Template-directed synthesis of pyrite (FeS2) nanorod arrays with an enhanced photoresponse

2014 ◽  
Vol 2 (25) ◽  
pp. 9496-9505 ◽  
Author(s):  
Mudan Wang ◽  
Chengcheng Xing ◽  
Ke Cao ◽  
Lei Zhang ◽  
Jiabin Liu ◽  
...  
Keyword(s):  
Specific Area ◽  
Nanorod Array ◽  
Nanotube Arrays ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Photovoltaic Properties ◽  
Transport Pathways ◽  
Directed Synthesis ◽  
Array Structure ◽  
High Specific Area

Well-aligned ZnO nanorod arrays were used as templates to produce Fe(OH)3nanotube arrays. The as-grown Fe(OH)3nanotube arrays were then used as templates to obtain an FeS2nanorod array. The FeS2nanorod arrays had much better photovoltaic properties than the FeS2nanoparticles due to the high specific area, direct transport pathways and enhanced light harvesting of the nanorod array structure.

Facile Synthesis of a Porous ZnO Nanorod Array with Enhanced Photocatalysis for Photoelectrochemical Water Splitting Application

2020 ◽  
Vol 20 (6) ◽  
pp. 3512-3518
Author(s):  
Saleh Khan ◽  
Xiao-He Liu ◽  
Xi Jiang ◽  
Qing-Yun Chen
Keyword(s):  
Annealing Temperature ◽  
Zno Nanorods ◽  
Nanorod Array ◽  
Photocurrent Density ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Irradiation Intensity ◽  
Heat Treated ◽  
Positive Effect

Highly efficient and effective porous ZnO nanorod arrays were fabricated by annealing ZnO nanorod arrays grown on a substrate using a simple hydrothermal method. The annealing had a positive effect on the nanorod morphology, structure and optical properties. The porosity was closely related to the annealing temperature. After heating at 450 °C, pores appeared on the nanorods. It was demonstrated that the porosity could be exploited to improve the visible light absorption of ZnO and reduce the bandgap from 3.11 eV to 2.99 eV. A combination of improved charge separation and transport of the heat-treated ZnO thus led to an increase in the photoelectrochemical properties. At an irradiation intensity of 100 mW/cm−2, the photocurrent density of the porous nanorod array was approximately 1.3 mA cm−2 at 1.2 V versus Ag/AgCl, which was five times higher than that of the ZnO nanorods. These results revealed the synthesis of promising porous ZnO nanorods for photoelectrochemical applications.

Effect of KOH treatment on structural and photovoltaic properties of ZnO nanorod arrays

2012 ◽  
Vol 22 (11) ◽  
pp. 2736-2741 ◽  
Author(s):  
Yi ZHOU ◽  
Dang LI ◽  
Yan HUANG ◽  
Wen-hong HE ◽  
Bin XIAO ◽  
...  
Keyword(s):  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Photovoltaic Properties

scholarly journals Effects of Annealing Environments on the Solution-Grown, Aligned Aluminium-Doped Zinc Oxide Nanorod-Array-Based Ultraviolet Photoconductive Sensor

2012 ◽  
Vol 2012 ◽  
pp. 1-15 ◽  
Author(s):  
Mohamad Hafiz Mamat ◽  
Mohd Izzudin Che Khalin ◽  
Nik Noor Hafizah Nik Mohammad ◽  
Zuraida Khusaimi ◽  
Nor Diyana Md Sin ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Surface Condition ◽  
Zno Nanorods ◽  
Average Diameter ◽  
Nanorod Array ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
High Concentration ◽  
Doped Zno

