In this work, we successfully synthesized bicrystalline anatase/TiO2（B） nanofibre and used it as active substrate for surface-enhanced Raman scattering （SERS） applications. The bicrystalline structured TiO2 substr...In this work, we successfully synthesized bicrystalline anatase/TiO2（B） nanofibre and used it as active substrate for surface-enhanced Raman scattering （SERS） applications. The bicrystalline structured TiO2 substrates provide additional charge transfer across the anatase-TiO2（B） interface and thus enhanced activity compared to the pure single crystalline phase. With an effort to further increase the sensitivity of SERS, nitrogen element was doped into bicrystalline anatase/TiO2（B） nanofibres （N-TiO2） and higher SERS enhancement was achieved. The nitrogen content was controlled by tuning the calcination temperature of titanate precursor at 500, 600 and 700℃, respectively. The sample calcined at 600℃ （NT600） acquires the highest percentage of nitrogen element due to its open pore structure that facilitates the diffusion of nitrogen during calcination. Raman intensity depends on the amount of nitrogen doping, thus NT600 exhibited the best SERS activity. The doped nitrogen in TiO2 facilitates the charge transfer between TiO2 and probing molecules and thus suppresses the electron-hole recombination. This work provides a new perspective on the design of efficient TiO2 SERS active substrate and is expected to be valuable for adsorbate detection on semiconductor surface.展开更多
In the last years, Europe has aimed at the creation of a new European public sphere that has grown beside and has not replaced the national ones; a public sphere in which the idea of Europe as a shared value, as a rea...In the last years, Europe has aimed at the creation of a new European public sphere that has grown beside and has not replaced the national ones; a public sphere in which the idea of Europe as a shared value, as a reality of nations, but also as a reality of regions and cities, can build and develop. This aim is the result of a long discussion that has led to consider the public communication as a fundamental instrument supporting the dialogue between institutions and citizens and the result of an important sociological debate. Communication is nowadays considered as a structural element of Union＇s programs, and the transformation of the media system, the possibilities of communication offered by the social media, and the growth of participatory cultures have opened new ways to the development of European public communication that can contribute to increasing the European public sphere. This process involves an awareness from institutions and their representatives on the use of social media （e.g., Facebook, Twitter, etc.） to improve the relationship with the citizens and to create a sense of belonging to Europe.展开更多
基金Supported by Chinese MOST 973 project(2013CB733501)the National Natural Science Foundation of China1(21136004,21476106,21606131)+1 种基金the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)the Fundamental Research Funds for the Central Universities(30916011351)at Nanjing University of Science&Technology
文摘In this work, we successfully synthesized bicrystalline anatase/TiO2（B） nanofibre and used it as active substrate for surface-enhanced Raman scattering （SERS） applications. The bicrystalline structured TiO2 substrates provide additional charge transfer across the anatase-TiO2（B） interface and thus enhanced activity compared to the pure single crystalline phase. With an effort to further increase the sensitivity of SERS, nitrogen element was doped into bicrystalline anatase/TiO2（B） nanofibres （N-TiO2） and higher SERS enhancement was achieved. The nitrogen content was controlled by tuning the calcination temperature of titanate precursor at 500, 600 and 700℃, respectively. The sample calcined at 600℃ （NT600） acquires the highest percentage of nitrogen element due to its open pore structure that facilitates the diffusion of nitrogen during calcination. Raman intensity depends on the amount of nitrogen doping, thus NT600 exhibited the best SERS activity. The doped nitrogen in TiO2 facilitates the charge transfer between TiO2 and probing molecules and thus suppresses the electron-hole recombination. This work provides a new perspective on the design of efficient TiO2 SERS active substrate and is expected to be valuable for adsorbate detection on semiconductor surface.
文摘In the last years, Europe has aimed at the creation of a new European public sphere that has grown beside and has not replaced the national ones; a public sphere in which the idea of Europe as a shared value, as a reality of nations, but also as a reality of regions and cities, can build and develop. This aim is the result of a long discussion that has led to consider the public communication as a fundamental instrument supporting the dialogue between institutions and citizens and the result of an important sociological debate. Communication is nowadays considered as a structural element of Union＇s programs, and the transformation of the media system, the possibilities of communication offered by the social media, and the growth of participatory cultures have opened new ways to the development of European public communication that can contribute to increasing the European public sphere. This process involves an awareness from institutions and their representatives on the use of social media （e.g., Facebook, Twitter, etc.） to improve the relationship with the citizens and to create a sense of belonging to Europe.
