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How does the Zn-precursor nature impact carrier transfer in ZnO/Zn-TiO2 nanostructures? organic vs. inorganic anions†

JoelmaR. De Melo,*a Andrés F.Gualdrón-Reyes, *bc Nádia R.Camargo Fernandes, a Marcelino L.Gimenes,a María I.Carreño-Lizcano,bc Ingrid N.Sequeda-Pico,bc JhonatanRodríguez-Pereira,bd VictorBaldovino-Medrano bdand Martha E.Niño-Gómez *bc

* Corresponding authors

a Universidade Estadual de Maringá, Departamento de Engenharia Química, Avenida Colombo 5790, Maringá 87020-900, Paraná, Brazil E-mail: rmjoelma

b Centro de Investigaciones en Catálisis (CICAT), Universidad Industrial de Santander, Sede UIS Guatiguará, Piedecuesta, Santander, Colombia E-mail: marthan

Xem thêm: Thế Nào Là Hợp Chất Là Gì? Đơn Chất Là Gì, Hợp Chất Là Gì, Đặc Điểm Cấu Tạo


c Centro de Investigación Científica y Tecnológica en Materiales y Nanociencias (CMN), Universidad Industrial de Santander, Piedecuesta, Santander, Colombia

d Laboratorio de Ciencia de superficies (Surf-Lab), Universidad Industrial de Santander, km 2 vía El Refugio, Piedecuesta, Santander, Colombia

The formation of heterostructures is one of the most recognized alternatives to improve visible-light absorption and carrier mobility in metal oxide-based composite photoanodes. Despite this fact, how the precursor nature influences photoanode preparation with respect to the abovementioned performance behavior has not been deeply elucidated. Aiming to lớn clarify the role of the synthesis precursors in the crystal growth during the formation of metal oxide-based heterostructures, we studied the morphology and photoelectrochemical (PEC) performance of ZnO nanorod/TiO2 nanoparticle based thin films obtained by the sol–gel method. By using zinc nitrate (N) and zinc acetate (A) as precursors for ZnO nanorod preparation, ZnO-N/TiO2 (N-ZT) and ZnO-A/TiO2 (A-ZT) based n–n type heterojunctions were established, where the growth of the ZnO nanorods depended on the used precursor anion. By using the inorganic precursor, large ZnO nanorods were formed containing a high Zn+ electron donor density. This allowed the carrier flow into the N-ZT film, also supported by a high mật độ trùng lặp từ khóa of Ti3+ species. Conversely, small ZnO nanorods were produced with the use of organic precursor, as a result of Zn2+ dissolution during ZnO formation. This induced the decrease of Zn+ and Ti3+ nội dung in the A-ZT film. Additionally, Zn2+ thermally diffused from ZnO to lớn TiO2, promoting the Zn2+-doping of TiO2 and increasing the amount of interfacial and acceptor energy levels in both the N-ZT and A-ZT films. Nonetheless, the donor energy level content was higher in the former material, which facilitated charge carrier separation and transport. Therefore, an improved electron lifetime & a lowered recombination rate were achieved.