Small
·
2019
·Vol. 15
·期 6
·1804769
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IF 10.856
Hongjing Wang,Hongjie Yu,Ziqiang Wang,Yinghao Li,You Xu,Xiaonian Li,Hairong Xue,Liang Wang
Electrochemical reduction of N 2 to NH 3 provides an alternative strategy to replace the industrial Haber–Bosch process for facile and sustainable production of NH 3 . The development of efficient electrocatalysts for the nitrogen reduction reaction (NRR) is highly desired. Herein, a micelle-assisted electrodeposition method is presented for the direct fabrication of porous Au film on Ni foam (pAu/NF). Benefiting from its interconnected porous architectonics, the pAu/NF exhibits superior NRR performance with a high NH 3 yield rate of 9.42 µg h −1 cm −2 and a superior Faradaic efficiency of 13.36% at −0.2 V versus reversible hydrogen electrode under the neutral electrolyte (0.1 m Na 2 SO 4 ). The proposed micelle-assisted electrodeposition strategy is highly valuable for future design of active NRR catalysts with desired compositions toward various electrocatalysis fields.
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Journal of Materials Chemistry A
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2019
·Vol. 7
·期 18
·10980-10987
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IF 10.733
Xiaoqing Cao,Jun Zhou,Hongna Wang,Song Li,Wei Wang,Gaowu Qin
Supported Au nanoparticles have been attracting increasing attention due to their unique catalytic performance. However, their thermal and catalytic stability against sintering and aggregation during preparation and reactions remains a serious issue in practical applications, and what is even more difficult is to solve this mutually exclusive problem by a feasible technique. Here, we propose a simple one-step ultra-low temperature interfacial plasma electrolytic oxidation (ULTPEO) process to successfully prepare sub-10 nm and highly stable Au NPs, supported on a porous MgO layer, with high activity and a long lifespan. The obtained Au NPs, with partially exposed free surfaces, are encapsulated into a porous MgO support film. This unique embedded structure restrains their sintering on the support surface during high temperature treatment even up to 600 °C and shows good thermal stability and excellent recyclability in a model reaction of the hydrogenation of 4-nitrophenol. Moreover, the developed technique allows the facile control of the average size of Au NPs down to ∼3 nm with high monodispersity by liquid nitrogen cooling, and hence a further significant improvement in catalytic activity and the lowest catalytic activation energy of ∼14 kJ mol−1 among the reported literature are obtained. This simple technique is also extended to other metal NP catalysts (e.g. Ru and Pd) that support MgO and exhibit excellent catalytic activity for the hydrolysis of sodium borohydride and oxidation of silanes, respectively.
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CATALYSIS COMMUNICATIONS
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2019
·
IF 3.674
Cuncun Zuo,Yun Tian,Yanxia Zheng,Lei Wang,Zhongjun Fu,Tiantian Jiao,Ming Wang,Haofei Huang,Yuchao Li
Series of gold and ceria supported γ-Al 2 O 3 catalysts were developed for the oxidative esterification of methacrolein with methanol. All the catalysts were prepared through one step deposition-precipitation method, and K 2 CO 3 and urea were used as precipitant, respectively. Au, CeO 2 and γ-Al 2 O 3 could self-assemble unique particle morphology during co-precipitation process and form semi-core shell or core shell structure after calcination . The relationship between catalytic reactivity and structural characteristics were analyzed by SEM, TEM, EDS, BET, XRD, XPS, etc. Among Au-CeO 2 /γ-Al 2 O 3 (K 2 CO 3 ), Au-Ce/γ-Al 2 O 3 (Urea) and Au/γ-Al 2 O 3 (Urea) catalysts with different active components and precipitant, the last two exhibited higher catalytic activity. Moreover, the Ce-doped catalysts shown higher stability than just Au supported on pure alumina. The active stability of the optimum Au-Ce/γ-Al 2 O 3 catalyst was evaluated with seven-time cyclic reactions exhibiting high stability and activity with the yield of MMA above 90%.
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Sustainable Materials and Technologies
·
2018
·
IF 0
Jianhua Zhou,Yufei Gu,Ziyang Deng,Lei Miao,Hui Su,Pengfei Wang,Jiaqi Shi
Plasmonic metal/graphene oxide hybrid structures driven by either solar light or laser exhibit strong absorption and multiple functions to realize photothermal therapy, surface enhancement Raman scattering , and solar steam generation. We decorated graphene oxide (GO) by gold nanorods , forming a plasmonic nanofluid with strong optical absorption and enhanced solar steam generation performance. GO nanosheets were modified by using glucose as an environment-friendly ligand and stabilizer in the Au-GO dispersion. The Au-GO dispersions showed an increased absorption in a broad band reaching near infrared region. Owing to the coupling effects between Au NRs and GO NSs, and 2D platform for localized heating, water evaporation can be accelerated by Au-GO dispersions. The solar steam generation efficiency reached 84.1% under 1 kW m −2 illumination, about 20% enhancement compared with GO dispersion alone. This work shows the feasibility of the approach with functionalized nanofluids for efficient solar energy harvesting and utilization.
