ACS Applied Materials & Interfaces
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2023
·
IF 9.5
Xiancai Jiang,Siqi Wei,Jinquan Wang
Hydrogel electrolytes are ideal for flexible wearable electronic devices because of their high ionic conductivity, flexibility, and biocompatibility. However, some problems, such as poor mechanical properties, low conductivity, and lack of adhesivity, are encountered in the process of hydrogel preparation and application, which restrict the further development of hydrogel electrolytes. In this study, PVA was used as the first network, and P(AM-co-AMPS) as the second network to prepare a double-network hydrogel electrolyte. Laponite and Na2SO4 were introduced into the hydrogel during hydrogel formation as the nanofiller and salt with the salting-out effect to enhance its mechanical properties. The hydrogel electrolyte with high toughness (1663 kJ·m–3), adhesivity (77 kPa), and ionic conductivity (1.7 S·m–1) was obtained. In addition, the hydrogel electrolyte also has excellent antifatigue performance. In the 10 consecutive tensile cycles, the tensile strength does not decay. Due to the high adhesivity of the hydrogel electrolyte, a symmetrical all-solid-state supercapacitor was assembled with a tight interface between the hydrogel electrolyte and the AC/CNT composite electrode. The supercapacitor has a high specific capacitance of 186.1 mF·cm–2 at the current density of 1 mA·cm–2. In addition, the capacitor has good flexibility and can withstand bending at various angles. The hydrogel electrolyte also has excellent strain sensing performance, with an ultrafast tensile response time (0.17 s) and high sensitivity factor (GF = 10.01). Finally, the self-powered sensor system composed of a supercapacitor as the power supply device and hydrogel electrolyte as the sensing part was obtained and applied to human motion monitoring, which provides a potential application in the integrated flexible electronic system.
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高影响因子
Analytical Methods
·
2023
·Vol. 15
·期 35
·4582-4590
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IF 3.1
Xiurui Ke,Jinran Chen,Lin Chang,Zhou Zhou,Wei Zhang
p-Nitrophenol (PNP) is widely used in pesticides, pharmaceuticals, and dyestuffs. It is vital to detect trace PNP in the environment, because it poses significant environmental hazards due to its high toxicity. In this paper, a new method was reported for preparing a SERS substrate with excellent SERS activity by combining self-assembly techniques and flexible materials. First, the three-dimensional (3D) polystyrene (PS) photonic crystal (PC) structural master was fabricated by stacking two layers of self-assembled PS nanospheres with different diameters. Polydimethylsiloxane (PDMS) with a complementary structure to the master was obtained by casting, curing and peeling off. Finally, the PDMS–Ag substrate was fabricated by sputtering a thin Ag layer on the PDMS structure. The enhancement factor (EF) of the PDMS–Ag substrate was calculated to be 2.90 × 109 by using 4-amino thiophenol (ATP) as the probe molecule, and the limit of detection (LOD) for ATP can reach 10−11 M. And the RSD of the SERS intensity for the peak at 1078 cm−1 on the PDMS–Ag substrates from batch to batch was within 2%, indicating the high reproducibility of the as-prepared substrate. The quantitative analysis of PNP was achieved with a LOD of 10−8 M. Therefore, the PDMS–Ag substrate exhibits high sensitivity and reproducibility, and it can detect PNP in trace amounts, with great potential for detecting other contaminants.
