JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 53
·期 20
·14456-14468
·
IF 2.993
Dou Qianqian,Wong Ka Wai,Li Yang,Ng Ka Ming
The localized surface plasmon resonance (LSPR) behavior of indium-doped ZnO (IZO) nanocrystals synthesized in different solvents was studied. 1-octadecanol, oleic acid, oleyl alcohol, oleyl amine and 1-octadecene were used as solvent(s) and co-solvent(s) in the pyrolysis synthesis of indium-doped ZnO (IZO) nanoparticles. The results showed that the nanocrystals from a solvent system consisting of 1-octadecene, 1-octadecanol, and oleic acid exhibited enhanced LSPR near-infrared radiation absorption without sacrificing transparency in the visible region. The indium-rich core verified using ICP and XPS analysis was shown to be critical for the enhancement. The reaction mechanism of solvents on the generation of indium-rich core was elucidated through a systematic study of the reaction parameters. The interaction between the activating agent, inhibiting agent and solvent, and their effect on tuning the reactivity of dopant and host precursors were important for the formation of a nanostructure with a dopant-rich core. The solvent effect was also found in the synthesis of gallium-doped ZnO and confirmed to be a general phenomenon in the preparation of doped ZnO nanoparticles.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
DOI
高影响因子
Nanoscale
·
2023
·Vol. 15
·期 25
·10826-10833
·
IF 6.7
Huimin Wang,Tao Wang,Simei Zhong,Jinyan Zhang,Ruoqin Yan,Peng Xu,Yu-hui Zhang,Xinzhao Yue,Lu Wang,Yuandong Wang,Xuyang Yuan,Jinwei Zeng,Jian Wang
Gold nanoparticles (AuNPs) can be used to improve the performance of propagating surface plasmon resonance (PSPR) refractive index sensors. The resonant coupling effect between PSPR and localized surface plasmon resonance (LSPR) supported by AuNPs on sensitivity remains to be elucidated in terms of evanescent field intensity and distribution. In this study, we directly compare the sensitivity of the PSPR sensor and the resonant coupling mode between the PSPR and LSPR sensors in the wavelength scanning mode. The sensitivity of PSPR can be significantly improved in the near-infrared region excitation wavelength. 1,6-Hexanedithiol was used to achieve a AuNP modified gold film (GF-AuNP). The PSPR excited by the prism coupling mechanism can effectively stimulate LSPR supported by AuNPs in the GF-AuNP, and then resonant coupling is generated. Compared with PSPR, the resonant coupling mode shows a decrease in penetration depth by 28 times and an increase in the surface electric field intensity by 4.6 times in the numerical simulations. The decrease in the penetration depth in the GF-AuNP is made at the expense of bulk sensitivity. The biosensing sensitivity of the GF-AuNP shows up to 7-fold improvement in the carcinoembryonic antigen immunoassay and the GF-AuNP is proven to be a better biosensor. The experimental measurements are in excellent agreement with the theoretical model. This study can be also considered as a guide for the design of plasmonic sensors for detecting multiple substances at different scales, such as cells and proteins.
