نتایج جستجو برای: visible light

تعداد نتایج: 452694  

Journal: :Chemical communications 2012
Guohui Dong Kun Zhao Lizhi Zhang

We theoretically and experimentally demonstrate that carbon self-doping could induce intrinsic electronic and band structure change of g-C(3)N(4)via the formation of delocalized big π bonds to increase visible light absorption and electrical conductivity as well as surface area and thus enhance both photooxidation and photoreduction activities.

2016
Kalpesh Sorathiya Biswajit Mishra Abhishek Kalarikkal Kasala Prabhakar Reddy Chinnakonda S. Gopinath Deepa Khushalani

Recyclability is an important aspect for heterogeneous photo-catalysts. Ease of recovery and stability of the photo-catalyst in terms of efficiency over the number of cycles are highly desired and in fact it is ideal if the efficiency is constant and it should not decrease marginally with each cycle. Presented here is a seminal observation in which the photocatalytic activity is shown to improv...

Journal: :ACS applied materials & interfaces 2016
Patrizia Richner Hadi Eghlidi Stephan J P Kress Martin Schmid David J Norris Dimos Poulikakos

The fabrication of functional metamaterials with extreme feature resolution finds a host of applications such as the broad area of surface/light interaction. Nonplanar features of such structures can significantly enhance their performance and tunability, but their facile generation remains a challenge. Here, we show that carefully designed out-of-plane nanopillars made of metal-dielectric comp...

Journal: :Chemical communications 2011
Johannes Forster Benedikt Rösner Marat M Khusniyarov Carsten Streb

A new mechanism for enhancing the visible light absorption of a homogeneous polyoxovanadate system is described. The photoactive pentanuclear {V(5)} isopolyoxovanadate cluster is formed in situ by a thermally-induced condensation reaction starting from a tetranuclear {V(4)} precursor. Upon irradiation with visible light, {V(5)} undergoes a light induced reduction reaction resulting in the forma...

Journal: :Nanoscale 2014
Yinghong Gu Fei Qin Joel K W Yang Swee Ping Yeo Cheng-Wei Qiu

Dark plasmon resonance modes are optical modes that have small scattering cross-sections and are thus difficult to excite directly by light at normal incidence. In this paper, we propose to excite quadrupolar and higher-order modes with normal incident light (in the visible regime) on a continuous plasmonic metallic surface covering a dielectric pillar array, hence resulting in narrow-band perf...

Journal: :Chemical communications 2017
Hongyu Wang Yanfei Ren Kaiye Wang Yunquan Man Yanan Xiang Na Li Bo Tang

A novel method for concisely synthesizing 1,2,4-triazolines via [3+2] cyclization under visible light is reported. These compounds can be easily converted into 1,2,4-triazoles under basic or photoredox conditions. The application of the 1,2,4-triazoles was also investigated via mild operations.

Journal: :Applied microbiology 1972
D A LeBuis J R Lorenz W J Eisler R B Webb

A vapor arc light source has been adapted to the study of the lethal action on bacteria of near-ultraviolet (UV) and visible light. Its use makes possible much shorter exposure times than could be obtained from previously available sources. The output of radiant energy is sufficient to provide a fairly detailed action spectrum for lethality in the long-UV and visible region without the addition...

Journal: :Advanced materials 2015
Zhong Zheng Shaoqing Zhang Maojie Zhang Kang Zhao Long Ye Yu Chen Bei Yang Jianhui Hou

Highly efficient polymer solar cells with a tandem structure are fabricated by using two excellent photovoltaic polymers and a highly transparent intermediate recombination layer. Power conversion -efficiencies over 10% can be realized with a photovoltaic response within 800 nm.

Journal: :Chemical communications 2013
Maxim A Nasalevich Maarten G Goesten Tom J Savenije Freek Kapteijn Jorge Gascon

Correction for 'Enhancing optical absorption of metal-organic frameworks for improved visible light photocatalysis' by Maxim A. Nasalevich et al., Chem. Commun., 2013, 49, 10575-10577.

Journal: :Chemical communications 2014
Po Wu Jiarui Wang Jing Zhao Liejin Guo Frank E Osterloh

A high rate of 2.23 mmol h(-1) g(-1) (quantum efficiency of 6.67% at 400 nm) for visible light driven photocatalytic H2 evolution can be achieved with g-C3N4 by alkalization of the solution to a pH of 13.3, due to accelerated transfer of photoholes to the sacrificial donor.

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