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CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Chengming Wu,Quan Wang,Jifan Li,Chun-Ling Liu,Wen-Sheng Dong
Catalytic conversion of biomass-derived platform chemicals into bulk chemicals p -xylene (PX) is appealing yet challenging due to low catalytic efficiency and severe reaction conditions. In this work, we fabricated a series of phosphate-modified ZrO 2 /SBA-15 ( x P-Zr/SBA-15) via adjusting the addition of phosphoric acid, and used them for the catalytic conversion biomass-derived 2,5-dimethylfuran (DMF) and ethylene to PX. Because of the enhanced adsorption capability for the reactant molecules (DMF and ethylene) and the good synergistic effect between Brønsted acid sites (P-OH) and Lewis acid sites (Zr 4+ ), 30P-Zr/SBA-15 revealed an excellent catalytic performance in the selective conversion of DMF into PX. The DMF conversion was 98.5%, PX yield was 92.0% at 250 °C for 12 h, and the corresponding PX productivity was upto 50.5 mmol PX ·g cat −1 ·h −1 . The results are far superior to those obtained on most previously reported catalysts in the literature under similar reaction conditions. The kinetic study revealed that 30P-Zr/SBA-15 has a lower apparent activation energy for the tandem reaction including the Diels-Alder reaction (57.0 kJ·mo −1 ) and dehydration reaction (37.7 kJ·mo −1 ). Moreover, the 30P-Zr/SBA-15 catalyst exhibited the excellent recyclability and could be recycled at least six times without a significant loss of activity. On the basis of the temperature-programmed surface reaction of DMF and ethylene, a reasonable reaction mechanism was proposed.
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DIAMOND AND RELATED MATERIALS
·
2023
·
IF 4.1
Baijian Feng,Zihao Chen,Na Li,Yongguang Bi,Fansheng Kong,Zhong Wang,Shaofan Tan
In this work, for the first time, biomass-derived carbon dots (AMP-CDs) with strong water solubility, antioxidant activity and good biocompatibility were synthesized by a one-step microwave method using Allium macrostemon Bunge polysaccharides (AMP) as the main carbon source, L-cysteine as the nitrogen and sulfur source, and phosphoric acid as the phosphorus source. The results showed that sphere-like AMP-CDs with an average particle size of about 2.34 ± 0.49 nm were successfully prepared, with good resistance to salt and photobleaching, and maintained high fluorescence intensity under normal pH conditions in human body. AMP-CDs were highly resistant to 2,2-diphenyl-1-pycrylhydrazyl (DPPH), 2,2′-Azinobis- (3-ethylbenzthiazoline-6-sulphonate) (ABTS) and hydroxyl radical (·OH) with significantly higher scavenging ability than AMP , with IC 50 (μg/mL) of 10.240, 7.265, and 574.730, respectively. In addition, AMP-CDs can be selectively used for the sensitive detection of Cr 6+ with the limit of detection was 5.25 μM, and satisfactory results were obtained for the Cr 6+ recovery experiments of actual environmental samples. In vitro cytotoxicity and hemolytic activity assays showed that AMP-CDs have good biocompatibility and can smoothly enter cells for clear imaging. Therefore, AMP-CDs are likely expected to be applied as a potential antioxidant and metal ion detection probe in the field of drug and food, environmental and biological scenario samples for metal ion detection analysis.
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MICROCHEMICAL JOURNAL
·
2023
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IF 4.8
Linghui Cao,Haoye Wang,Bowen Chen,Shixin Jiang,Zilong Su,Kaixuan Chen,Jiajun Wang,Aijuan Xie,Shiping Luo
Using metal–organic frameworks (MOFs) as the precursor and carbon spheres as the template, LaFe x Ni (1-x) O 3 (x = 1, 0.8, 0.6, 0.4, 0.2, 0) perovskite-type oxides were synthesized. The structure, morphology and valence state of as-prepared perovskite-type oxides were characterized by X-ray diffraction, scanning electron microscope, transmission electron microscopy, and X-ray photoelectron spectroscopy. Cyclic voltammetry and electrochemical impedance techniques were used to study the effect of Ni-doping ratios on the electrocatalytic performance of perovskite. The differential pulse voltammetry was used to measure the content of p-aminophenol (PAP) and paracetamol (PAT) through the LaFe 0.6 Ni 0.4 O 3 modified glassy carbon electrode. The experiment shows that among LaFe x Ni (1-x) O 3 (x = 1, 0.8, 0.6, 0.4, 0.2, 0) perovskite-type oxides, LaFe 0.6 Ni 0.4 O 3 was best electrode material due to its low charge transfer resistance and high electrochemical active surface area. The linear ranges of PAP and PAT were both 1.0–100.0 μM under optimized conditions, while the detection limits were 0.111 and 0.162 μM (S/N = 3), respectively. The practicality of the suggested sensor was explored through the simultaneous detection of PAP and PAT in real samples, and satisfactory findings in acetaminophen pills were obtained.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Shuangying Li,Qingxiang Zhou,Zhi Li,Menghua Liu,Yanhui Li,Chunmao Chen