研究领域:
光学
·
纳米技术
·
生物传感器
·
等离子体学
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2023
·Vol. 10
·期 12
·3648-3655
·
IF 7
Xiangyu Meng,Jian Yu,Jingjing Wu,Yuening Wang,Xiaoyu Song,Ziyan Xu,Anran Li,Lin Qiu,Jie Lin,Xiaotian Wang
The effective monitoring of trace carcinogens in the environment and daily necessities is very important for humans. Here, Ag-loaded iron hydroxide (Ag/Fe(OH)3) was designed as an excellent surface-enhanced Raman scattering (SERS) substrate and used for the trace detection of carcinogenic aromatic amine p-aminoazobenzene (PAAB). Due to the weak binding ability of Fe3+ with OH−, Fe(OH)3 presents a strong coordination ability with Ag than Co(OH)2 and Ni(OH)2, resulting in the prominent adjustability of Ag/Fe(OH)3, including the localized surface plasmon resonance (LSPR) property and energy band structure. On the one hand, the dielectric environment of Ag nanoparticles is changed due to the coordination effect of Ag and OH−, among which the LSPR of Ag/Fe(OH)3 in the visible region is significantly enhanced. On the other hand, the energy band gap of Ag/Fe(OH)3 is reduced by increasing the content of Ag, achieving effective photo-induced charge transfer (PICT) under excitation at 633 nm. Comprehensively, an enhancement factor (EF) of 1.23 × 106 was achieved for 4-ATP molecules through the synergistic interaction of LSPR and PICT. Importantly, Ag/Fe(OH)3 presents an ultra-low detection limit for PAAB (10−9 M), which is of great significance for the trace detection of carcinogenic aromatic amines.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2020
·
IF 7.1
Mengdi Lu,Hu Zhu,Ming Lin,Fang Wang,Long Hong,Jean-Francois Masson,Wei Peng
Block copolymer (BCP) brush-like layer absorbed on optical fibers are shown to address the longstanding challenge of forming dense and well-dispersed gold nanorods (AuNRs) films on highly curved surface, allowing the development of real-time localized surface plasmon resonance (LSPR) biosensors for antigen-antibody interaction. This method requires only solution-based manufacturing processes and a plasma cleaning step to self-assemble AuNRs with various aspect ratios on the optical fibers. Because AuNRs capped with cetyltrimethylammonium bromide (CTAB) have been problematic for biosensing applications due to their cytotoxicity and displacement difficulty in the construction of biosensors, citrate-stabilized AuNRs were prepared from CTAB-stabilized AuNRs via surfactant exchange. For comparison, both a poly(styrene)- b -poly(acrylic acid) (PS- b -PAA) BCP template with CTAB-stabilized AuNRs and a poly(styrene)- b -poly(4-vinyl pyridine) (PS- b -P4VP) BCP template with citrate-stabilized AuNRs were employed for the fabrication of the optical fiber biosensor. The LSPR spectral analysis results demonstrate that the sensitivity of the sensor produced by the PS- b -P4VP templating method was 1.5 times better than that of the sensor produced by the PS- b -PAA templating method, which was due to the improved surface coverage and reduced aggregation of nanoparticles. The detection limit of the PS- b -P4VP-templated sensor for human IgG was 0.6 nM. Furthermore, for citrate-stabilized AuNRs, the PS- b -P4VP templating method also led to a better surface morphology and higher sensitivity as compared to the standard particle absorption methods using alkoxysilanes or polyelectrolytes on identical fibers. The simplicity of the fabrication process and the far superior optical performance of the PS- b -P4VP-templated LSPR optical fiber sensor illustrate the ability to regulate the detection range by tuning the aspect ratios of the AuNRs, and demonstrate its application prospects as a real-time biosensor without cytotoxicity.
研究领域:
材料科学
·
纳米技术
·
光学传感
·
生物传感器
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2023
·
IF 6.1
Zixuan Ding,Peilin Wang,Zhenrun Li,Yupeng Guo,Qiang Ma
The combination of highly sensitive electrochemiluminescence (ECL) techniques with localized surface plasmon resonance (LSPR) effect can achieve the highly sensitive and specific detection in the analytical and biosensing applications. However, how to effectively improve the electromagnetic field intensity is an unresolved issue. Herein, we have developed an ECL biosensor based on sulfur dots and [email protected] nanorod array architecture. Firstly, the high luminescent sulfur dots with ionic liquid capping (S dots (IL) have been prepared as the new ECL emitter. The ionic liquid greatly improved the conductivity of sulfur dots in the sensing process. Furthermore, [email protected] nanorods array structure was constructed on the electrode surface by the evaporation induced self-assembly. On the one hand, the LSPR of [email protected] nanorods was more significant than that of good nanomaterial due to the plasma hybridization and the competition between free electrons and oscillating electrons. On the other hand, nanorods array structure had strong electromagnetic field intensity as hot spots due to the surface plasmon coupling ECL effect (SPC-ECL) effect. Therefore, the Au @Ag nanorods array architecture not only greatly enhanced the ECL intensity of sulfur dots, but also changed the ECL signals into polarized emission. Finally, the constructed polarized ECL sensing system was used to detect the mutated BRAF DNA in the eluent of thyroid tumor tissue. The biosensor showed the linear range from 100 fM to 10 nM with a detection limit of 20 fM. The satisfactory results demonstrated that the developed sensing strategy had great potential in the clinical diagnosis of BRAF DNA mutation in thyroid cancer.
