Nanotechnology

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ISSN / EISSN : 09574484 / 13616528
Current Publisher: IOP Publishing (10.1088)
Total articles ≅ 17,863
Google Scholar h5-index: 66
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Zhong Ouyang, Yun Lei, Liqun Luo, Zicong Jiang, Jiaxin Hu, Yuanyuan Lin
Published: 18 November 2019
Nanotechnology; doi:10.1088/1361-6528/ab589c

Abstract:Cadmium selenide and S, N co-doped graphene quantum dots (CdSe/S, N-GQDs) nanocomposites were synthesized via a solvothermal method. The results show that S, N-GQDs have a grain size of around 5 nm and an average height of 0.5 nm, which contains only 1-2 layers of graphene sheets. The CdSe/S, N-GQDs composites exhibit distinct lattice fringes with a layer spacing of 0.24 and 0.35 nm, corresponding to (1120) and (111) crystal planes of S, N-GQDs and the cubic CdSe, respectively. The photoelectric properties of CdSe/S, N-GQDs were evaluated under ultraviolet light (365 nm) irradiation. Compared with CdSe and CdSe/GQDs, CdSe/S, N-GQDs composites have the largest photocurrent density of 4.286×10-5 A/cm2, which is about 10.5 times and 7.5 times as high as that of CdSe and CdSe/GQDs, respectively. The increase in photocurrent density of CdSe/S, N-GQDs can be attributed to the incorporation of S and N to promote separation of photogenerated carriers. Moreover, S, N-GQDs are nano-fragments of graphene, which can provide a larger specific surface area and greatly increase the contact surface with CdSe. In addition, the photoelectric properties of CdSe/S, N-GQDs composites can be adjusted by varying the doping ratio. When the doping ratio is 1:1, CdSe/S, N-GQDs have the best photoelectric performance.
Doo-Hyeb Youn, Bong-Jun Kim, Sun Jin Yun
Published: 18 November 2019
Nanotechnology; doi:10.1088/1361-6528/ab58a9

Abstract:A gas sensor based on a hierarchical WS2 structure embedded with the vertically aligned WS2 nanocrystallites was demonstrated. The three-dimensional (3D) hierarchical structure provides many edge sites of nanocrystallites and an extremely large gas contact volume, resulting in a high gas response. The decreased contact resistance between the 3D hierarchical WS2 fibers and sensor electrode resulting in improved NO2 response. We fabricated a one-dimensional (1D) conductive WS2 fiber using a two-step annealing process under sulfur flow (sulfurization). It delivers a continuous and conductive carrier path and lowers the potential barrier at the interface of the WS2 nanocrystallites (top) and electrospun WS2 fiber (bottom), resulting in an improved gas response. We developed 3D hierarchical WS2 fibers embedded with vertically aligned WS2 nanocrystallites to increase the gas adsorption site in comparison with that of 1D WS2 fibers without WS2 flakes. Vertically aligned WS2 nanocrystallites were formed after a two-step annealing treatment. Sensors based on the 3D hierarchical WS2 fibers embedded with WS2 flakes, showed higher response to NO2 gas in comparison to that of pure WS2 fibers without WS2 flakes.
Yanjie Wang, Min Li, Yizhuo Gu, Shaokai Wang, Qingwen Li, Zuoguang Zhang
Published: 18 November 2019
Nanotechnology, Volume 31; doi:10.1088/1361-6528/ab50a4

Abstract:Inspired by the chemical and physical doping methods on traditional composite, bismaleimide (BMI) resin and graphene oxide (GO) are selected for doping modification of CNT film in this paper. Based on diverse enhancement effects of CNT film, the mechanisms and characteristics of resin crosslink and inorganic doping are compared. Due to the crosslinking network of resin, BMI is more beneficial for the cooperative deformation and mechanical enhancement. While GO doping shows more advantages in improving electrical performance because of plenty of functional groups on surface and good intrinsic properties. With appropriate doping method and optimized process conditions, tensile property and electrical conductivity of CNT film can be improved by over 150% and 200% (e.g. tensile strength and modulus of 2990 MPa and 149 GPa, and electrical conductivity of 38700 S/m).
Xitong Liang, Dongfeng Xue
Published: 18 November 2019
Nanotechnology, Volume 31; doi:10.1088/1361-6528/ab51c6

Abstract:To meet growing demands for energy consumptions in modern society, it is necessary to develop different energy sources. Renewable energy such as wind and solar sources are intermittent, therefore, energy storage devices become more and more important to store energy for use when no wind or no light. Supercapacitors play a key role in energy storage, mainly due to their high power density and long cycling life. However, supercapacitors are facing the obstacle of low energy density, one of the most intensive approaches is to rationally design new electrode materials. In this review, we focus on metal oxides-based materials and present an electronegativity criterion for the design and appropriate selection of new electrode chemical compositions. Metal elements with proper electronegativity scale have the potential to transfer electron for energy storage. Suitable positive and negative electrodes matching can enhance many properties of supercapacitors, which may overcome many related obstacles. Furthermore, electronegativity scale may also help people to find novel metal oxides based supercapacitors.
Aleksandra Szkudlarek, Katarzyna E Hnida-Gut, Kamila Kollbek, Mateusz M Marzec, Krzysztof Pitala, Marcin Sikora, Katarzyna Elżbieta Hnida
Published: 18 November 2019
Nanotechnology, Volume 31; doi:10.1088/1361-6528/ab53bd

