ACS Nano
·
2021
·
IF 15.881
Jinglin Shen,Qianwen Xiao,Panpan Sun,Jin Feng,Xia Xin,You Yu,Wei Qi
The self-assembly of chiral metal nanoclusters into supramolecular chiral aggregates is of interest for developing advanced materials. Herein, we manipulated the self-assembly of Au nanoclusters modified by l-/d-cysteine (l-/d-AuNCs) into ordered microstructures featuring enhanced phosphorescence and optical activities. The formation of these aggregates was driven by synergistic effect of coordination and electrostatic interactions assisted by Cd2+/H+. Detailed structural characterization and theoretical studies confirmed that the compact aggregation structures are essential for the emission enhancement and the chirality amplification of l-/d-AuNCs. Interestingly, upon the formation of microflowers, the emission lifetime was prolonged to 3.34 ms with a switch from fluorescence to phosphorescence induced by aurophilic Au(I)···Au(I) interactions and intensive ligand-to-metal charge transfer (LMCT). Moreover, both the CD and photoluminescence (PL) signals of the microflowers exhibited pH-responsiveness. This dual-mode sensitive platform could be developed as a pH sensor with improved accuracy. Additionally, the pH-responsive photoluminescence ON/OFF switch of the microflowers could be employed for reliable information encryption and decryption. This study provides useful ideas for regulating the self-assembly of nanoclusters to generate desired photophysical properties with potential applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Lin Fan,Pengfei Wang,Mingyue Wang,Wanhong Lü,Fengyou Wang,Huilian Liu,Jinghai Yang,Lili Yang
In the development of high-efficiency n-i-p planar heterojunction perovskite solar cells (PSCs), the development of dense electron-transporting layers (ETLs) with excellent electrical properties and hetero-interface quality is very important for promoting perovskite growth and carrier transport dynamics. Herein, we propose a simple and effective strategy to simultaneously improve the electronic properties and interface quality of a tin oxide (SnO 2 ) ETL by introducing 2-hydroxyethyl modified gold nanostars (HEPES-Au NSs) into a commercial SnO 2 colloidal dispersion in order to synthesize mixed ETLs at low temperatures (≤150 ℃). Based on the unique plasmonic structure of the HEPES-Au NSs, we demonstrate that the modified ETLs exhibit higher conductivity and greater efficiency in the extraction, transfer, and collection of photogenerated electrons than conventional SnO 2 ETLs. Moreover, the chemical bond interaction between HEPES-Au NSs and the perovskite enhances the affinity of the SnO 2 /perovskite hetero-interface, which effectively improves the nucleation and crystallization kinetics of the perovskite, thus producing a high-quality absorber with high crystallinity and superior absorbance. Meanwhile, the 2-hydroxyethyl (HEPES) adsorbed onto the SnO 2 surface effectively passivates perovskite-related trap states, suppressing the non-radiative recombination and leakage current, and ultimately improving the relative electronic properties and photovoltaic performance output of the modified device. The results show that the power conversion efficiency (PCE) of the modified PSCs is significantly better than that of the original SnO 2 -based planar devices, and the optimal PCE reached 21.13%, with negligible hysteresis. Additionally, owing to the multifunctional effects of SnO 2 modified by HEPES-Au NSs, the functionalized devices without encapsulation also demonstrate reliable reproducibility and good stability, which shows great advantages in the development of high-efficiency flexible PSCs and monolithic tandem devices.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 8
·1-9
·
IF 5.833
Leng Yumin,Cheng Jinbing,Liu Congbin,Wang Dong,Lu Zhiwen,Ma Chunhua,Zhang Mengyang,Dong Yuchen,Xing Xiaojing,Yao Lunguang,Chen Zhengbo
A gold nanoparticle (AuNP)–based sensing strategy based on rapid reduction of Au(I→0) is proposed. As a proof-of-concept study, the proposed sensing principle is designed for simultaneous and colorimetric detection and discrimination of multiple proteins. In the presence of H 2 O 2 , the target proteins could reduce Au(I) (i.e. HAuCl 2 ) to AuNPs with different sizes, shapes and dispersion/aggregation states, thus resulting in rapidly colorimetric identification of different proteins. The optical response (i.e. color) of AuNPs is found to be characteristic of a given protein. The color response patterns are characteristic for each protein and can be quantitatively differentiated by statistical techniques. The sensor array is capable of discriminating proteins at concentrations as low as 0.1 μg/mL with high accuracy. A linear relationship was observed between the total Euclidean distances and protein concentration, providing the potential for protein quantification using this sensor array. The limit of detection (LOD) for catalase (Cat) is 0.08 μg/mL. The good linear range (from 0 to 8 μg/mL) has been used for the quantitative assay of Cat. To show a potentially practical application, this method was used to detect and discriminate proteins in human urine and tear samples.
