Biomedical Optics Express
·
2021
·Vol. 12
·期 12
·7673-7688
·
IF 3.732
Ning Chen,Yanbing Yuan,Ping Lu,Luyao Wang,Xuedian Zhang,Xuedian Zhang,Hui Chen,Pei Ma
Carbamazepine (CBZ) is a commonly used drug for the treatment of
epilepsy. Due to the narrow effective range, CBZ concentration was
usually monitored with blood draw from patients. Frequent blood draw
is inconvenient and causes physical and psychological pain. Therefore,
highly-sensitive, rapid, label-free, and non-invasive drug detection
methods can be alternatives to bring a relief. In this work, we have
proposed a method for the non-invasive detection of CBZ using
surface-enhanced Raman spectroscopy (SERS). Gold-silver core-shell
nanomaterial substrates were prepared and optimized. Salivary CBZ
concentration was measured with SERS as a non-invasive alternative to
blood draw. The results showed that there was a linear relationship
between SERS response and CBZ concentration in the entire measured
range of 10−1 ∼ 10−8 mol/L.
The detection limit of this method was 1.26 ×
10−9 mol/L. Satisfactory repeatability and stability
were also demonstrated. Due to its high sensitivity and ease of
operation, the proposed method can serve as an alternative to blood
draw for non-invasively monitoring CBZ concentration. It also has
great potentials in many other applications of biomedical
sciences.© 2021 Optical Society of America under the
terms of the OSA Open
Access Publishing Agreement
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CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Yichao Wang,Zipeng Xing,Huanan Zhao,Sijia Song,Meijie Liu,Zhenzi Li,Wei Zhou
Oxygen-doped MoS 2 @In 2 S 3 /Bi 2 S 3 core-shell dual Z-scheme tandem heterojunctions are fabricated via two-step hydrothermal methods. In 2 S 3 and Bi 2 S 3 nanosheets grow on the outer surface of oxygen-doped MoS 2 spheres, and the tight interface between the spheres could ensure stable electron transfer. MoS 2 with oxygen defects could inhibit the recombination of photo-induced electron-hole pairs. The unique core-shell structure increases the interface area and provides adequate surface reactive sites for the reactants. The resultant MoS 2 @In 2 S 3 /Bi 2 S 3 shows broad-spectrum response and excellent photothermal effect, which is beneficial to trigger the near-field temperature rise and promote the photocatalytic process. The MoS 2 @In 2 S 3 /Bi 2 S 3 exhibits excellent photocatalytic H 2 evolution rate of 973.42 μmol h −1 g −1 , and the degradation efficiency of tetracycline within 90 min is 99.6%, which is ∼ 10 times higher than that of pristine MoS 2 . It can be ascribed to the unique core-shell dual Z-scheme tandem heterojunction structure facilitates the transfer and spatial separation of photogenerated electron-hole pairs, and greatly prolongs the carrier lifetime. In addition, the long-term stability indicates the potential applications due to the core-shell dual Z-scheme tandem structure inhibiting the photocorrosion of sulfides.
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RSC Advances
·
2021
·Vol. 11
·期 52
·33036-33047
·
IF 3.361
Ying Li,Fei Lu,Qing-zhi Li,Yi-hua Zhou,Jun Qian,Sheng Cao,Chen-yu Wang
Copper ion (Cu2+) plays an important role in the human body because it is beneficial for metabolism. However, an excessive or slight amount of Cu2+ can cause various symptoms. Therefore, it is necessary for human health to realize the trace and visual detection of Cu2+. Referring to traditional fluorescence test papers, the qualitative and semi-quantitative detection of Cu2+ could be realized by a dual-carbon dots (CDs) ratiometric fluorescent paper-based sensor with the advantages of environmental protection, portability and low cost. In this paper, the inkjet-printed test paper with the best mixing ratio of the two CDs has been researched to maximize the spectral energy transfer of ion detection (maximum color gamut expansion). Among them, the preparation method of b-CDs has been improved, increasing the photoluminescence quantum yield (PLQY) to 88.9%. The sensitivity detection limit of the double emission ratio sensor was 0.15 nM in solution, and the human eye can distinguish at least 3 μmol L−1 Cu2+ in the paper-based sensor. Compared with the traditional single-emission sensor, the human eye was more sensitive to the color change of the emission ratio sensor. The results indicate that we not only realized the micro detection of Cu2+ with convenient methods, but also provided a promising strategy for the visual detection of Cu2+.
