ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuan Feng,Changfan Guo,Lin Gui,Li Liang,Feng Liao,Wanxia Huang,Kuanguo Li,Guanglei Cui,Zewen Zuo
Integrating metal nanoparticles with vanadium dioxide (VO2) is an effective means to realize active plasmonic regulation which has great application potential in optical devices that respond in real-time to external stimuli. However, the high temperature necessary for VO2 growth severely reshapes the metal nanoparticles, causing reduced refractive index (RI) sensitivity and degraded modulation performance. Herein, we construct a large-area dynamically tunable plasmonic system composed of a VO2-covered array of hexagonal gold nanoplates (AuNPLs). By introducing a SiO2 interface layer, the thermal tolerance of the AuNPLs is effectively improved, making the high RI sensitivity (∼368.3 nm/RIU at 855 nm) survive the subsequent VO2 deposition. Through tuning the localized surface plasmon resonance (LSPR) of the AuNPL array and the thickness of the VO2 film, the LSPR-related transmission dip can be tailored to the near-infrared region where VO2 shows a large two-phase RI contrast, a dip shift up to 272 nm is therefore realized upon VO2 phase transition. Furthermore, electro-optic modulation is demonstrated through electrically triggered VO2 partial phase transition which is accompanied by a gradually changed effective dielectric permittivity, and a continuous shift of the transmission dip from 1070 to 860 nm is achieved by varying the applied electrical current flowing through the film. This work provides a feasible route for controllably constructing stimuli-response optical devices with large wavelength modulation amplitude.
研究领域:
光学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2024
·
IF 3.9
Dandan Li,Wenrong Zhao,Gang Li,Yan Xu,Liang Xu,Bo Tang
Graphical Two novel star-shaped fluorophores named PDI−S and PDI−Se are constructed by S/Se-fused perylene diimides (PDIs) connected with bicarbazole core. Particularly, PDI−S presents excellent two-photon absorption cross-action (δ TPA ) of 3775 GM excited with 800 nm light, which is the highest value based on PDIs motif in the NIR−I region (700–900 nm). Two-photon absorption (TPA) has attracted growing attention over recent years owing to the wide range of applications in organic nonlinear optical (NLO) materials. The quantitative sensitivity of a two-photon molecular entity is determined by its TPA cross-section (δ TPA ). Perylene diimides (PDIs) are excellent n-type organic semiconductor materials demonstrating distinguished thermal, optical, and chemical stability. Nonetheless, PDIs-based scaffolds exhibit poor δ TPA in the NIR−I region (700–900 nm) due to the lack of suitable molecular design. Here, two novel star-shaped PDIs fluorophores, namely PDI−S and PDI−Se, were constructed by four periphery S/Se-fused PDIs connected with bicarbazole core. PDI−S manifested excellent δ TPA of 3775 GM, which are among the highest values reported for PDIs excited in the NIR−I region.
研究领域:
有机化学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ANALYST
·
2022
·Vol. 147
·期 12
·2793-2801
·
IF 5.227
Yunchun Liu,Wanru Zhu,Xinru Wei,Lun Wang,Hongqi Chen
In this work, a single particle imaging method based on the total internal reflection (TIR) imaging platform for the sensing and cell imaging of nitrite (NO2−) in the near-infrared region using cyanine dye-assembled composite upconversion nanoparticles (UCNPs) was developed. The NaYF4:Yb,Tm@NaGdF4 UCNPs were synthesized as energy donors, and the cyanine dye IR-798 was prepared as an energy acceptor. Since the absorption spectrum of the cyanine dye IR-798 and the luminescence spectrum of upconversion nanoparticles overlapped effectively, IR-798 quenched the luminescence of the UCNPs. When NO2− was added to the cyanine dye-assembled composite upconversion nanoparticle system, NO2− destroyed the conjugate structure of IR-798, so that the luminous intensity of UCNPs could be restored. Based on the mechanism, a quantitative image analysis with high sensitivity, low sample usage, and fast response time using the TIR single particle imaging platform was developed to determine the content of nitrite in human serum samples. In addition, the UCNPs-IR-798 probe was applied to image the exogenous NO2− content in HeLa living cells based on the single particle imaging platform.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaoyue Hao,Yong Liu,Gaorong Han,Gaoling Zhao,Dongxue Liu,Huitao Dai,Sainan Ma,Likun Wang