In this work, an effective fluorescent probe for analysis of p-aminoazobenzene (p-AZO) was established with carbon dots (CDs) and magnetic molecularly imprinted nanomaterial , in which CDs and the magnetic nanomaterial were simultaneously derived from prussian blue (PB) by one-pot hydrothermal method . The sensitivity of the constructed probe is greatly improved owing to the introduction of magnetic solid phase extraction. Factors affecting the enrichment efficiency and detection performance of p-AZO were optimized. Under optimal conditions, the probe exhibited good selectivity and sensitivity for p-AZO. Good linearity was achieved in the range of 2–600 nmol L −1 . Low detection limit for p-AZO was 1 nmol L −1 . Satisfactory recoveries in the range of 95.8–98.7% were obtained at two spiked concentrations of 0.02 and 0.1 μmol L −1 , indicating that the probe established with CDs and MMIPs based MSPE was reliable and robust for determination of p-AZO in real water samples.
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Nanoscale
·
2023
·Vol. 15
·期 17
·7803-7811
·
IF 6.7
Tian Sun,Tong Chen,Jiahao Chen,Qiang Lou,Zihao Liang,Guijun Li,Xiaoyun Lin,Guoshen Yang,Hang Zhou
Despite the impressive developments in perovskite optoelectronic devices, their long-term stability remains a major challenge. Chemical reactions and ion exchange at the metal/perovskite contact interface are two significant factors that lead to the failure of perovskite devices. To address this issue, a titanium nitride (TiN) layer is introduced as a robust corrosion-resistant coating between perovskite films and metal electrodes. By introducing TiN layer, a perovskite photodiode with dark current down to 3.25 × 10−11 A cm−2 is realized. Consequently, the TiN-based perovskite photodiode shows a specific detectivity of 1.21 × 1014 cm W−1 Hz1/2, which is approximately two orders of magnitude higher than that of the control device without a TiN layer. Under continuous illumination of a 520 nm green light for 576 000 cycles, the responsivity of the TiN-based photodetector remains at 94.27% of its initial value. The TiN-based photodetector exhibits superior stability under thermal stress. After aging at 85 °C for 572 h, the TiN-based photodetector retains 72% of its initial responsivity. Using the TiN-based photodiode, a perovskite image sensor containing 64 × 64 pixelated perovskite photodiodes is constructed over an amorphous silicon thin-film transistor (TFT) backplane. The perovskite image sensor exhibits real-time imaging capability and long-term stability for over 6 months. This study highlights the importance of using metallic nitrides to achieve high-performance and air-stable perovskite devices for optoelectronic applications.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 17
·11417-11434
·
IF 3.442
Wang Dadao,Li Jian,Xu Zhifeng,Zhu Yeran,Chen Guoxin,Cui Zheng
A novel three-dimensional ball-flower-like g-C 3 N 4 /NiO (GN) photocatalyst was firstly fabricated by a simple two-step calcination method for enhanced degradation capability. Our investigation focuses on the construction of p–n heterojunction and specific ball-flower-like structure to overcome limitations of single-component semiconductors, such as low surface area, poor light response and fast recombination of the photogenerated electrons and holes. Detailed photocatalytic experiments revealed that the novel ball-flower-like GN (50%) exhibited much higher activity for the removal of TC and Cr 6+ than single g-C 3 N 4 , NiO and traditional layered GN. The trapping experiments proved that the superoxide radicals ( \( ^{ \cdot } {\text{O}}_{2}^{ - } \) ), holes (h + ) and electrons (e − )were the main active species in the photodegradation process. Moreover, three different degradation pathways and fourteen intermediate products of TC were also determined by the LC/MS analysis and these intermediates could be further degraded completely into CO 2 , H 2 O, \( {\text{NH}}_{4}^{ + } \) , carboxylic acids and any other inorganic intermediates. These results will benefit the fabrication of other 3D p–n heterojunction photocatalysts and their potential application in treatment of organic pollutants.