We report a facile gold nanoparticle (AuNP)-based sensing strategy, that is, "a rapid reduction of Au(I) to Au(0) nanoparticles with different sizes and shapes by analytes that having certain reducing capabilities, resulting in different colours." The proposed sensing principle is designed for simultaneous, colorimetric detection and discrimination of multiple proteins.
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高影响因子
DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 31
·10838-10844
·
IF 4.39
Xia Xu,Meirong Fu,Penghui Li,Min Yang
While photothermal therapy is widely applied in phototherapy, there are still challenges in developing new generation phototherapy materials with precise diagnostic functions. Here we report the construction of a pH responsive upconversion fluorescence imaging precisely guided photothermal therapy system, namely NaYF4:Yb3+/Er3+@NaYF4@MnO2@Au nanocomposites, which can effectively avoid light damage to non-target tissues. Owing to the fluorescence resonance energy transfer between the upconversion nanocrystal donor and MnO2 and Au acceptor, the upconversion fluorescence is completely quenched. However, in pH 5.3 PBS buffer, MnO2 is gradually broken down, and the upconversion fluorescence is partially recovered, which could be used for upconversion fluorescence imaging to precisely guide photothermal therapy under 980 nm excitation. Simultaneously, due to the absorption of 980 nm excitation light and the emission bands of Er3+ (2H11/2 → 4I15/2 and 4S3/2 → 4I15/2 transition), temperature increment of core@shell@MnO2@Au could reach 35.5 °C under 980 nm excitation at 0.8 W cm−2. The core@shell@MnO2@Au nanocomposites are supposed to contribute significantly in the biological applications of photoluminescence imaging and photothermal therapy.
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高影响因子
FOOD CONTROL
·
2021
·
IF 5.548
Yinyin Chen,Xini Wang,Changfang Lu,Wei Wu,Xianxiang Wang
Doxycycline (DOX) is widely used as feed additive and may remain in animal food . Thus, the detection of DOX in food field has become important. This work has reported a simple and rapid strategy to detect DOX by ratiometric fluorescence method without any sensitization materials based on bovine serum albumin (BSA) protected Au nanoclusters (BSA-Au NCs). Under excitation at 390 nm, the BSA-Au NCs has displayed two distinct emission peaks at 510 nm and 640 nm which are respectively originated from BSA and Au NCs, respectively. The fluorescence intensity ratio of I 510 / I 640 of BSA-Au NCs probe has presented a good linear range (0.1–30 μM) and 0.006 μM limit of detection for DOX. This method was used successfully to detect DOX in food samples and the good recoveries reached 96.7–103.7%. The research has showed that potential application of BSA-Au NCs in food field because of its convenient synthesis scheme and excellent selectivity and sensitivity.
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APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Xiao-Hong Wen,Xue-Feng Zhao,Bo-Fang Peng,Kai-Ping Yuan,Xiao-Xi Li,Li-Yuan Zhu,Hong-Liang Lu
The increase of homocysteine (Hcy) is closely related with the development of many diseases. Nevertheless, the effective detection of Hcy remains challenging due to the lack of a simple, specific, and cost-efficient method. Herein, an electrochemical biosensor based on Hcy aptamer/Au nano-particles/graphene sponge (Aptamer/Au NPs/GS) was designed for the detection of homocysteine. The biosensor employed methylene blue (MB) as a redox indicator. Due to the change of aptamer conformation, the adsorbed MB was released from aptamer, resulting in the decrease of electrochemical response. In the range of 1–100 μM, the concentration of Hcy had a good linear relationship with the relative redox peak current (Δ I ) of MB and the lowest detection limit was 1 μM. The experimental results demonstrated the aptasensor had good selectivity and reproducibility. In real serum sample, the aptasensor showed an acceptable recovery rate indicating its potential applications in the preliminary detection of various diseases associated with Hcy.