研究领域:
分析化学
·
生物传感
·
纳米技术
·
癌症诊断
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2021
·Vol. 12
·期 16
·2439-2446
·
IF 5.582
Junle Zhang,Mengya Li,Yanjie He,Xiaomeng Zhang,Zhe Cui,Peng Fu,Minying Liu,Xiaoguang Qiao,Qingxiang Zhao,Xinchang Pang
Gold (Au) nanocrystals were recognized to be a remarkable photocatalyst because of their strong localized surface plasmon resonance (LSPR). Here Au nanocrystals were exploited as plasmonic photocatalysts for photo-regulated reversible addition–fragmentation chain-transfer (RAFT) polymerization. In addition to the well-controlled RAFT polymerization process under a broadband of light (from visible to the near-infrared region), the dimension (0-D nanospheres and 1-D nanorods) and aspect ratio (length/width) of the nanocrystals exhibited a remarkable effect on the polymerization rate under different light sources. The reduction of plasmon damping leads to a relatively long-lived region of high electron density on the surface of the Au nanorods, which can accelerate charge transfer and induce a higher polymerization rate. Moreover, the aspect ratio related to the longitudinal absorption band of the Au nanorods may provide more flexible choices for advanced macromolecular photosynthesis for potential in biomedical and industrial applications.
研究领域:
材料科学
·
纳米技术
·
光催化
·
聚合物化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2021
·Vol. 11
·期 21
·7060-7071
·
IF 6.119
Kaiyue Zhang,Guilong Lu,Feng Chu,Xiubing Huang
Thermo-enhanced photocatalysis has been reported as a potential strategy for improving the activity, whereas the relationship between thermal energy and the localized surface plasmon resonance (LSPR) effect of noble metal nanoparticles has been rarely investigated. Herein, photocatalytic selective aerobic oxidation of amines to imines is investigated under visible light irradiation over heterostructured TiO2(B)/anatase and Au/TiO2 nanobelts at specific temperatures (20–60 °C). The surface amine substrate complexed on TiO2 could broaden the visible-light absorption region via the ligand-to-metal charge transfer (LMCT) effect. Interestingly, the pristine TiO2 achieves the best photocatalytic performance (>99% benzylamine conversion and >99% N-benzylidenebenzylamine selectivity) at 60 °C after 12 h irradiation while the Au nanoparticles (NPs) are observed to improve the activity of TiO2 only in a low temperature range (<40 °C). Moreover, excessive Au NPs loaded on TiO2 could inhibit the amine conversion and reduce the imine selectivity in the whole temperature range of 20–60 °C, which is attributed to the decreased oxygen vacancies and poor amine adsorption ability on the surface of Au/TiO2. A plausible explanation is finally proposed that the substrate–TiO2 complex, instead of plasmonic Au NPs, plays a vital role in achieving good amine conversion and imine selectivity.