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MINERALS ENGINEERING
·
2019
·
IF 3.315
Wenjie Zou,Lu Gong,Jun Huang,Zhijun Zhang,Chunbao Sun,Hongbo Zeng
Selective flocculation separation has been widely used in fine coal flocculation. In order to promote the adsorption selectivity of flocculants onto coal surface, hydrophobically modified polyacrylamide P(AM-NaAA-C 16 DMAAC) was synthesized. The adsorption of P(AM-NaAA-C 16 DMAAC) on model clay and coal surfaces (i.e., silica, alumina and asphaltene surfaces) was investigated using quartz crystal microbalance with dissipation (QCM-D) monitoring technique. Floc size distribution, Fourier transform infrared spectrum, zeta potential measurement and selective flocculation flotation test were also conducted to study the performance of P(AM-NaAA-C 16 DMAAC) in the separation of fine coal. QCM-D measurements showed that a thin and rigid adsorption layer was formed on silica and alumina surfaces after injecting 1 mM sodium hexapolyphosphate (Calgon). This pre-formed layer inhibited the further adsorption of P(AM-NaAA-C 16 DMAAC) on silica and alumina. Meanwhile, the asphaltene surface could not be passivated by calgon due to the weak and reversible adsorption. Thus, a significant amount of P(AM-NaAA-C 16 DMAAC) (20 mg/L) absorbed on the calgon-treated asphaltene surface in 100 mM KCl solution was detected. With 20 mg/L P(AM-NaAA-C 16 DMAAC) in 100 mM KCl and 1 mM calgon solution, the maximum diameters of 10%, 50% and 90% of the cumulative volume distributions of the floc, i.e., d 10 (20.29 μm), d 50 (45.55 μm) and d 90 (89.99 μm) of the coal floc were 7.42, 3.20 and 2.19 times of those of kaolinite floc, respectively. Clean coal with a combustible recovery of 80.87% and ash content of 9.78% was obtained at a dosage of 5 g/t of P(AM-NaAA-C 16 DMAAC) and 900 g/t kerosene. Experimental results demonstrated that selective flocculation flotation with P(AM-NaAA-C 16 DMAAC) could enhance the recovery of fine coal particles with a lower dosage of collector. Our work sheds lights on the fundamental and practical understanding of the hydrophobic interactions in the selective flocculation of coal in the industries, and rational development of flocculants with better selectivity and flocculation efficiency.
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ELECTROCHIMICA ACTA
·
2019
·
IF 5.383
Shifu Wang,Zuoyi Xiao,Shangru Zhai,Guoxiang Wang,Qingda An,Dongjiang Yang
To effectively enhance the overall electrochemical performance of supercapacitors , a high-temperature phosphorization strategy was developed to fabricate core-shell Ni-Ni x P y @C nanocomposite-immobilized sponge-like P-doped porous carbon (Ni-Ni x P y @C/P-HPC). The Ni-Ni x P y @C/P-HPC was successfully constructed by a cross-linking process and subsequent high-temperature calcination . During the pyrolysis process in N 2 multiple steps, including phosphating metal ions to Ni-Ni x P y nanoparticles , forming core-shell Ni-Ni x P y @C nanocomposites, doping P element into carbon skeleton and immobilizing core-shell Ni-Ni x P y @C nanocomposites onto porous carbon, were achieved simultaneously. The Ni-Ni x P y @C/P-HPC was studied using various characterization techniques. The results revealed that the obtained material integrated the advantages of interconnected P-doped framework (fast ion transport), nickel and nickel phosphide species (high theoretical specific capacitance), and graphene-like shell (excellent electrical conductivity and effective protection for activate sites). Therefore, the as-prepared hybrid delivered the outstanding electrochemical performance with ultrahigh specific capacity of up to 1275 F g −1 at 1 A g −1 and an excellent cycling stability with 92.5% capacity retention after 5000 cycles. Besides, the asymmetric supercapacitor using Ni-Ni x P y @C/P-HPC-900 and activated carbon as the anode and cathode materials exhibited a high energy density of 49.4 W h kg −1 at 250 W kg −1 , and remained as high as 30.6 W h kg −1 even at 5000 W kg −1 . Our research will open up a new way to synthesize transition metal phosphide@carbon composites with excellent electrochemical properties.