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Nanomaterials
·
2021
·Vol. 11
·期 1
·233
·
IF 5.076
Ying Li,Tie Liu,Shuang Feng,Wenshu Yang,Ying Zhu,Yingying Zhao,Zhiyan Liu,Haibin Yang,Wuyou Fu
Herein, a novel actinomorphic flower-like ZnO/Au/CdS nanorods ternary composite photocatalyst is prepared to extend the light-responsive range, reduce the photogenerated charge carriers recombination, and ultimately improve the water splitting performance. Flower-like ZnO nanorods are synthesized by a chemical bath method and the CdS nanoparticles are sensitized by successive ionic layer adsorption and reaction method. Then the Au nanoparticles as co-catalysts are introduced by the photodeposition method to modify the interface of ZnO/CdS for reducing the photogenerated electron recombination rate and further improving the performance of water splitting. Detailed characterizations and measurements are employed to analyse the crystallinity, morphology, composition, and optical properties of the flower-like ZnO/Au/CdS nanorods samples. As a result, the flower-like ZnO/Au/CdS nanorod samples present significantly enhanced water splitting performance with a high gas evolution rate of 502.2 μmol/g/h, which is about 22.5 and 1.5 times higher than that of the pure ZnO sample and ZnO/CdS sample. The results demonstrate that the flower-like ZnO/Au/CdS nanorods ternary composite materials have great application potential in photocatalytic water splitting for the hydrogen evolution field.Keywords:flower-like ZnO nanorods;Au;CdS;photocatalytic water splitting
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高影响因子
ANALYTICA CHIMICA ACTA
·
2021
·
IF 6.558
Fangya Mu,Junqing He,Fang Fan,Guoyue Shi
Precise doses of antibiotics are necessary to prevent bacterial drug resistance . Although fluorescent sensors are promising for quantitative analyses of antibiotics, improvements in feasibility, selectivity , and sensitivity are needed. In this study, a dual-emission fluorescence biosensor platform was developed for simple, selective, and sensitive determination of vancomycin (Van) based on a peptide conjugated with blue-emitting aggregation-induced emission luminogens (AIEgen) and aptamer-modified red-emitting gold nanoclusters (AuNCs-apt). The peptide and aptamer together recognized Van with high affinity, thus changing the fluorescence intensity at 470 nm and 650 nm, respectively. This platform displayed excellent linear correlation between the fluorescence response and a Van concentration ranging 0.01–100 μg mL −1 , and the limit of detection (LOD) was 2.79 ng mL −1 . In addition to the ability to accurately distinguish Van from glycopeptide antibiotics , the newly developed biosensor allowed for naked-eye detection of 1 μg mL −1 Van. These results and those of serum samples and microdialysate samples support the application of this newly developed method for Van monitoring and clinical diagnosis.
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高影响因子
Journal of Physical Chemistry C
·
2020
·
IF 4.189
Lina Lin,Xiaoyu Feng,Dengpeng Lan,Yuang Chen,Qilan Zhong,Chao Liu,Yan Cheng,Ruijuan Qi,Jianping Ge,Chengzhong Yu,Chun-gang Duan,Rong Huang
Interface structure plays an extremely important role in the charge-transfer and photocatalytic performances in plasmonic metal/semiconductor systems. Defect engineering by introducing an oxygen vacancy (Ovac) is an effective way to modulate the interface structure. Here, a representative photocatalyst system including TiO2, TiO2–x, Au-TiO2 and Au-TiO2–x as designed delicately to reveal the detailed mechanism of the plasmon-resonance-induced charge separation in interfacial defect structure from the nanoscale. The local charge transfer via a conducting amorphous-like interface layer is visualized as the arched valence change from Ti3+ to Ti4+ at the Au-TiO2–x interface after Schottky contact. This phenomenon eventually leads to the enhancement of localized surface plasmon resonance (LSPR) at 2.3 eV, and the introduction of Ovac reduces the Schottky barrier height of Au-TiO2–x by 5 mV compared with that of Au-TiO2. Under visible light, Au-TiO2–x excites the most photogenerated carriers to the surface, which is larger than that of TiO2–x and Au-TiO2. It can be concluded that the changes in electronic structure eventually promote charge transfer in visible light and explain the original reason that the coupling of Ovac and Au could improve the photocatalytic performance.