We have fabricated metal-semiconductor-metal- (MSM-) type ultraviolet (UV) photoconductive sensors using aluminium- (Al-) doped zinc oxide (ZnO) nanorod arrays that were annealed in different environments: air, oxygen, or a vacuum. The Al-doped ZnO nanorods had an average diameter of 60 nm with a thickness of approximately 600 nm that included the seed layer (with thickness~200 nm). Our results show that the vacuum-annealed nanorod-array-based UV photoconductive sensor has the highest photocurrent value of  2.43  ×  10-4 A. The high photocurrent is due to the high concentration of zinc (Zn) interstitials in the vacuum-annealed nanorod arrays. In contrast, the oxygen-annealing process applied to the Al-doped ZnO nanorod arrays produced highly sensitive UV photoconductive sensors, in which the sensitivity reached 55.6, due to the surface properties of the oxygen-annealed nanorods, which have a higher affinity for oxygen adsorption than the other samples and were thereby capable of reducing the sensor’s dark current. In addition, the sensor fabricated using the oxygen-annealed nanorod arrays had the lowest rise and decay time constants. Our result shows that the annealing environment greatly affects the surface condition and properties of the Al-doped ZnO nanorod arrays, which influences the performance of the UV photoconductive sensors.

Photovoltaic Properties of Dye-Sensitized Solar Cells Using Novel Aligned ZnO Nanorod Arrays on Sn-Doped ZnO Seeded Catalyst with Different Aspect Ratio

2015 ◽  
Vol 1109 ◽  
pp. 281-285
Author(s):  
I. Saurdi ◽  
Mohamad Hafiz Mamat ◽  
A.K. Shafura ◽  
M.F. Malik ◽  
A. Ishak ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Dye Sensitized Solar Cells ◽  
Zno Thin Films ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Photovoltaic Properties ◽  
Dye Sensitized ◽  
Doped Zno

The Sn-doped ZnO thin films were deposited on glass and ITO by sol gel Spin Coating technique. The Structural and electrical properties of Sn-doped ZnO thin films were studied and discussed. The Sn-doped ZnO thin film particle sizes were decreased whenever the doping concentration increased. Besides that, the resistivity 7.7 x 102 Ω.cm was obtained at 2 at.% Sn-doped thin films and aligned ZnO nanorod arrays with large surface area were grown on 2 at.% Sn-doped ZnO film. Therefore, dye sensitized solar cell at 2.0 at.% Sn-doped ZnO thin films with aligned ZnO Nanorod arrays have improved in the photocurrent density and conversion efficiency.

Effects of pH on the Growth of ZnO Nanorod Arrays in Aqueous Solution

2011 ◽  
Vol 418-420 ◽  
pp. 1507-1510
Author(s):  
Chun Mei Zhang ◽  
Tao Meng ◽  
Yan Ping Hao ◽  
Qiang Chen
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Zno Nanorods ◽  
Nanorod Array ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Effects Of Ph ◽  
Xrd Patterns

Well-aligned crystalline ZnO nanorod arrays were synthesized on the glass substrate via an aqueous solution route, and the effect of the pH value on structural properties and morphology of ZnO nanorod arrays was investigated using XRD and FESEM. FESEM micrographs show the formation of ZnO nanorod arrays at different pH values. XRD patterns confirm that the ZnO nanorods were wurtzite structure preferentially oriented in c-axis direction and the highest quality of nanorod array was formed at high pH value.

Facile Synthesis of SnO2 Nanotube Arrays by Using ZnO Nanorod Arrays as Sacrificial Templates

2013 ◽  
Vol 29 (11) ◽  
pp. 1053-1058 ◽  
Author(s):  
Yafang Tu ◽  
Qiuming Fu ◽  
Xiaojuan Niu ◽  
Jianping Sang ◽  
Zhijie Tan ◽  
...  
Keyword(s):  
Nanotube Arrays ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Facile Synthesis ◽  
Sno2 Nanotube

scholarly journals Solution Processed Zn1−x−ySmxCuyO Nanorod Arrays for Dye Sensitized Solar Cells

