共查询到8条相似文献,搜索用时 15 毫秒
1.
Zaizhu Lou Peng Zhang Juan Li Xianguang Yang Baibiao Huang Baojun Li 《Advanced functional materials》2019,29(11)
Nonmetallic plasmonic heterostructure TiO2‐mesocrystals/WO3?x‐nanowires (TiO2‐MCs/WO3?x‐NWs) are constructed by coupling mesoporous crystal TiO2 and plasmonic WO3?x through a solvothermal procedure. The continuous photoelectron injection from TiO2 stabilizes the free carrier density and leads to strong surface plasmon resonance (SPR) of WO3?x, resulting in strong light absorption in the visible and near‐infrared region. Photocatalytic hydrogen generation of TiO2‐MCs/WO3?x‐NWs is attributed to plasmonic hot electrons excited on WO3?x‐NWs under visible light irradiation. However, utilization of injected photoelectrons on WO3?x‐NWs has low efficiency for hydrogen generation and a co‐catalyst (Pt) is necessary. TiO2‐MCs/WO3?x‐NWs are used as co‐catalyst free plasmonic photocatalysts for CO2 reduction, which exhibit much higher activity (16.3 µmol g?1 h?1) and selectivity (83%) than TiO2‐MCs (3.5 µmol g?1 h?1, 42%) and WO3?x‐NWs (8.0 µmol g?1 h?1, 64%) for methane generation under UV–vis light irradiation. A photoluminescence study demonstrates the photoelectron injection from TiO2 to WO3?x, and the nonmetallic SPR of WO3?x plays a great role in the highly selective methane generation during CO2 photoreduction. 相似文献
2.
Zhengfeng Zhu Yousheng Zou Weida Hu Yuebin Li Yu Gu Bingqiang Cao Nan Guo Lin Wang Jizhong Song Shengli Zhang Haoshuang Gu Haibo Zeng 《Advanced functional materials》2016,26(11):1793-1802
Localized surface plasmon resonance (LSPR) has many applications which require meeting specific wavelength windows. The most prominent examples are photothermal therapy in biology, matched to the biological window (650–1350 nm), and communication relying on photodetection in optoelectronics, matched to the communication window (1260–1675 nm). However, for the classic noble metals (Au, Ag), tuning LSPRs from visible region to these two windows is still a demanding task due to their intrinsic limitations on charge density and dielectric function. Here, the discovery of near‐infrared biological and communication window‐matched plasmonic properties of semimetal TiS2 nanosheets (NSs) is reported for the first time. Developed synthesis procedures allow fine‐tuning width and thickness of single‐crystal TiS2 NSs. During characterization a new and intensive absorption peak in the 1000–1400 nm range is observed from both TiS2 NS colloid solutions and films. This peak is attributed to LSPR due to its dependence on particle shape and on the refractive index of solvents. The superiority of such LSPRs is demonstrated in both, biological and optical applications: excitation at 808 and 980 nm generates a ≈50 °C photothermal temperature rise, while excitation at 1310 nm results in two‐times enhanced photocurrents of PbS photodetectors compared to untreated devices. 相似文献
3.
Plasmonic Au/TiO2‐Dumbbell‐On‐Film Nanocavities for High‐Efficiency Hot‐Carrier Generation and Extraction
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Kwun Hei Willis Ho Aixue Shang Fenghua Shi Tsz Wing Lo Pui Hong Yeung Yat Sing Yu Xuming Zhang Kwok‐yin Wong Dang Yuan Lei 《Advanced functional materials》2018,28(34)
Plasmon‐induced hot carriers have vast potential for light‐triggered high‐efficiency carrier generation and extraction, which can overcome the optical band gap limit of conventional semiconductor‐based optoelectronic devices. Here, it is demonstrated that Au/TiO2 dumbbell nanostructures assembled on a thin Au film serve as an efficient optical absorber and a hot‐carrier generator in the visible region. Upon excitation of localized surface plasmons in such coupled particle‐on‐film nanocavities, the energetic conduction electrons in Au can be injected over the Au/TiO2 Schottky barrier and migrated to TiO2, participating in the chemical reaction occurring at the TiO2 surface. Compared with the same dumbbell nanostructures on an indium tin oxide (ITO) film, such nanocavities exhibit remarkable enhancement in both photocurrent amplitude and reaction rate that arise from increased light absorption and near‐field amplification in the presence of the Au film. The incident‐wavelength‐dependent photocurrent and reaction rate measurements jointly reveal that Au‐film‐mediated near‐field localization facilitates more efficient electron–hole separation and transport in the dumbbells and also promotes strong d‐band optical transitions in the Au film for generation of extra hot electrons. Such nanocavities provide a new plasmonic platform for effective photoexcitation and extraction of hot carriers and also better understanding of their fundamental science and technological implications in solar energy harvesting. 相似文献
4.
