Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have be...Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have been recorded in the wavelength range 200-800 nm. Optical constants （absorption coefficient, optical band gap, refractive index and extinction coefficient） of as prepared and after CO2 laser irradiated films have been studied as a function of photon energy. It has been found that the optical parameters of the films were changed significantly after laser treatments. Results show that the energy gaps and the absorption edges shifted to lower energies with the increase in dopant concentration and laser irradiation. The results are interpreted in terms of the change in concentration of localized states.展开更多
Developing high-performance anode materials for potassium-ion batteries is significantly urgent. We here demonstrate Sb_2S_3 nanoparticles(~20 nm) homogeneously dispersed in porous S,N-codoped graphene framework(Sb_2S...Developing high-performance anode materials for potassium-ion batteries is significantly urgent. We here demonstrate Sb_2S_3 nanoparticles(~20 nm) homogeneously dispersed in porous S,N-codoped graphene framework(Sb_2S_3-SNG) as a self-supported anode material for potassium-ion batteries. The rational structure design of integrating Sb_2S_3 nanoparticles with S,N-codoped graphene contributes to high reactivity, strong affinity, good electric conductivity, and robust stability of the composite, enabling superior K-storage performance. Moreover, the self-supported architecture significantly decreases the inactive weight of the battery, resulting in a high energy density of a Sb_2S_3-SNG/KVPO_4 F-C full cell to ~166.3 W h kg^(-1).展开更多
文摘Transparent films ofPoly （methylmethacrylate） doped with different concentrations （0, 3 and 4）wt% of Sb203 nanoparticles were prepared using solution cast technique. The transmission and absorption spectra have been recorded in the wavelength range 200-800 nm. Optical constants （absorption coefficient, optical band gap, refractive index and extinction coefficient） of as prepared and after CO2 laser irradiated films have been studied as a function of photon energy. It has been found that the optical parameters of the films were changed significantly after laser treatments. Results show that the energy gaps and the absorption edges shifted to lower energies with the increase in dopant concentration and laser irradiation. The results are interpreted in terms of the change in concentration of localized states.
基金supported by the National Natural Science Foundation of China (21231005, 51231003)the Program of Introducing Talents of Discipline to Universities of China (B12015)
文摘Developing high-performance anode materials for potassium-ion batteries is significantly urgent. We here demonstrate Sb_2S_3 nanoparticles(~20 nm) homogeneously dispersed in porous S,N-codoped graphene framework(Sb_2S_3-SNG) as a self-supported anode material for potassium-ion batteries. The rational structure design of integrating Sb_2S_3 nanoparticles with S,N-codoped graphene contributes to high reactivity, strong affinity, good electric conductivity, and robust stability of the composite, enabling superior K-storage performance. Moreover, the self-supported architecture significantly decreases the inactive weight of the battery, resulting in a high energy density of a Sb_2S_3-SNG/KVPO_4 F-C full cell to ~166.3 W h kg^(-1).