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Nanomaterials
·
2018
·Vol. 8
·期 12
·1021
·
IF 3.504
Aochen Wang,Ming Hu,Liwei Zhou,Xiaoyong Qiang
Self-powered operation, flexibility, excellent mechanical properties, and ultra-high sensitivity are highly desired properties for pressure sensors in human health monitoring and anthropomorphic robotic systems. Piezoelectric pressure sensors, with enhanced electromechanical performance to effectively distinguish multiple mechanical stimuli (including pressing, stretching, bending, and twisting), have attracted interest to precisely acquire the weak signals of the human body. In this work, we prepared a poly(vinylidene fluoride-trifluoroethylene)/ multi-walled carbon nanotube (P(VDF-TrFE)/MWCNT) composite by an electrospinning process and stretched it to achieve alignment of the polymer chains. The composite membrane demonstrated excellent piezoelectricy, favorable mechanical strength, and high sensitivity. The piezoelectric coefficient d33value was approximately 50 pm/V, the Young’s modulus was ~0.986 GPa, and the sensitivity was ~540 mV/N. The resulting composite membrane was employed as a piezoelectric pressure sensor to monitor small physiological signals including pulse, breath, and small motions of muscle and joints such as swallowing, chewing, and finger and wrist movements. Moderate doping with carbon nanotubes had a positive impact on the formation of the β phase of the piezoelectric device, and the piezoelectric pressure sensor has the potential for application in health care systems and smart wearable devices.Keywords:self-powered electronics;piezoelectric pressure sensor;P(VDF-TrFE);MWCNTs;electrospinning;wearable biomedical devices
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2019
·
IF 2.931
Yue Hu,Yong Jia,Yunwen Liao,Xiaohui Jiang,Zhengjun Cheng
Poly(sodium-p-styrenesulfonate)-enhanced and D-penicillamine stabilized Ag nanoclusters (PSS-DPA-AgNCs) were prepared using one-step ultraviolet irradiation combined with microwave heating method, and the effects of the AgNCs photo-luminescence performance based on different types of polyelectrolytes and energy suppliers were studied detailedly. The as-prepared AgNCs can be used as a viable fluorescent probe for monitoring indirectly iron(II) lactate hydrate (ILH) and ammonium ferric citrate (AFC), respectively. The fluorescence (FL) quenching of PSS-DPA-AgNCs by Fe 3+ (it is obtained from oxidized ILH/ionized AFC) mainly derives from a dynamic quenching process. Excellent linear relationships exist between the FL quenching degree of the AgNCs and the concentrations of ILH/AFC in the range of 0.17–6.00/0.067–3.33 μmol·L −1 , and corresponding limit of detection (at 3σ/slope) is 12.4/6.04 nmol·L −1 . Moreover, the AgNCs probe was extended to the assays of ILH in tablets, solid beverage or ILH additive and AFC in two kinds of edible salts or syrup with satisfactory results compared with the standard 1, 10-phenanthroline method. In addition, the AgNCs probe reveals a good temperature sensing capability.
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