Synthesis and characterization of undoped and copper-doped zinc oxide nanowires for optoelectronic and solar cells applications

Hadia, N. M. A.; Aljudai, Mathir; Alzaid, Meshal; Mohamed, S. H.; Mohamed, W. S.

doi:10.1007/s00339-021-05155-8

Cited by 17 publications

(4 citation statements)

References 54 publications

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“…然而, 仅采用纯 ZnO 材料制备传感器件在检测 NO 2 气体时存在响应/恢复时间较长、气体选择性差、操作条件较苛刻等问题. 为提高性能, 科学工作者尝试了金属掺杂、材料复合、调控形貌等策略 [12][13][14][15][16][17][18] . 如, 在 Cu 掺杂 ZnO 材料传感 NO 2 研究方面, Patil 等 [19] 采用湿化学方法合成了纳米棒传感材料; Cu 掺杂浓度改变六边形 ZnO 晶体结构和材料表面形貌, 其器件可实现低温(120～220 ℃)下对 NO 2 气敏性能快速响应和高选择性检测.…”

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“…尤其是引入金属杂原子和材料复合的情况下, 材料的结构表征则更加困难. 因此, 在本工作中, [12][13][14][19][20][21][22][23][24][25][26][28][29] . ZOC 中包括两类相邻 Cu• , 而 Cu 的氧化态则介于一价和二价之间, 与实验的 X 射线光电子能谱 (XPS)表征相一致 [24] .…”

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“…比较 [28,[36][37] . 在表 S7(见支持信息)中, 总结了实验得到的 ZnO、 ZOC 和 ZOC 复合材料对 NO 2 传感的响应和恢复时间 [13,28,[34][35][36][37]44] [12][13][14]19,[45][46] .…”

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Density Functional Theory Study of Structures of Copper-doped and Graphitic Carbon Nitride-combined Zinc Oxides and Their Boosted Nitrogen Dioxide-sensing Performance

Wang,

Xiao,

Xie

et al. 2023

Acta Chimica Sinica

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Of numerous environmental problems, the air pollution caused by toxic nitrogen dioxide has become more and more serious. Its timing detection is of utmost importance but challenging. It is known that NO2 sensors fabricated by zinc oxide-derived materials suffer some issues. And thus synthetic strategies such as doping and combining have been developed to improve sensitive performance and modify operation condition. However, the relevant sensing reaction mechanism still remains unclear; moreover, the experimentally structural characterizations on sensitive materials (SMs) and reaction intermediates are rather difficult at the atomic level, which turn much worse for the doped and combined SMs. In the work, density functional theory calculations have been exploited to examine copper-doped zinc oxide (marked as ZOC) and its composites ZOC/CN and ZOC/Gr. CN and Gr are short for 2D materials, graphitic carbon nitride (g-C3N4) and graphene, respectively. The local structures have been accessible for these SMs and their intermediates along the reaction pathway. It is shown that ZOC bears the Cu-Zn heterobimetallic adsorption active sites, which hold NO2 via Cu/Zn-O dative bonds. The introduction of copper increases metal contribution to high-lying occupied molecular orbitals (MOs). Major NO2→ZOC donation and minor back-donation interactions have been recognized by charge decomposition analyses in terms of fragment MOs. Consequently, its adsorption free energy towards NO2 is strengthened by 0.27 eV relative to pristine ZnO. These well interpret the experimental findings that the copper-doped zinc oxide has much faster response time. Further combination with g-C3N4 enhances the NO2-sensing performance, which turns out to be the best SM candidate. Exemplarily, ZOC/CN shows the most negative NO2 adsorption energy (-0.31 eV), very small uphill energy for the rate-determining step (0.27 eV) and modest formation energy of nitrate (-1.06 eV). With these, the SM not only responses NO2 rapidly but also desorbs nitrate at mild

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Density Functional Theory Study of Structures of Copper-doped and Graphitic Carbon Nitride-combined Zinc Oxides and Their Boosted Nitrogen Dioxide-sensing Performance

Wang,

Xiao,

Xie

et al. 2023

Acta Chimica Sinica

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“…Our research seeks to bridge this gap by extending into controlled sol–gel methods and employing SPS to maintain a consistent temperature. By comprehensively investigating copper-doped ZnO materials, we aim to shed light on the synthesis intricacies and their impact on the electronic performance, providing essential contributions to the evolving landscape of electronic device applications [ 15 , 16 ]. Our approach involves proposing a method to simultaneously achieve low thermal conductivity and a high thermoelectric power factor using controlled dopant concentration and coherent homoepitaxial interfaces.…”

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Study of Electrical and Dielectric Behaviors of Copper-Doped Zinc Oxide Ceramic Prepared by Spark Plasma Sintering for Electronic Device Applications

Benamara,

Iben Nassar,

Rivero-Antúnez

et al. 2024

Nanomaterials

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In this study, Cu-doped ZnO aerogel nanoparticles with a 4% copper concentration (Cu4ZO) were synthesized using a sol–gel method, followed by supercritical drying and heat treatment. The subsequent fabrication of Cu4ZO ceramics through Spark Plasma Sintering (SPS) was characterized by X-ray diffraction (XRD), field-emission gun scanning electron microscopy (FE-SEM) equipped with EDS, and impedance spectroscopy (IS) across a frequency range of 100 Hz to 1 MHz and temperatures from 270 K to 370 K. The SPS–Cu4ZO sample exhibited a hexagonal wurtzite structure with an average crystallite size of approximately 229 ± 10 nm, showcasing a compact structure with discernible pores. The EDS spectrum indicates the presence of the base elements zinc and oxygen with copper like the dopant element. Remarkably, the material displayed distinct electrical properties, featuring high activation energy values of about 0.269 ± 0.021 eV. Complex impedance spectroscopy revealed the impact of temperature on electrical relaxation phenomena, with the Nyquist plot indicating semicircular arc patterns associated with grain boundaries. As temperature increased, a noticeable reduction in the radius of these arcs occurred, coupled with a shift in their center points toward the axis center, suggesting a non-Debye-type relaxation mechanism. Dielectric analyses revealed a temperature-driven evolution of losses, emphasizing the material’s conductivity impact. Non-Debye-type behavior, linked to ion diffusion, sheds light on charge storage dynamics. These insights advance potential applications in electronic devices and energy storage.

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Impact of silver/copper dual-doping on the structure, linear and non-linear optical performance of ZnO thin films

et al. 2022

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Synthesis and characterization of undoped and copper-doped zinc oxide nanowires for optoelectronic and solar cells applications

Cited by 17 publications

References 54 publications

Density Functional Theory Study of Structures of Copper-doped and Graphitic Carbon Nitride-combined Zinc Oxides and Their Boosted Nitrogen Dioxide-sensing Performance

Density Functional Theory Study of Structures of Copper-doped and Graphitic Carbon Nitride-combined Zinc Oxides and Their Boosted Nitrogen Dioxide-sensing Performance

Study of Electrical and Dielectric Behaviors of Copper-Doped Zinc Oxide Ceramic Prepared by Spark Plasma Sintering for Electronic Device Applications

Impact of silver/copper dual-doping on the structure, linear and non-linear optical performance of ZnO thin films

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