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Nanoporous CuO/CeO2 ribbons are
successfully prepared through dealloying melt-spun Al80-xCu20Cex (x = 0.5, 1, 2,
3, at%) alloy in a 5 wt% NaOH aqueous solution, followed by calcining in air. The
samples are characterized by XRD, SEM, EDS, HRTEM, Raman and gas chromatograph.
For the dealloyed melt-spun Al80-xCu20Cex (x = 0.5, 1, 2, 3, at%) alloy, the XRD
results indicate that Cu and Cu2O are formed, while CuO and CeO2 are formed coupled
with calcinations. The SEM shows that the CuO/CeO2 ribbons with a homogeneous pore/grain
structure are thermally stable up to 600℃because uniform CeO2 particles are dispersedly
loaded on the fine CuO grains of the porous structure, which is validated by TEM
again. Meanwhile, the Raman spectra show that the concentration of oxygen vacancies
reach a maximum value when the calcining temperature at 600℃. In addition, the
gas chromatograph results show that the dealloyed Al78Cu20Ce2 ribbons with calcined
at 600℃have the best active catalysis for CO oxidation and the rates of CO conversation
reaching at 50% and 100% are 150℃and 320℃, respectively, owing to the synergetic
effects of the CuO and CeO2 species.
This paper studies the effect of government
research and development (R&D) subsidies and political relations on the innovative
activities of technological small and medium-sized enterprises (SMEs).
Moreover, the technology innovation path of SMEs is an important issue related
to government R&D subsidies. This paper explores these effects using multiple
case studies. Through case analyses of four biological pharmaceutical
enterprises, we found that first, technological SMEs that receive a significant amount of government
R&D subsidies will transform from exploitative innovation to explorative
innovation in a short amount of time, whereas technological SMEs that receive less
government R&D subsidies will perform less innovative activities over a
long time. Second, technological SMEs with strong political relations tend to
do more explorative innovation, whereas technological SMEs with weak political
relations tend to do more exploitative innovation. Third, technological SMEs with
strong political relations will promote the positive effect of government
R&D subsidies on their innovation performance.