Homan Kang Sinyoung Jeong Younggeun Park Joonhyuk Yim Bong‐Hyun Jun San Kyeong Jin‐Kyoung Yang Gunsung Kim SoonGweon Hong Luke P. Lee Jong‐Ho Kim Ho‐Young Lee Dae Hong Jeong Yoon‐Sik Lee 《Advanced functional materials》2013,23(30):3719-3727
For the effective application of surface‐enhanced Raman scattering (SERS) nanoprobes for in vivo targeting, the tissue transparency of the probe signals should be as high as it can be in order to increase detection sensitivity and signal reproducibility. Here, near‐infrared (NIR)‐sensitive SERS nanoprobes (NIR SERS dots) are demonstrated for in vivo multiplex detection. The NIR SERS dots consist of plasmonic Au/Ag hollow‐shell (HS) assemblies on the surface of silica nanospheres and simple aromatic Raman labels. The diameter of the HS interior is adjusted from 3 to 11 nm by varying the amount of Au3+ added, which results in a red‐shift of the plasmonic extinction of the Au/Ag nanoparticles toward the NIR (700–900 nm). The red‐shifted plasmonic extinction of NIR SERS dots causes enhanced SERS signals in the NIR optical window where endogenous tissue absorption coefficients are more than two orders of magnitude lower than those for ultraviolet and visible light. The signals from NIR SERS dots are detectable from 8‐mm deep in animal tissues. Three kinds of NIR SERS dots, which are injected into live animal tissues, produce strong SERS signals from deep tissues without spectral overlap, demonstrating their potential for in vivo multiplex detection of specific target molecules. 相似文献
5.
Hot Carriers: Plasmonic Au/TiO2‐Dumbbell‐On‐Film Nanocavities for High‐Efficiency Hot‐Carrier Generation and Extraction (Adv. Funct. Mater. 34/2018)
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Kwun Hei Willis Ho Aixue Shang Fenghua Shi Tsz Wing Lo Pui Hong Yeung Yat Sing Yu Xuming Zhang Kwok‐yin Wong Dang Yuan Lei 《Advanced functional materials》2018,28(34)
6.
Synthesis of Dumbbell‐Like Gold–Metal Sulfide Core–Shell Nanorods with Largely Enhanced Transverse Plasmon Resonance in Visible Region and Efficiently Improved Photocatalytic Activity
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Liang Ma Shan Liang Xiao‐Li Liu Da‐Jie Yang Li Zhou Qu‐Quan Wang 《Advanced functional materials》2015,25(6):898-904
The metallic nanostructures with unique properties of tunable plasmon resonance and large field enhancement have been cooperated with semiconductor to construct hetero‐nanostructures for various applications. Herein, a general and facile approach to synthesize uniform dumbbell‐like gold–sulfide core–shell hetero‐nanostructures is reported. The transformation from Au nanorods (NRs) to dumbbell‐like Au NRs and coating of metal sulfide shells (including Bi2S3, CdS, CuxS, and ZnS) are achieved in a one‐pot reaction. Due to the reshaping of Au core and the deposition of sulfide shell, the plasmon resonances of Au NRs are highly enhanced, especially the about 2 times enhancement for the visible transverse plasmon resonance compared with the initial Au NRs. Owing to the highly enhanced visible light absorption and strong local electric field, we find the photocatalytic activity of dumbbell‐like Au–Bi2S3 NRs is largely enhanced compared with pure Bi2S3 and normal Au–Bi2S3 NRs by testing the photodegradation rate of Rhodamine B (RhB). Moreover, the second‐layer sulfide can be coated and the double‐shell Au–Bi2S3–CdS hetero‐nanostructures show further improved photodegradation rate, especially about 2 times than that of Degussa P25 TiO2 (P25) ascribing to the optimum band arrangement and then the prolonged lifetime of photo‐generated carriers. 相似文献
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Photocatalysis: Harvesting Lost Photons: Plasmon and Upconversion Enhanced Broadband Photocatalytic Activity in Core@Shell Microspheres Based on Lanthanide‐Doped NaYF4, TiO2, and Au (Adv. Funct. Mater. 20/2015)
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Zhenhe Xu Marta Quintanilla Fiorenzo Vetrone Alexander O. Govorov Mohamed Chaker Dongling Ma 《Advanced functional materials》2015,25(20):2941-2941