Over half of the solar energy comes from the infrared region, which makes electrochromic materials that modulate infrared transmittance essential for the thermal management of smart windows. However, existing electrochromic materials do not perform well in the near-infrared region, which exhibits slow response time, weak adhesion to conductive substrates, and poor long-term cycling stability. In the present work, we successfully synthesized WO 3 @ITO nanorod samples with hierarchical core–shell structure by hydrothermal and in-situ solvothermal methods. ITO-coated WO 3 nanorods and some ITO nanocrystals were firmly integrated with WO 3 nanorods, resulting in a corn-like hybrid heterogeneous structure. The unique WO 3 @ITO hierarchical core–shell structure improves the electronic properties and the adhesion to substrates, reducing the energy barrier of ion diffusion and increasing the ion flux. Enhanced electrochromic performance in NIR range with a high optical modulation of 53.3 % in 1600 nm and long-term reversibility (maintaining 91.5 % of its original contrast after 1000 cycles) was achieved. In addition, response time (t c = 3.5 s, t b = 4.6 s) and coloration efficiency (112.5 cm 2 ‧C -1 ) have been significantly improved, which is almost twice that of unmodified WO 3 nanorods (t b = 8.6 s and CE = 56.4 cm 2 ‧C -1 ), showing a good application prospect in smart windows.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hua Gu,Shouli Ming,Kaiwen Lin,Shuai Chen,Ximei Liu,Baoyang Lu,Jingkun Xu
Isoindigo has been found to be an excellent electron-accepting building block towards electroactive conjugated polymers with remarkable optoelectronic properties for organic electronics due to its ease of scalable synthesis with high yields. Isoindigo-based conjugated polymers have been successfully applied in organic photovoltaics and organic field effect transistors most recently, yet have attracted surprisingly scant attention in polymeric electrochromics despite their potential advantages. Herein, to evaluate the electrochromic performances of isoindigo-based materials, we synthesized two donor–acceptor–donor (D–A–D) type precursors of isoindigo moiety end-capped with 3,4-ethylenedioxythiophene (EDOT), ( E )-6,6′-bis(2,3-dihydrothieno[3,4- b ] [1,4]dioxin-5-yl)-1,1′-dihexyl-[3,3′-biindolinylidene]-2,2′-dione (IDOHE) and ( E )-6,6′-bis(2,3-dihydrothieno[3,4- b ] [1,4]dioxin-5-yl)-1,1′-didodecyl-[3,3′-biindolinylidene]-2,2′-dione (IDODE) by Stille coupling, and electropolymerized them to get the corresponding polymer films. These p and n -dopable low band-gap polymers (∼1.26 eV) revealed electrochromic nature from green color in the neutral state to blue upon oxidation . Further kinetic investigation demonstrated isoindigo-EDOT polymers exhibited outstanding electrochromic performances especially in the NIR region, including high coloration efficiency of 362 cm 2 C −1 at 1050 nm, fast switching time of 0.5 s, and high optical contrast of 59% at 1500 nm, and excellent redox stability (<8% after 4000 cycling). Based on these findings, isoindigo-EDOT polymers possessed competitive electrochromic parameters suffice for device fabrication and commercial applications and can be further explored towards indoor electrochromic products and flexible NIR displays. Overall, isoindigo and its derivatives can be regarded as a series of promising acceptors for synthesizing high-performance D-A type NIR electrochromic polymers.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2017
·
IF 13.858
Xingzhong Zhu,Hang Kuen Yip,Xiaolu Zhuo,Ruibin Jiang,Jianli Chen,Xiao-Ming Zhu,Zhi Yang,Jianfang Wang
The synthesis of metal nanostructures with plasmon wavelengths beyond ∼1000 nm is strongly desired, especially for those with small sizes. Herein we report on a AgPd-tipping process on Au nanobipyramids with the resultant red plasmon shifts reaching up to ∼900 nm. The large red plasmon shifts are ascribed to the deposition of the metal at the tips of Au nanobipyramids, which is verified by electrodynamic simulations. The method has been successfully applied to Au nanobipyramids and nanorods with different longitudinal dipolar plasmon wavelengths, demonstrating that the plasmon wavelengths of these Au nanocrystals can be extended to the entire near-infrared region. Pt can also induce the tipping on Au nanobipyramids and nanorods to realize red plasmon shifts, suggesting the generality of our approach. We have further shown that the metal-tipped Au nanobipyramids possess a high photothermal conversion efficiency and good photothermal therapy performance. This study opens up a route to the construction of Au nanostructures with plasmon resonance in a broad spectral region for plasmon-enabled technological applications.
