We investigated the structural, electronic, and photocatalytic properties of the Janus monolayers (MLs) composed of the metal chalcogenides Ga2XY and In2XY (X = S, Se, Te; Y = S, Se, Te). The calculated phonon dispersion curves show that all Janus materials are mechanically stable, presenting the same structures as their pristine counterparts. Janus MLs are characterized by the presence of different chalcogen atoms lying on the opposite sides, giving rise to an electric dipole embedded perpendicularly to the ML, and thus the electronic band alignment becomes side-dependent, a property that can be exploited for different technological applications. Except for Ga2SSe, the other Janus crystals exhibit direct band gaps. On the basis of the GW Bethe–Salpeter approach, we found lower exciton binding energies (0.3–0.7 eV) in comparison with the pristine systems. Once the Janus MLs combine small values of the exciton binding energies and electron–hole separation, our results reveal that they fulfill all of the required conditions to be used in the hydrogen generation by photocatalytic water splitting.
Este trabalho teve como objetivo avaliar a composi��o qu�mica corporal e do fil� da til�pia do Nilo adulta, alimentadas com ra��es com cinco n�veis de prote�na digest�vel (PD): 14, 19, 24, 29 e 34% e quatro de energia digest�vel (ED): 2.600, 2.800, 3.000 e 3.200 Kcal/ kg-1. Foram distribu�das 60 til�pias do Nilo, revertidas sexualmente, em 20 unidades experimentais de polietileno com 1.000 L de volume �til cada. Os animais foram alimentados �s 8h, 13h e 18h de cada dia, a temperatura e o oxig�nio avaliados diariamente e as demais vari�veis semanalmente. Ao final de 60 dias de experimento os peixes foram abatidos e avaliados a composi��o qu�mica (umidade, cinzas, prote�na e gordura bruta) corporal e do fil� dos peixes. Os resultados m�dios das an�lises bromatol�gicas do fil� de til�pia do Nilo foram: umidade 75,14%, cinzas 1,19%, prote�na bruta 24,80% e gordura bruta 0,78%. Quanto aos resultados m�dios obtidos da an�lise corporal da til�pia do Nilo, umidade 68,74 %, cinzas 3,96%, prote�na bruta 17,71% e gordura bruta 5,54%. Os dados foram analisados estatisticamente por two way ANOVA (p<0,05) e foi verificado um efeito significativo do n�vel de energia digest�vel sobre a prote�na do fil�, onde o menor n�vel energ�tico promoveu fil�s com menor prote�na que os demais n�veis, os quais foram significativamente semelhantes entre si. Ra��es com baixo n�vel de energia digest�vel independentemente do n�vel de prote�na digest�vel proporcionam fil�s com menor concentra��o de prote�na em til�pias do Nilo adultas.
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