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APPLIED CLAY SCIENCE
·
2021
·
IF 5.467
Junming Zhou,Hongmei Liu,Dong Liu,Peng Yuan,Hongling Bu,Peixin Du,Wenxiao Fan,Mengyuan Li
Weathered crust elution-deposited rare earth (WED-RE) ores are important rare earth element (REE) resources around the world. In these ores, the REE are believed to mainly exist as exchangeable REE(III) ions on the surfaces of clay minerals, such as tubular halloysite and platy kaolinite . However, the mechanisms underlying the sorption and desorption of REE(III) ions on clay minerals in the environment of weathered crusts remain ambiguous. In this study, the sorption/desorption characteristics of Eu(III) ions onto halloysite and kaolinite were investigated. The results revealed that Eu(III) was adsorbed onto both clay minerals through inner-sphere complexation and outer-sphere complexation, where the former was the primary sorption mechanism. Halloysite displayed a higher sorption capacity for Eu(III) than kaolinite in a weakly acidic environment (pH 4–6). The desorption efficiency increased with the increasing concentration of NH 4 + ions. When the NH 4 + concentration was 0.002 mol/L, which is similar to the typical cation concentration of groundwater/rainwater, the amount and rate of Eu(III) desorption from halloysite were lower than those from kaolinite. The desorption of Eu(III) ions from the two clay minerals is proposed to be governed by the attraction between the outer-sphere complexes and clay minerals when the NH 4 + concentration is 0.002 mol/L. Therefore, halloysite has a higher sorption capacity and stronger retention capacity for Eu(III) than kaolinite, which suggests that halloysite may play a greater role in REE(III) enrichment in WED-RE ores than kaolinite owing to the similar chemical properties of REE(III) ions. The fundamental results obtained in this study afford new insights into the migration of REE and the role of clay minerals in REE enrichment during ore formation.
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Sustainable Energy & Fuels
·
2021
·Vol. 6
·期 3
·693-699
·
IF 6.367
Chao Chang,Xiaoyu He,Zhaoyang Han,Lilin Pei,Zongyu Wang,Yulong Ji
Developing energy harvesting and conversion technology is of great significance to mitigate the energy crisis and realize the sustainable development of human society. In this work, we designed and fabricated a thermal energy harvesting and conversion device by integrating a tube-based triboelectric nanogenerator (TENG) into a copper oscillating heat pipe (OHP). The tube-based TENG was composed of two copper electrodes uniformly distributed along a polytetrafluoroethylene (PTFE) tube. The copper OHP with an inner diameter of 2 mm had 6 turns and deionized water (DI) was chosen as the working fluid. When thermal energy was added to the OHP, liquid plugs in the OHP were thermally excited and flowed into the PTFE tube, resulting in the generation of an alternating flow of electrons between the two electrodes. This TENG-OHP system successfully generated more than 7.0 V of open-circuit voltage and more than 0.32 μW of output power. The generated electrical energy can be used to power many small electronics, such as capacitors and light-emitting diodes (LEDs). Therefore, these findings will offer an alternative approach to harvest and convert thermal energy heat in many devices or systems that involve the heat generation and heat transfer process.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Mengwei Guo,Zhuoming Wei,Qibo Zhang
The rational design and synthesis of highly efficient, precious metal-free electrocatalysts in the promotion of electrochemical water oxidation is essential for the sustainable use of renewable energy. Herein, an integrated, S-doped MnO x /Mn film developed on carbon paper (CP) formed by a two-step transformation approach that includes template-free electrodeposition and in-situ electrochemical oxidation is employed as an efficient oxygen evolution reaction (OER) electrocatalyst. The doping of S and in-situ electro-oxidation lead to a tailored electronic structure and phase composition , which endow the composite electrode with a significantly enhanced OER catalytic performance. This S-doped integrated electrode perfectly combines highly active MnO x outer layers with conductive metallic Mn inner layers to offer abundant catalytic interfaces and electronic paths, leading to favorable reaction kinetics. As a result, the optimal S-doped MnO x /Mn/CP offers a low overpotential of 435 mV at 10 mA cm −2 with a Tafel slope of 89.97 mV dec −1 as well as improved stability. Impressively, a highly intrinsic catalytic activity with a turnover frequency of 0.0112 s −1 is obtained for S-doped MnO x /Mn/CP, which is 4.2-fold higher than that of MnO x /Mn/CP. S doping plays a critical role in stabilizing the Mn III O x active phase and is ultimately responsible for the enhanced catalytic performance. This work provides an integrated design concept and S doping approach suitable for boosting the OER catalytic performance of MnO x .