研究领域:
材料科学
·
纳米技术
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 26
·14434-14444
·
IF 2.936
Yuqing Gu,Yuqing Zhang,Yi Li,Xiulong Jin,Chengjun Huang,Stefan A. Maier,Jian Ye
Surface-enhanced Raman scattering (SERS) nanoprobes show promising potential for biosensing and bioimaging applications due to advantageous features of ultrahigh sensitivity and specificity. However, very limited research has been reported on the SERS photostability of nanoprobes upon continuous laser irradiation, which is critical for high-speed and time-lapse microscopy. The core–shell off-resonant gap-enhanced Raman tags (GERTs) with built-in Raman reporters, excited at near-infrared (NIR) region but with a plasmon resonance at visible region, allow decoupling the plasmon resonance behaviors with the SERS performance and therefore show ultrahigh Raman photostability during continuous laser irradiation. In this work, we have synthesized five types of off-resonant GERTs with different embedded Raman reporters, numbers of shell layer, or nanoparticle shapes. Via thorough examination of time-resolved SERS trajectories and quantitative analysis of photobleaching behaviors, we have demonstrated that double metallic-shell GERTs embedded with 1,4-benzenedithiol molecules show the best photostability performance, to the best of our knowledge, among all SERS nanoprobes reported before, with a photobleaching time constant up to 4.8 × 105 under a laser power density of 4.7 × 105 W cm−2. Numerical calculations additionally support that the local plasmonic heating effect in fact can be greatly minimized using the off-resonance strategy. Moreover, double-shell BDT-GERTs are highly potential for high-speed and high-resolution Raman-based cell bioimaging.
研究领域:
生物传感
·
生物成像
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
CHEMISTRY LETTERS
·
2025
·Vol. 54
·期 2
·
IF 1.1
Cao Yudi,Chen Qingshan,Wang Lei,Yang Mingqing,Zhang Shiyu,Niu Chunhui,Lv Yong
In this study, we develop a simple method for efficiently preparing poly(2,2′-bithiophene) flexible electrochromic devices. The poly(2,2′-bithiophene) films are fabricated in the ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate. The poly(2,2′-bithiophene) films are characterized by Fourier transform infrared spectroscopy, scanning electron microscope, and ultraviolet-visible absorbance spectroscopy. The poly(2,2′-bithiophene) films exhibit electrochromic behavior, transitioning from an orange-red color in its reduced state to a dark green upon oxidation, particularly pronounced in the near-infrared region. Further studies demonstrate that poly(2,2′-bithiophene) films exhibits flexibility, allowing it to be bent and folded. This method for fabricating poly(2,2′-bithiophene) films shows promising potential for future applications.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Liwei Dai,Liping Song,Youju Huang,Lei Zhang,Xuefei Lu,Jiawei Zhang,Tao Chen
Due to the larger surface area and the synergistic effects between two noble metals, the bimetallic superstructures exhibit enhanced distinctive optical, catalytic, and photothermal performances and surface-enhanced Raman scattering (SERS) “hot-spot” effect, and thus have attracted great interest in various applications. Compared with the common Pd, Pt hierarchical structures coated onto Au nanoparticles (NPs), easily synthesized via fast autocatalytic surface growth arising from intrinsic properties of Pd and Pt metals, precisely controlling the hierarchical Ag growth onto Au NPs is rarely reported. In our present study, the reducing agent dopamine dithiocarbamate (DDTC) was covalently capped onto the first metal core (Au) to delicately control the growth model of the second metal (Ag). This results in heterogeneous nucleation and growth of Ag precursor on the surface of Au nanorods (NRs), and further formation of cornlike bimetallic Au/Ag core–shell superstructures, which usually cannot be achieved from traditional epitaxial growth. The thickness of the hierarchical Ag shell was finely tuned in a size range from 8 to 22 nm by simply varying the amount of the ratio between Ag ions and DDTC capped on Au NR core. The tunable Ag shell leads to anisotropic bimetallic Au/Ag core–shell superstructures, displaying two distinctive plasmonic resonances in the near-infrared region (NIR). In particular, the longitudinal surface plasmon resonance exhibits a broadly tunable range from 840 to 1277 nm. Additionally, the rich hot spots from obtained Au/Ag superstructures significantly enhance the SERS performance.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2021