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Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
Xing Chen,Xu-Xu Ke,Yao Liu,Rohan Weerasooriya,Heng Li,Yu-Cheng Wu
Chromium readily undergoes redox speciation, and Cr(VI) oxidation state is ubiquitous and mobile in the environment. Under physiological conditions, Cr(VI) reduction yields species as Cr(V) or Cr(VI), which shows reactivity towards DNA damaging. Therefore, accurate detection of Cr species in the environmental compartment is of utmost importance. In compliance with green chemistry, Au/mpg-C 3 N 4 nanocomposites were successfully fabricated by ultra-violet photo-reduction without a reducing agent. The Au/mpg-C 3 N 4 nanocomposites were characterized by scanning electron microscope (SEM), X-ray diffractometry (XRD), X-ray photoelectron spectrometry (XPS), and infrared spectrophotometry. Well-dispersed gold nanoparticles with an average diameter of 50 nm decorated on mpg-C 3 N 4 . We developed a method to determine Cr(VI) with excellent sensitivity (0.002196 μA/ppb) and detection limit (14.7 ppb) using Au/mpg-C 3 N 4 modified glassy carbon working electrode by linear sweep voltammetry (LSV). The same electrode can use in real-time Cr(VI) monitoring using amperometry. The new sensor is stable and free from interferences from other species in natural water, and it can also be used in real-time Cr(VI) monitoring over wide concentration ranges.
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高影响因子
Tungsten
·
2020
·Vol. 2
·期 2
·194-202
·
IF 0
Yu Xue-Ping,Yang Chan,Song Pin,Peng Juan
Ultra-small MoS 2 quantum dots (QDs) with an average size of 2.48 nm coated on Au nanoparticles with a core-satellite structure (Au/MoS 2 QDs) are successfully prepared by a self-assembly strategy through the strong bonding between Au and S. Benefited from the unique structure, the Au/MoS 2 QDs hybrid exhibits outstanding electrocatalytic performance toward hydrogen evolution reaction (HER). The Au/MoS 2 QDs hybrid needs overpotentials of 112, 146, and 206 mV to approach current densities of 10, 20, and 50 mA·cm −2 in 0.5 mol·L −1 H 2 SO 4 (pH = 0.3), respectively. And a low Tafel slope (83 mV·dec −1 ) is obtained. The catalyst also displays satisfactory stability and durability, indicating a negligible current density loss after 20 h of electrolysis. The high hydrogen generation activities and stability are attributed to the great number of active sites, high conductivity and synergistic effects between gold nanoparticles (Au NPs) and MoS 2 QDs. Last but not least, this strategy opens up a favorable way to combine MoS 2 QDs with other metals.
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JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2020
·
IF 3.807
An-ran Zhang,Hui Zhong,Xiao-rong Li,Zhuan-li Bao,Zhi-peng Cheng,Yu-jie Zhang,Ping Chen,Zai-chao Zhang,Li-li Zhang,Hai-yan Qian
An electrochemiluminescence (ECL) sensor was developed with carboxylated graphene-loaded Au@Ag core-shell nanoparticles . Scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDS), transmission electron microscope (TEM) and inductive coupling plasma (ICP) were applied to characterizing COOH-G/Au@Ag nanocomposites . Electrochemical performance of the nanocomposites was evaluated by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Based on ECL experimental results, we can find COOH-G/@Au@Ag nanocomposites have good electrocatalytic ability for glucose, so we construct a glucose electrochemiluminescence (ECL) sensor. When the glucose concentration range is from 0.005 to 1500 μM, the linear response of ECL intensity to glucose concentration was valid with detection limit of 0.02 μM. In addition, the developed sensor not only has good stability, repeatability and sensitivity for the detection of glucose, but also can be successfully used for glucose monitoring in human serum samples.
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