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1710
Author(s):  
Muhammad Saleem ◽  
Ali Algahtani ◽  
Saif Ur Rehman ◽  
Muhammad Sufyan Javed ◽  
Kashif Irshad ◽  
...  
Keyword(s):  
Solar Cells ◽  
Dye Sensitized Solar Cells ◽  
Concentration Field ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Absorption Region ◽  
Photovoltaic Properties ◽  
Dye Sensitized ◽  
Sensitized Solar Cells

Cu- and Sm-doped ZnO nanorod arrays were grown with 1 wt% of Sm and different weight percents (0.0, 0.5, 1.0 and 1.5 wt%) of Cu by two-step hydrothermal method. The influence of Cu concentration and precursor of Sm on the structural, optical and photovoltaic properties of ZnO nanorod arrays was investigated. An X-ray diffraction study showed that the nanorod arrays grown along the (002) plane, i.e., c-axis, had hexagonal wurtzite crystal structure. The lattice strain is present in all samples and shows an increasing trend with Cu/Sm concentration. Field emission scanning electron microscopy was used to investigate the morphology and the nanorod arrays grown vertically on the FTO substrates. The diameter of nanorod arrays ranged from 68 nm to 137 nm and was found highly dependent on Cu concentration and Sm precursor while the density of nanorod arrays almost remains the same. The grown nanorod arrays served as photoelectrodes for fabricating dye-sensitized solar cells (DSSCs). The overall light to electricity conversion efficiency ranged from 1.74% (sample S1, doped with 1 wt% of Sm and 0.0 wt% of Cu) to more than 4.14% (sample S4, doped with 1 wt% of Sm and 1.5 wt% of Cu), which is 60% higher than former sample S1. The increment in DSSCs efficiency is attributed either because of the doping of Sm3+ ions which increase the absorption region of light spectrum by up/down conversion or the doping of Cu ions which decrease the recombination and backward transfer of photo-generated electrons and increase the electron transport mobility. This work indicates that the coupled use of Cu and Sm in ZnO nanorod array films have the potential to enhance the performance of dye-sensitized solar cells.

Preparation and photovoltaic properties of perovskite solar cell based on ZnO nanorod arrays

2016 ◽  
Vol 388 ◽  
pp. 89-96 ◽  
Author(s):  
Yang Xu ◽  
​Tian Liu ◽  
Zhaosong Li ◽  
Bingjie Feng ◽  
Siqian Li ◽  
...  
Keyword(s):  
Solar Cell ◽  
Perovskite Solar Cell ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Photovoltaic Properties

Effective CdS/ZnO nanorod arrays as antireflection coatings for light trapping in c-Si solar cells

RSC Advances ◽  
2014 ◽  
Vol 4 (44) ◽  
pp. 23149-23154 ◽  
Author(s):  
Xuxin Pu ◽  
Jie Liu ◽  
Jie Liang ◽  
Yusheng Xia ◽  
Wuliang Feng ◽  
...  
Keyword(s):  
Solar Cell ◽  
Light Trapping ◽  
Nanorod Array ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Antireflection Coatings ◽  
Si Solar Cell ◽  
Si Solar Cells ◽  
Lower Reflectance

The cell with CdS/ZnO nanorod array (NRAs) antireflection coatings exhibits lower reflectance and better light trapping ability than the c-Si solar cell.

A patterned ZnO nanorod array/gas sensor fabricated by mechanoelectrospinning-assisted selective growth

2015 ◽  
Vol 51 (15) ◽  
pp. 3117-3120 ◽  
Author(s):  
Xiaomei Wang ◽  
Fazhe Sun ◽  
Yongan Huang ◽  
Yongqing Duan ◽  
Zhouping Yin
Keyword(s):  
Gas Sensor ◽  
Nanorod Array ◽  
Selective Growth ◽  
Hydrothermal Growth ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
Growth Method ◽  
Zno Nanorod Array

Micropatterned ZnO nanorod arrays fabricated by mechanoelectrospinning and the hydrothermal growth method exhibited excellent sensitivity response to NO2.

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