano particles at ultra-dilute concen tratio ns(<5×10^5 particles/cm^3)corresponding to a volume fraction below 3×10^-10,which is orders of magnitude below that of previously measured aerosols.We independently confirm an average particle radius of 25 nm via Guinier and Kratky plot analysis.Our study indicates that with high-intensity synchrotron beams and careful con sideratio n of backgro und removal,size and shape info rmati on can be obtai ned for extremely low particle concentrations with industrially relevant narrow size distributions. 展开更多
关键词 AEROSOL nanoparticle synthesis in SITU analysis SMALL-ANGLE X-ray scattering Aerotaxy
原文传递
Novel engineered proteins for mechanomaterials
4
作者 giuseppe portale 《Frontiers of Chemical Science and Engineering》 SCIE EI CAS CSCD 2020年第6期1122-1123,共2页
In stark contrast to traditional polymer fibers such as nylon and Kevlar,biomaterials[1],e.g.,spider silks and silkworms,exhibit extraordinary mechanical behaviors due to the combination of high strength and high toug... In stark contrast to traditional polymer fibers such as nylon and Kevlar,biomaterials[1],e.g.,spider silks and silkworms,exhibit extraordinary mechanical behaviors due to the combination of high strength and high toughness. 展开更多
关键词 NYLON fibers TOUGHNESS
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部