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Fano resonances in heterogeneous dimers of silicon and gold nanospheres

Frontiers of physics 2018年第3期13卷 121-127页

作者： Qian Zhao Zhong-Jian Yang Jun He Hunan Key Laboratory of Super Microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha 410083 China

We theoretically investigate the optical properties of dimers consisting of a gold nanosphere and a silicon nanosphere. The absorption spectrum of the gold sphere in the dimer can be significantly altered and exhibits a pronounced Fano profile. Analytical Mie theory and numerical simulations show that the Fano profile is induced by constructive and destructive interference between the incident electric field and the electric field of the magnetic dipole mode of the silicon sphere in a narrow wavelength range. The effects of the silicon sphere size, distance between the two spheres, and excitation configuration on the optical responses of the dimers are studied. Our study reveals the coherent feature of the electric fields of magnetic dipole modes in dielectric nanostructures and the strong interactions of the coherent fields with other nanophotonic structures.

关键词： silicon nanosphere gold nanosphere magnetic dipole resonance Fano resonance Mie theory

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Electrochemical biosensor employing PbS colloidal quantum dots/Au nanospheres-modified electrode for ultrasensitive glucose detection

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Nano Research 2023年第3期16卷 4085-4092页

作者： Yunong Zhao Jing Huang Qing Huang Yanbing Tao Ruiqin Gu Hua-Yao Li Huan Liu School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsOptics Valley LaboratoryHuazhong University of Science and TechnologyWuhan 430074China

Rapid and accurate detection of glucose is of great significance for diabetic *** sensitive glucose sensors promise to achieve noninvasive detection technology,enabling more convenient and efficient means for large-scale screening and long-term dynamic monitoring of diabetes *** this work,we demonstrate a sensitive glucose electrochemical biosensor through the synergetic labelling strategy utilizing PbS colloidal quantum dots(CQDs)and Au nanospheres(AuNSs).The PbS CQDs/AuNSs/glucose oxidase(GOx)mixture could be stably immobilized on the carbon electrode surface via the onestep dip-coating *** electrochemical biosensor employing PbS CQDs/AuNSs/GOx-modified electrode integrates the functions of specific molecule recognition,signal transduction as well as signal *** sensor is capable of transducing the glucose enzyme-catalyzed reaction into significant current signals,exhibiting a good linear response in the glucose concentration range of 0.1μM-10 mM with the limit of detection being 1.432 nM.

关键词： colloidal quantum dot gold nanosphere ligand exchange electrochemical glucose biosensor electronic labelling

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Hierarchical Nanogold Labels to Improve the Sensitivity of Lateral Flow Immunoassay

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Nano-Micro Letters 2018年第2期10卷 67-74页

作者： Kseniya Serebrennikova Jeanne Samsonova Alexander Osipov Chemistry Faculty Lomonosov Moscow State University National University of Science and Technology ‘‘MISiS’’

Lateral flow immunoassay(LFIA) is a widely used express method and offers advantages such as a short analysis time, simplicity of testing and result ***, an LFIA based on gold nanospheres lacks the desired sensitivity, thereby limiting its wide *** this study, spherical nanogold labels along with new types of nanogold labels such as gold nanopopcorns and nanostars were prepared, characterized, and applied for LFIA of model protein antigen procalcitonin. It was found that the label with a structure close to spherical provided more uniform distribution of specific antibodies on its surface, indicative of its suitability for this type of *** using gold nanopopcorns as a label allowed procalcitonin detection over a linear range of 0.5–10 ng mL^(-1) with the limit of detection of 0.1 ng mL^(-1), which was fivefold higher than the sensitivity of the assay with gold nanospheres. Another approach to improve the sensitivity of the assay included the silver enhancement method,which was used to compare the amplification of LFIA for procalcitonin detection. The sensitivity of procalcitonin determination by this method was 10 times better the sensitivity of the conventional LFIA with gold nanosphere as a label. The proposed approach of LFIA based on gold nanopopcorns improved the detection sensitivity without additional steps and prevented the increased consumption of specific reagents(antibodies).

关键词： Lateral flow immunoassay gold nanosphere gold nanopopcorn gold nanostar Silver enhancement Procalcitonin

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Interfacial Engineering of Au@Nb2CTx-MXene Modulates the Growth Strain,Suppresses the Auger Recombination,and Enables an Open-Circuit Voltage of over 1.2 V in Perovskite Solar Cells

Interfacial Engineering of Au@Nb2CTx-MXene Modulates the Gro...

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第十一届新型太阳能材料科学与技术学术研讨会

作者： Shuainan Liu Hongwei Song State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin University

Defects at the interface of charge transport layers can cause severe charge accumulation and poor charge transferability,which greatly affect the efficiency and stability of stannic oxide （SnO）-based perovskite solar cells （PSCs）.Herein,a new type of MXene （NbCTMXene） is applied to the interface of SnO layers to passivate the interfacial defects and promote charge ***-MXene in PSCs realizes the role of boosting the conductivity,reducing the tin vacancies in the interstitial void of the SnO layer,decreasing the defect density,and aligning the ***,NbCT-MXene is decorated with gold nanospheres,which has the ability to modulate the tensile strain of perovskites and suppress the Auger ***,the Au@NbCT-MXene-modified device yields an excellent power conversion efficiency （PCE） of 23.78%with a relatively high open-circuit voltage of 1.215 V （E～1.60 eV）.The unencapsulated devices maintain 90%of their initial PCE values after storage in the air with a relative humidity of 40%for 1000 h and remain above 80%of their initial efficiency after operation at the maximum power point for 500 h under 1 sun *** work provides an avenue to fabricate high-efficiency and stable PSCs with MXene adapting to commercial development.

关键词： MXene gold nanosphere perovskite solar cells tensile strain high open-circuit voltage interfacial engineering

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