研究领域:
光催化
·
材料科学
·
化学工程
·
物理化学
✓ 已验证
DOI
高影响因子
Photonics Research
·
2020
·Vol. 8
·期 4
·548-563
·
IF 6.099
Bin Wang,Chen Zhao,Huanyu Lu,Tingting Zou,Subhash C. Singh,Zhi Yu,Chaonan Yao,Xin Zheng,Jun Xing,Yuting Zou,Cunzhu Tong,Weili Yu,Bo Zhao,Chunlei Guo
Localized surface plasmon resonance (LSPR) of nanostructures and the interfacial charge transfer (CT) of semiconductor materials play essential roles in the study of optical and photoelectronic properties. In this paper, a composite substrate of Ag2S quantum dots (QDs) coated plasmonic Au bowtie nanoantenna (BNA) arrays with a metal–insulator–metal (MIM) configuration was built to study the synergistic effect of LSPR and interfacial CT using surface-enhanced Raman scattering (SERS) in the near-infrared (NIR) region. The Au BNA array structure with a large enhancement of the localized electric field (E-field) strongly enhanced the Raman signal of adsorbed p-aminothiophenol (PATP) probe molecules. Meanwhile, the broad enhanced spectral region was achieved owing to the coupling of LSPR. The as-prepared Au BNA array structure facilitated enhancements of the excitation as well as the emission of Raman signal simultaneously, which was established by finite-difference time-domain simulation. Moreover, Ag2S semiconductor QDs were introduced into the BNA/PATP system to further enhance Raman signals, which benefited from the interfacial CT resonance in the BNA/Ag2S-QDs/PATP system. As a result, the Raman signals of PATP in the BNA/Ag2S-QDs/PATP system were strongly enhanced under 785 nm laser excitation due to the synergistic effect of E-field enhancement and interfacial CT. Furthermore, the SERS polarization dependence effects of the BNA/Ag2S-QDs/PATP system were also investigated. The SERS spectra indicated that the polarization dependence of the substrate increased with decreasing polarization angles (θpola) of excitation from p-polarized (θpola=90°) excitation to s-polarized (θpola=0°) excitation. This study provides a strategy using the synergistic effect of interfacial CT and E-field enhancement for SERS applications and provides a guidance for the development of SERS study on semiconductor QD-based plasmonic substrates, and can be further extended to other material-nanostructure systems for various optoelectronic and sensing applications.
研究领域:
光学
·
光子学
·
材料科学
·
纳米技术
·
光谱学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
·
2022
·
IF 6.814
Guojuan Yan,Bo Kong,Jiaqiang Zhao,Huanhuan Ni,Lei Zhan,Chengzhi Huang,Hongyan Zou
The application of nanostructures to design fluorescence resonance energy transfer (FRET) based sensing platforms has been greatly concerned with the demand for sensitive and selective detection of biomolecules. Here, a novel sensitive turn-on fluorescence strategy based on the FRET mechanism has been designed for hyaluronidase (HAase) detection through the modulation of Cu 2-x Se@HA-Rh6G nanoprobe fabricated by self-assembly of rhodamine 6G (Rh6G) together with Cu 2-x Se@HA nanoparticles through electrostatic adsorption. The Cu 2-x Se@HA had extensive localized surface plasma resonance (LSPR) absorption in the wide range of ultraviolet (UV) to near-infrared (NIR) wavelengths and showed good light capture characteristics, which can be acted as good acceptors in the FRET interactions with Rh6G , inducing its efficient fluorescence quenching . In the presence of HAase, the FRET process was disrupted and the fluorescence signal was recovered. In the range of 0.1–10.0 U/mL, the fluorescence recovery of Rh6G showed a good linear relationship with the concentration of HAase, and the detection limit was 0.06 U/mL. The sensing platform has been used for HAase detection in real urine samples and cancer cells imaging.
研究领域:
纳米技术
·
生物传感
·
生物医学工程
·
分析化学
·
分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2023
·
IF 4.4
Hui-fang Du,Jian Zhu,Guo-jun Weng,Jian-jun Li,Xin Li,Jun-wu Zhao
Ligand-mediated interface control has been broadly applied as a powerful tool in constructing asymmetric multicomponent nanoparticles (AMNP), and induces the anisotropic growth with fine-tuning morphology, composition, plasmonic property and functionality. As a new kind of AMNP, the synthesis of Janus Au-Ag nanoparticles with tunable negative surface curvature is still a challenge. Here, we demonstrate that the synergistic surface energy effects between gold nanodumbbells (Au NDs) with a negative surface curvature and 4-mercaptobenzoic acid (4-MBA) can direct the site-selective growth of anisotropic silver domains on gold nanodumbbells (Au NDs@Ag NPs). By adjusting the 4-MBA concentration-dependent interfacial energy, the Au NDs@Ag NPs could be continuously tuned from dumbbell-like core–shell structures, to L-shaped Janus, and then rod-like core–shell structures with directional and asymmetric spatial distributions of resizable Ag domains by site-selective growth. Based on the calculation results of discrete dipole approximation (DDA) method, it has been found that the Au NDs@Ag L-shaped Janus NPs with Ag island domains created polarization orientation-dependent plasmonic extinction spectra and hot spots around the negatively curved waist and Ag domains. The L-shaped Janus Au NDs@Ag NPs exhibited significantly plasmonic spectrum properties with four apparent LSPR peaks that cover from visible to near-infrared range and higher surface-enhanced Raman scattering (SERS) activity compared with the original Au NDs. The best SERS enhancement factor of 1.41 × 10 7 was achieved. This synergistic surface energy effect-based method involving the asymmetric growth of silver coating on gold nanoparticles with negatively curved surface presents a new method to design and fabricate nanometer optical devices based on asymmetric multicomponent nanoparticles.