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NANOTECHNOLOGY
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2019
·Vol. 30
·期 27
·275604
·
IF 3.399
Penghui Li,Wanling Chen,Danni Liu,Hao Huang,Kun Dan,Xiangna Hu,Shaozhou Yu,Paul K Chu,Xue-Feng Yu
We report template growth and dense packing of noble metallic nanoparticles (NPs) on few-layer phosphorene for sensitive surface-enhanced Raman scattering (SERS) detection. Phosphorene obtained by electrochemical exfoliation serves as both the template and reductant in the fabrication of noble metallic NPs which are dispersed on phosphorene without aggregation or pile-up. The BP/Ag/Au and BP/Au/Ag nanocomposites with a nanogap structure exhibit excellent SERS sensitivity and reproducibility with respect to Rhodamine 6G. The BP/Au/Ag nanocomposite is further utilized as the SERS substrate for the detection of two fungicides, thiabendazole and thiram, and detection limits of 10–7 and 10–8 M are achieved. Template growth of Au/Ag nanocomposites is demonstrated to be a green strategy for the fabrication of SERS substrates and has large potential in applications such as pesticide detection.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
·
IF 5.667
Lijia Wang,Wenhong Gu,Pengtao Sheng,Zhiwei Zhang,Bing Zhang,Qingyun Cai
CdS/CuInS 2 /Au/TiO 2 nanotube arrays (NTAs) were fabricated by deposition and dipping technique as well as successive ionic layer adsorption and reaction method, where Au nanoparticles were used to improve the interfacial electron transfer and quantum dots (QDs) of CdS and CuInS 2 (4.1 nm) to stimulate the formation of an ideal stepwise band edge structure with TiO 2 . High and stable photocurrent responses were observed on the NTA electrode. A photoelectrochemical aptasensor toward cytochrome c (cyt c) was then fabricated by immobilization of HS-aptamer on the NTAs via Cd-S bond and Cu-S bond. Sensitive and selective detection of cyt c was achieved with a detection range of 5 pM to 100 nM.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2018
·
IF 5.091
Yitong Wang,Ling Wang,Maiomiao Yan,Anran Cai,Shuli Dong,Jingcheng Hao
Plasmonic microgels (PMgels) of the self-assembled gold nanorods (Au NRs) with side-by-side piles in ionic liquid microgels were prepared. Transmission electron microscopy (TEM) images revealed unique self-growth and self-arrangement of Au NRs in the microgel systems. The fabrication of PMgels occurs through co-assembling Au NRs and an ionic liquid microgel system, therefore differs from the fabrication of conventional plasmonic hybrid nanocomposites . These PMgels showed strong absorption in the near-infrared window and enhanced photothermal conversion efficiency, up to 52.8%, compared to the Au NRs (22%) as a result of the ordering and dense packing of Au NRs in the microgels. When the PMgels were exposed to a near-IR laser, the doxorubicin hydrochloride (Dox) released from PMgels and the resulting thermal effect can immensely inhibit tumor growth both in vitro and in vivo. The tests demonstrated that no tumor metastasis occurred. This platform of the PMgels with the laser-controlled delivery system could provide chemo-photothermal synergistic therapy for a wide spectrum of diseases.
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Materials
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2019
·Vol. 12
·期 12
·1978
·
IF 2.972
Wei Sun,Shaowen Huang,Siyu Zhang,Qi Luo
Nanomaterials extensively studied by nanotechnology scientists have been extensively applied in biomedicine, chemistry, physics and other fields nowadays. Magnetic nanoparticles, surpassing nano applications, are found to possess many advantages over nonmagnetic nanomaterials. Graphene oxide (GO), in particular, draws growing scholarly attention due to its large surface area, good water solubility and biocompatibility, rich surface functional group and easy-to-modify property. In this paper, we modify the Polyethylene mide (PEI) molecule on the surface of GO to increase its biocompatibility. The Au-Fe3O4nanoparticles and folic acid molecules on the ligand make the resulting composite applicable both in magnetic resonance imaging and in cancer cell targeting. In addition, the π-π accumulation of doxorubicin used to load the anticancer drug can release the drug under the acid condition of the cancer cells, detect the cancer cells by fluorescence and realize the multi-mode detection of cancer cells.Keywords:graphene oxide;Au-Fe3O4nanoparticles;targeting cancer cells;drug delivery
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Catalysis Science & Technology
·
2018
·Vol. 8
·期 5
·1395-1403
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IF 5.365
Yanyan Duan,Shaochen Zhou,Zhihong Chen,Jianmin Luo,Mei Zhang,Fu Wang,Tao Xu,Chuanyi Wang
An efficient photoelectrochemical water splitting system is developed based on a hierarchical TiO2 nanowire/microflower (H-TiO2) photoanode, which is synthesized via a one-step hydrothermal process. The H-TiO2 structure is formed via three primary self-assembly processes and simultaneously offers excellent ultraviolet light absorption capacity and large specific surface area. The H-TiO2 photoanode achieves a 1.3 fold enhancement in photocurrent density compared to its TiO2 nanowire-based counterpart at 1.23 V vs. reversible hydrogen electrode (the theoretical potential for water electrolysis). More strikingly, by incorporating the surface plasmon resonance (SPR) effect from Au nanoparticles (NPs), the resulting Au/H-TiO2-based photoanodes (Au/H-TiO2) exhibit an about two-fold enhancement in photocurrent density under both simulated sunlight and visible-light illumination. Moreover, the maximum photoconversion efficiency of Au/H-TiO2 gives three fold enhancement compared to that in the absence of Au NPs. Significantly, Au NPs incorporated on the H-TiO2 surface also serve as co-catalysts like Pt under white-light illumination, reducing the onset potential by about 0.15 V and the current saturation potential by about 0.18 V. The enhanced photoactivity under white light is due to the co-action of electron transfer from the efficient carrier separation of H-TiO2 (ultraviolet part) and Au to H-TiO2 under the SPR effect (visible part). The present study provides a new strategy for designing and fabricating TiO2-based devices with favorable energy conversion efficiency for photoelectrochemical water splitting.