The publisher has not yet granted permission to display this abstract.
Weisheng Yue, Vasyl G. Kravets, Mingbo Pu, Changtao Wang, Zeyu Zhao, Zhirun Hu
Published: 15 November 2019
Nanotechnology, Volume 30; doi:10.1088/1361-6528/ab3b69

The publisher has not yet granted permission to display this abstract.
Mengxing Sun, Haowen Hu, Dan Xie, Yilin Sun, Jianlong Xu, Weiwei Li, TianLing Ren, Hongwei Zhu
Published: 15 November 2019
Nanotechnology; doi:10.1088/1361-6528/ab5820

Abstract:Two-dimensional (2D) materials such as graphene and MoS2 have shown great potential in photodetection platforms. Photoresponsivity and photoresponse speed are two important parameters illustrating photodetector performances. Although various hybrid structures have been designed, the trade-off between photoresponsivity and photoresponse speed has not been well balanced. In this work, MoS2 film and In(OH)xSe nanoparticles are combined together to form the hybrid phototransistor. Utilizing both the photoconducting and photogating effects, the photoresponsivity increases about one order of magnitude with a value of 102 A/W. The ratio of photocurrent and dark current increases to a value of 104. Considering the slow photo recovery speed, a 2 ms gate voltage pulse is applied after turning off the light, which results in a complete recovery of current. The photoconducting effect, photogating effect and gate voltage stimulation simultaneously promote the superior comprehensive photoresponse performances. This method can be further explored and utilized for realizing high performance photodetectors.
Cheng-Jin Cai, Yao-Tseng Wang, Chia-Chun Ni, Ruei-Nan Wu, Chien-Yu Chen, Yean-Woei Kiang, C. C. Yang
Published: 15 November 2019
Nanotechnology; doi:10.1088/1361-6528/ab5826

Abstract:With two different residual surfactants, four different metal nanoparticles (NPs), including two Au NPs and two Ag NPs are synthesized for linking with red-emitting CdZnSeS/ZnS colloidal quantum dots (QDs) to enhance QD emission efficiency. Those metal NPs are first connected with amino polyethylene glycol thiol of different molecular weights to avoid aggregation and make them positively charged. They can attract negatively charged QDs for inducing surface plasmon (SP) coupling such that either QD absorption or emission and hence overall color conversion efficiency can be enhanced. The enhancement of QD emission efficiency is evaluated through the comparison of time-resolved photoluminescence behaviors under different QD linkage conditions. Such results are confirmed by the measurement of the emission quantum efficiency of QD. It is found that by linking QDs onto Ag NPs, the QD emission efficiency is more enhanced, when compared with Au NPs. Also, depending on the synthesis process, the residual surfactant of citrate leads to a relatively larger increment in QD emission efficiency, when compared to the surfactant of cetrimonium chloride. A more enhanced QD emission efficiency is caused by a higher QD linkage capability and a stronger SP coupling effect.
Dong Hee Shin, Seung Hyun Shin, Sung Kim, Suk-Ho Choi
Published: 15 November 2019
Nanotechnology; doi:10.1088/1361-6528/ab5838

Abstract:Recently, conducting polymer/Si hybrid solar cells (HSCs) based on simple fabrication processes are highly attractive due to their low cost, but low conductivity of the polymer, high reflection index of Si, and large recombination loss on the Si back contact are major drawbacks that should be solved for the practical applications. Here, we first report HSCs composed of graphene quantum dots (GQDs)-mixed poly (3,4-ethylenedioxythiophene) (PEDOT:GQDs)/ porous Si (PSi)/n-Si/titanium oxide (TiOx, back passivation layer). Maximum power conversion efficiency (PCE) of 10.49 % is obtained from the HSCs at an active area of 5 mm2, resulting from the enhanced conductivity of the PEDOT:GQDs, the reduced reflectivity of Si (the increased absorption) by the formation of PSi, and the prevented recombination loss at the Si backside due to the passivation. In addition, the HSCs of 16 mm2 active area maintain ~78 % (absolutely from 8.03 to 6.28 %) of the initial PCE even while kept under ambient conditions for 15 days.
Ying Li, Jialiang Ye, Kai Yuan, Guihao Zhai, Ting Li, Yu Ye, X G Wu, Xinhui Zhang
Published: 15 November 2019
Nanotechnology; doi:10.1088/1361-6528/ab5835

The publisher has not yet granted permission to display this abstract.