研究领域:
纳米技术
·
材料科学
·
光学
·
化学
·
表面等离子体共振
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FOOD CHEMISTRY
·
2020
·
IF 6.306
Bolong Fang,Shaolan Xu,Youju Huang,Fengmei Su,Zhen Huang,Hao Fang,Juan Peng,Yonghua Xiong,Weihua Lai
In this study, we developed an indirect competitive plasmonic immunoassay using glucose oxidase (GOx)-induced redox reaction to etch Au nanorods (AuNRs) for qualitative and quantitative detection of aflatoxin M1 (AFM1) in milk. In this system, streptavidin (SA) was selected as a linker between biotinylated anti-AFM1-monoantibody (bio-mAb) and biotinylated GOx (bio-GOx) to form the immunocomplexes bio-mAb-SA-bio-GOx. After the oxidation of the glucose and I - , the resultant I 2 could etch cetytrimethylammonium bromide (CTAB)-stabilized AuNRs . This resulted in the blue shift of the longitudinal localized surface plasmon resonance (LSPR) extinction peak, with a color change from blue to pink. The linear range and limit of detection (LOD) of the plasmonic immunoassay were 0.25–10 ng mL −1 and 0.11 ng mL −1 , respectively. It displayed quantitative detection with high sensitivity, specificity, recovery, and accuracy, which is promising for qualitative and quantitative detection of AFM1 in food safety.
研究领域:
纳米技术
·
分析化学
·
食品科学
·
毒理学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Yue Tian,Qingqiang Cui,Linlin Xu,Anxin Jiao,Shuang Li,Xuelin Wang,Ming Chen
The unique hot carrier-driven direct plasmonic photocatalysis of coinage metal nanomaterials (NMs) via energetic localized surface plasmon resonance (LSPR) in visible-light region has been explored in recent years. However, the low photoinduced electron transfer efficiency and insufficient separation of electron-hole pairs would severely preclude their widespread practical applications. Herein, we demonstrate an interesting plasmonic photocatalyst based on the construction of icosahedral (Ih) Au@C 60 core-shell NMs, taking advantage of specific delocalized π electrons structure of a tight C 60 shell and enhanced LSPR property of Ih Au core. Then, the pronounced interfacial interaction at junction region endows the obtained Au@C 60 NMs with an outstanding photoinduced hot carrier-transmission during photocatalytic reaction, facilitating a remarkably higher (1.89 times) photocatalytic activity toward visible-light driven degradation of crystal violet (CV) dyes, as compared to bare Au NMs. Impressively, the photocatalytic activity of Ih Au@C 60 NMs can be effectively optimized by changing the pH value of reaction solution, with the kinetic rate constant reaching the maximum value of 0.179 min −1 in pH 0 11.4 solution, while 0.005 min −1 at pH 0 3.0. Moreover, due to the protection of a tight C 60 shell, the Ih Au@C 60 NMs also possess excellent photocatalytic stability/reusability in recycling runs, holding great potential for the design of robust and high-performance plasmonic photocatalysts in repeated practical applications.
研究领域:
材料科学
·
纳米技术
·
光催化
·
等离子体学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）