·Vol. 222
·期 12
·2100037
·
IF 2.527
Yan Zhang,Lingqian Kong,Yuchang Du,Jinsheng Zhao,Yu Xie
Thiadiazolobenzotriazole (TBZ)-containing donor-acceptor (D–A) type polymers are rarely investigated as electrochromic materials, although they have made important progress in the fields of organic transistors and solar cells. In this work, a new class of soluble D–A type electrochromic polymer is designed using the alkyl substituted TBZ units as the acceptor, the alkyl substituted 3,4-propylenedioxythiophene (ProDOT) units as the donor, and benzene (B) units as the π -bridge. Through altering the molar ratio of ProDOT/B/TBZ, three polymers named PPBT-1, PPBT-2 and PPBT-3 are chemically synthesized. After various characterizations, it is found that all the polymers display saturated green in their neutral states and switch to transparent gray upon oxidation with narrow optical bandgaps, and moreover, they demonstrate high optical contrast, rapid switching speed, and excellent coloration efficiency particularly in the near infrared region. The impacts of different donor-acceptor feed ratios on electrochromic performances are mainly reflected in the optical, electrochemical and kinetic properties. In contrast to PPBT-1 and PPBT-3, PPBT-2 show the best performances with the most appropriate ProDOT/B/TBZ ratio of 2/3/1 in its backbone. These positive results provide a theoretical basis for the research of electrochromic polymers based on TBZ units.
研究领域:
材料科学
·
有机电子学
✓ 已验证
产品关联
DOI
高影响因子
Nano Research
·
2018
·Vol. 12
·期 2
·449-455
·
IF 7.994
Huang Zhulin,Meng Guowen,Hu Xiaoye,Pan Qijun,Huo Dexian,Zhou Hongjian,Ke Yan,Wu Nianqiang
A facile synthetic approach has been developed to prepare uniform and size-tunable spiky Au@Ag core-shell nanoparticles (NPs) to tailor the localized surface plasmon resonance (LSPR) properties. The gradual assembly of small Au nanocrystals allows the size of spiky Au NPs to be modulated from tens to several hundreds of nanometers by tuning the concentration of initial Au seeds and Au source; and the thickness of the Ag shell can be adjusted with stepwise reduction of Ag(I) ions. The LSPR bands of such spiky Au@Ag core-shell NPs resemble those of pure spiky Au NP cores of similar sizes in near-infrared region, and increasing the Ag shell thickness results in a blue shift and broadening of the LSPR band in the near-infrared region. Additionally, the spiky Au@Ag core-shell NPs exhibit improved surface-enhanced Raman scattering (SERS) activity as compared to the bare spiky Au NPs and spherical Ag@Au NPs. This work has offered a facile route to synthesize plasmonic metal NPs with LSPR band in 650 to 800 nm that show strong enhancement of localized electromagnetic field, which provides an effective SERS substrate for SERS imaging and detection in biological fluids and tissues.
研究领域:
纳米材料科学
·
生物医学检测
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Peiyu Wu,Shengxiong Zhang,Yuzhou Wu,Wenjun Zhang,Weijie Song
Dual-band electrochromic (EC) materials are expected to be utilized as building materials for energy saving, but their cycle stability is still an obstacle. Here, two D–A conjugated polymers, PDPPCz36 and PDPPCz27, based on diketopyrrolopyrrole and carbazole linked with different sites, are synthesized. Both of them exhibit dual-band EC behaviors with a dark blue color in the neutral state and high absorption in the near-infrared (NIR) region when oxidized. However, PDPPCz36 exhibits better cycle stability and a shorter response time than PDPPCz27. In the visible (VIS) region, the PDPPCz36 film exhibits an initial light modulation range (ΔT) of 43.0% and that of the PDPPCz27 film is 41.3%. After 100 cycles of redox, the ΔT of the PDPPCz36 film declines by 32%, while that of PDPPCz27 attenuates by more than 50%. A similar tendency is evident in the NIR region. Moreover, PDPPCz36 shows subsecond colored switch times both in the VIS (0.4 s) and NIR (0.7 s) regions, while those of PDPPCz27 are 2.1 and 1.6 s, respectively. Further research suggests that 3,6-linked carbazoles in PDPPCz36 simultaneously inhibit the side reaction and film aggregation, which leads to better redox stability and shorter response time in both EC tests and devices.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）