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MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Bing Bai,Linlin Qiu,Deqiang Mei,Zhengfei Jin,Lixin Song,Pingfan Du
The use of a support may overcome the limitations of nano-photocatalysts (poor recyclability, secondary pollution, and agglomeration that decreases photocatalytic activity); however, supports such as fibers, fabrics, films, and foams, still exhibit many defects (low loadings, non-uniform particle loadings, and insufficient loading firmness). In this study, we fabricated TiO 2 /porous carbon fiber cloth through a microwave hydrothermal method and thermal reduction. The highly porous structure of fiber could provide abundant space to firmly-supported TiO 2 nanoparticles. Therefore, the results showed that large amounts of TiO 2 were uniformly and firmly loaded onto the porous carbon fiber cloth, and the obtained composite exhibited excellent photocatalytic activity. The initial loading rate reached 51 wt.%. Even after 10 photocatalytic cycles, the pollutant degradation rate exceeded 95%, and 55% of TiO 2 was retained, showing its stability. This investigation provides a method to prepare supported photocatalysis, which can greatly promote their practical applications for wastewater treatment.
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CHEMICAL PHYSICS LETTERS
·
2021
·
IF 2.328
Jingbo Ni,Ruyi Liu,Changhao Yan
Poly(styrene-acrolein) (P(St-AL)) spheres were first prepared through the copolymerization of styrene and acrolein , and then P(St-AL)/reduced graphene oxide (r-GO) nanocomposites were constructed via in-situ reduction of graphite oxide (GO) in the presence of sodium borohydride. Morphologies and physicochemical properties were characterized by TEM, Raman, XRD, XPS and Insulation resistance tester. The results showed the optimal r-GO volume fraction for synthesis and anticorrosion properties of nanocomposites was 0.98 vol%. The electrochemical tests in artificial seawater further revealed that P(St-AL)/r-GO nanocomposites could efficiently improve the anticorrosion performance of the waterborne acrylic resin coating due to the high conductivity and excellent physical barrier.
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MACROMOLECULES
·
2021
·
IF 5.985
Yongsheng Luo,Chu Wang,Ai-Ping Pang,Xiang Zhang,Dayang Wang,Xiaolin Lu
The interfacial molecular structures of polyelectrolyte brushes grafted on solid substrates are generally influenced by the electrostatic interaction and osmotic pressure. Although the hydrated structures of the strong polyelectrolyte brushes are considered less sensitive to salts present in the surrounding environment at low concentrations, the salts may still influence the distribution of polyelectrolyte counterions and interfacial network structures of water molecules nearby, thereby being correlated to the dissociation of the polyelectrolyte chain segments bound on solid substrates and the entire chain conformation. In this study, sum-frequency generation (SFG) vibrational spectroscopy and coarse-grained molecular dynamics (MD) simulation are combined to investigate the interfacial molecular structures of a strong polyelectrolyte, polystyrene sulfonate (PSS), grafted on silica substrates. The dynamic responses of the OH stretching signals of the interfacial water for the PSS brushes in low-concentration salt solutions bearing monovalent (Na+ and K+), divalent (Ca2+), and trivalent (Y3+) cations are monitored via a connected SFG/microfluidic chip system. First, the salts enhanced the ordering of interfacial water structures irrespective of the nature of cations, reflecting the enlarged electric potential owing to the diffusion of ions and the dissociation of the PSS segments near the solid substrate. Second, the dynamics to reach the final interfacial structural equilibrium appears to be dependent on the type of cations, showing a two-step process and thus presenting evidence for the initial ion diffusion and subsequent dissociation of the chain segments near the substrate wall. Meanwhile, it was found that divalent and trivalent cations caused electrostatic bridging among the polyelectrolyte brush segments, leading to a more disordered chain conformation. We therefore believe that this report provides a fundamental understanding of the interfacial structural and structural transition features with respect to the polyelectrolyte brushes at the molecular level.