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MATERIALS & DESIGN
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2018
·
IF 4.525
Song Chen,Tianlong Wang,Yunhong Yao,Aili Wei
Novel fibrous [email protected] @Au composites with superior photo-catalytic activity were facilely synthesized through combination of electrospinning technique , bio-mineralization, and in situ immobilization . Silica nanofibers with the diameter of 486 ± 60 nm were synthesized through electrospinning of the sol-gel mixture of gelatin, tetraethoxysilane , acetic acid, water, and calcium chloride followed by sintering process . After bio-mineralization in the Kokubo's simulated body fluid, silica nanofibers supported in situ deposition of fibrous apatite nanosheet flowers to produce fibrous [email protected] composites. SEM observations showed that the [email protected] composites had the fibrous feature with the diameter of 2498 ± 608 nm and their surface was very rough and constructed by numerous apatite nanosheets with the thickness around 10 nm. XRD patterns showed that the fibrous [email protected] composites presented the characteristic diffraction peaks at 26° and 32° assigned to apatite components. FT-IR spectra revealed that [email protected] composites contained both Si O Si bonds and P O P groups. After immersion in the suspension of Au nanoparticles , the [email protected] composites supported the in situ immobilization of Au nanoparticles to produce [email protected] @Au composites. When incubated in the aqueous mixture of 4-nitrophenol and NaHB 4 , the fibrous [email protected] @Au composites presented a superior photo-catalytic activity and rapidly catalyzed the reduction of 4-nitrophenol to 4-aminophenol.
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PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2018
·Vol. 35
·期 5
·1700379
·
IF 4.384
Xiaotong Li,Junshu Zhang,Shufang Kou,Xianfeng Yang,Xia Guo,Jian Yang
Pt/Co and Au are organized into well-defined nanostructures by a simple and mild method, such as dumbbell-like nanorods and core–shell nanorods. The resultant dumbbell-like nanorods show a superior performance in the electrooxidation of formic acid, as compared with core–shell nanorods, Pt-tipped gold nanorods, and commercial Pt/C. This result can be attributed to electronic effect between Au and Pt, heteroatom effect of Co, irregular surface at the tips, and the interface effect.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Sisi Liu,Ming-Yu Li,Dong Su,Muni Yu,Hao Kan,Huan Liu,Xian Wang,Shenglin Jiang
Tunable plasmonic resonance induced by the collective oscillation of the electrons on metallic nanostructures can excellently enhance the light response of ZnO films, which provides an effective way to break through the limitation of the performance of ZnO photodetectors. Here, broad-band high-performance ZnO/Au heterostructures photodetectors with various morphologies of self-assembled Au nanoantennas are fabricated via a facile approach under the spin-coated ZnO colloidal quantum dots films. With a systematic control on growth condition, the self-assembled Au nanoantennas undergo a drastic evolution from the corrugated nanomounds to the island-like nanostructures, and the light absorption of the resulting ZnO/Au heterostructures correspondingly exhibits a strongly morphological dependence on the Au nanoantennas. Meanwhile, the photoresponse of the ZnO-based photodetectors is significantly improved throughout a wide spectrum between UV and visible regions owing to the enhanced light absorption induced by the localized surface plasmon resonance. As a result, the optimal switch ratio of the ZnO/Au heterostructures photodetector increases by 1 order to ∼1.13 × 105 than that of the pristine ZnO one because of the obviously increased photocurrent (Iph) and comparable dark current, thus leading to ∼9.1 and ∼4.9 times increases in the photoresponsivity and the normalized detectivity. Meanwhile, the significant increases in the Iph of ∼5.2 and ∼9.7 times are likewise observed with the ZnO/Au heterostructures under 530 nm and white-light illumination. This work can offer a handy and effective approach for the fabrication of ultrasensitive ZnO-based photodetectors within a broad-band wavelength by utilizing the Au plasmonic nanostructures.
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