MOLECULES
·
2021
·Vol. 26
·期 22
·6849
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IF 4.412
Yan Fan,Tao Wang,Yinwei Qiu,Yinli Yang,Qiubo Pan,Jun Zheng,Songwei Zeng,Wei Liu,Gang Lou,Liang Chen
Graphene p-n junctions have important applications in the fields of optical interconnection and low–power integrated circuits. Most current research is based on the lateral p-n junction prepared by chemical doping and other methods. Here, we report a new type of pure graphene oxide (pGO) vertical p-n junctions which do not dope any other elements but only controls the oxygen content of GO. The I–V curve of the pGO vertical p–n junction demonstrates a remarkable rectification effect. In addition, the pGO vertical p–n junction shows stability of its rectification characteristic over long-term storage for six months when sealed and stored in a PE bag. Moreover, the pGO vertical p–n junctions have obvious photoelectric response and various rectification effects with different thicknesses and an oxygen content of GO, humidity, and temperature. Hall effect test results show that rGO is an n–type semiconductor; theoretical calculations and research show that GO is generally a p–type semiconductor with a bandgap, thereby forming a p–n junction. Our work provides a method for preparing undoped GO vertical p–n junctions with advantages such as simplicity, convenience, and large–scale industrial preparation. Our work demonstrates great potential for application in electronics and highly sensitive sensors.Keywords:undoped p–n junction;vertical p–n junction;graphene oxide
研究领域:
材料科学
·
电子工程
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产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Abdelfattah Amari,Basem Alalwan,Saifeldin M. Siddeeg,Mohamed A. Tahoon,Norah Salem Alsaiari,Faouzi Ben Rebah
Recently, carbon-doped nanomaterials attract attention due to their unconventional properties as doping completely changes their properties. Herein, we try to compare the electrochemical response of the prepared boron-doped graphene nanosheets and un-doped graphene nanosheets modified glassy carbon electrodes toward some interesting biomolecules like ascorbic acid, uric acid, and dopamine. There are significant differences of prepared doped and un-doped graphene nanosheets toward the mentioned biomolecules. The resistance of surfaces toward fouling was studied on uric acid oxidation product in the long term. In the long term stability of the prepared materials, there are no significant differences found. As electrochemical materials, the differences between prepared materials will affect their applications.
研究领域:
纳米材料科学
·
电化学
·
生物医学工程
·
分子传感
·
转化医学
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DOI
高影响因子
Journal of Physical Chemistry C
·
2019
·
IF 4.309
Zhaofeng Zhai,Nan Huang,Bing Yang,Chun Wang,Lusheng Liu,Jianhang Qiu,Dan Shi,Ziyao Yuan,Zhigang Lu,Haozhe Song,Meiqi Zhou,Bin Chen,Xin Jiang
Microstructure engineering has aroused tremendous interest to tailor the electrochemical properties of an sp3/sp2-bonded carbon composite in the chemical sensing field. In this work, the undoped diamond/graphite (D/G) nanoplatelet is controllably synthesized without nitrogen/boron incorporation using microwave plasma chemical vapor deposition. Assisted with high-resolution transmission electron microscopy and conductive atomic force microscopy, it is revealed that the D/G composite is composed of an insulate diamond nanoplatelet stem encapsulated in highly conductive graphite shells. The three-dimensional (3D) conductive graphite edges possess high electrochemical activity, whereas the adjacent inactive diamond core could influence the adsorption of the reactant onto the graphite edges; thus, tunable electrochemical properties from the boron-doped diamond feature to the graphite feature are verified with the thickening of the surrounding graphite shells and the thinning of the diamond stem. Impressively, it is noteworthy that the undoped 3D-networked D/G-8% nanoplatelet film, with a thick diamond stem encased into thin graphite shells (∼4 nm), demonstrates improved electrochemical activity while retaining the advantages of a wide potential window (3.18 V) and low background currents (127.6 μF cm–2) as much as possible, holding great promise in electrochemical sensing fields. The D/G hybridized methodology herein paves a novel route toward designing a nanocarbon electrode with excellent electrochemical properties.
研究领域:
材料科学
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化学传感器领域
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纳米碳电极设计
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产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Chasina Wang,Fengqing Jiao,Liyuan Zhang,Yishi Wu,Chuanlang Zhan
One of the key issues of lead-free halide double perovskite nanocrystals (DPNCs) is their low photoluminescence quantum yields (PLQYs), and the PLQYs of nondoped pristine DPNCs are currently below 2%, though they can be enhanced via strategies such as ion doping or surface passivation. Herein, we report an organic–inorganic hybrid approach to significantly increase the PLQYs of nondoped pristine DPNCs. With Cs2NaBiCl6 NCs as the model, we selected methylammonium (MA+) and formamidine (FA+) as organic A-site ions and for the first time successfully synthesized the organic–inorganic hybrid in-direct bandgap DPNCs, e.g., MA2NaBiCl6 and FA2NaBiCl6. The PLQYs of the prepared Cs2NaBiCl6, MA2NaBiCl6, and FA2NaBiCl6 are 1.9%, 6.2%, and 15.4%, respectively. The enhancement of PLQYs can be due to the lattice distortion on using the unsymmetric rod-like MA+ and V-like FA+ to replace the symmetric Cs+, which yields faster charge transfer, enhanced excitation, and reduced nonradiative recombination, which are combined to make the self-trapped excited state brighter with significantly enhanced PLQYs. Overall, our results clearly demonstrate that the organic–inorganic hybrid strategy is an effective way to tune the lattice distortion and significantly enhance the emission of nondoped DPNCs, which will open doors for designing functional optoelectronic materials.
研究领域:
材料科学
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纳米技术
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光电子学
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无机化学
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无机-有机杂化材料
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半导体纳米晶体
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光物理
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）