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DALTON TRANSACTIONS
·
2021
·Vol. 50
·期 25
·8917-8926
·
IF 4.39
Xingyu Chen,Yifu Zhang,Chen Wang,Xueying Dong,Changgong Meng
The design and preparation of electrode materials with excellent performance is particularly important due to the current global scarcity of energy supplies, especially those using sustainable and renewable materials. In this work, it is first proposed to apply iron silicate (FeSi), which is synthesized using environmentally friendly biomass as a raw material, as an electrode material for supercapacitors (SCs). FeSi is derived from the calcination of reed leaves (RLs) in combination with a hydrothermal method, and spherical FeSi retains the porosity of the RL precursors and shows remarkable electrochemical performance. The specific capacitance of FeSi as a SC electrode can reach 575 F g−1 at 0.5 A g−1 in the voltage window from −1 to −0.5 V. Simultaneously, the FeSi electrode exhibits favorable cycling stability with 76% capacitance retention after 10 000 cycles and outstanding electrical conductivity. This finding provides a novel method of preparing a kind of untapped electrode material, porous FeSi nanoparticles derived from RLs, and the resulting FeSi material shows enormous potential for energy storage via high-performance SCs.
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Solar RRL
·
2021
·Vol. 5
·期 7
·2100067
·
IF 8.582
Congcong Liu,Haijun Su,Keyu Xie,Hongqiang Wang,Peng Zhai,Ninghui Chang,Shan Zhang,Qingfu Ban,Min Guo,Jun Zhang,Lin Liu
SnO 2 aqueous colloids as electron transport layers (ETLs) have been widely employed in planar perovskite solar cells (PSCs). However, the surface defects and energy level mismatch at the SnO 2 ETL/perovskite interface are still great challenges for the power conversion efficiency (PCE) improvement. Herein, a natural and nontoxic phytic acid (PA) compound is introduced into the SnO 2 aqueous colloids to prepare the ETL to depress its defects, and systematically study the influence of different PA complexation on the photovoltaic performance of PSCs. The results demonstrate that PA complexation can assemble unique coordination complexes between PA and SnO 2 nanocrystals (NCs) in a new bonding of Sn O P, which can passivate SnO 2 inherent surface defects and tune the electronic properties of SnO 2 ETLs. PA complexation can significantly disaggregate the SnO 2 oligomers and reduce the cluster size distribution from 98.37 to 15.87 nm. Meanwhile, the reduction of surface trap states inhibits the potential barriers, thus the electrical conductivity is about two times as high as compared with the pristine SnO 2 ETLs. Consequently, a high PCE of 21.43% in PA-SnO 2 -based PSCs is obtained, which presents an improvement of 10.9% over that of the pristine SnO 2 -based PSCs.
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Journal of Energy Chemistry
·
2021
·
IF 9.676
Zeming Gu,Jun Qian,Ran Wang,Meilin Lv,Xiaoxiang Xu,Chun Luo
Layered Aurivillius compound Bi 5 Ti 3 CrO 15 has been synthesized by a hydrothermal method for the application as a photocatalyst to liberate hydrogen from water. Bi 5 Ti 3 CrO 15 owns a narrow band gap ( E g ~2.46 eV) and shows stable photocatalytic activity under both full range ( λ ≥250 nm) and visible light illumination ( λ ≥420 nm). A short hydrothermal reaction time is critical to achieve high photocatalytic activity as defects such as Cr 6+ and Bi 5+ can be avoided. An AQE as high as 3.66% at 420 nm ± 20 nm has been recorded, warranting promising application in the field of solar energy conversions. DFT calculation reveals the important role of Cr 3+ cations for visible light sensitivity of Bi 5 Ti 3 CrO 15 .
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