ACS Nano
·
2020
·
IF 14.588
Tao Liang,Enshan Liu,Minghui Li,Elena V. Ushakova,Stephen V. Kershaw,Andrey L. Rogach,Zikang Tang,Songnan Qu
In this work, we report a successful extension of the family of light-emitting colloidal carbon nanostructures to a number of different shapes and morphologies, namely, carbon nanorolls (CNRs) and carbon nanobelts (CNBs). Near infrared (NIR)-emissive CNRs were synthesized via a solvothermal fusion of carbon dots (CDs) triggered by a dehydration process of their surface functional groups. They appear in a form of short cylinders, with diameters ranging from 20 to 40 nm and cylinder lengths ranging from 7 to 20 nm. In ethanol solution, CNRs have a maximum absorption peak at 665 nm and a NIR emission band extending from 650 to 800 nm, with a photoluminescence quantum yield of 9.2%. Intriguingly, the rolled structure of CNRs can be uncoiled under 655 nm laser irradiation (power density 1 W·cm–2) of their solution in ethanol, forming CNBs with a width of 7–20 nm and lengths reaching several hundreds of nanometers, which is accompanied by a considerably decreased absorption band at 665 nm and a decreased NIR emission. This unfolding is ascribed to the decrease of the strength of interlayer hydrogen bonding, owing to the photothermally induced dehydration and further carbonization of the CNRs. Alongside the decreased NIR emission, CNBs exhibit enhanced green and red emissions under UV and green light excitation, respectively, which allows us to demonstrate multiple-level luminescence encryptions on a paper stamped with CNR- and CNB-inks.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 46
·23395-23402
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IF 7.443
Weiyang Lv,Miao Du,Weijuan Ye,Qiang Zheng
The formation mechanism of layered double hydroxide (LDH) nanoscrolls via a trinal-phase hydrothermal system has been investigated via powder X-ray diffraction and transmission electron microscopy (TEM) at different reaction temperatures and times. LDH nanosheets formed at first and subsequently developed into nanoscrolls. Notably, the investigation confirmed that urea and pressure played key roles in the formation of the one-dimensional LDH structure. Further observations by scanning electron microscopy and high-resolution TEM indicated that the nanoscrolls with apparent hollow cores were derived from nanosheets through a roll-up process, rather than through the control of the crystal growth in one particular direction. A detailed model was also proposed to describe the reaction process based on the assumption that the LDH growth units are anion coordination octahedra. Furthermore, owing to the increased specific surface area and novel structure, the nanoscrolls exhibit high adsorption capacity and excellent reusability in the adsorption of methyl orange in aqueous solution.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 8
·4113-4122
·
IF 7.233
Bo Tang,Zhiyuan Xiong,Xiawei Yun,Xiaogong Wang
Herein we report a new approach to fabricating nanoscrolls through the self-assembly of graphene oxide (GO) sheets in a dispersion. The assembly process for GO nanosheets was induced by the dropwise addition of an appropriate organic solvent such as N,N-dimethylformamide (DMF) into the aqueous dispersion. The results show that nanoscrolls were gradually formed from the GO sheets by rolling-up in a piece-by-piece manner with the increase of the DMF content. The transmission electron microscopic analysis indicates that for a typical case, the nanoscrolls have an average diameter of 242 ± 102 nm at the central part and the interlayer spacing between adjacent GO layers is 0.58 nm. The scrolls were estimated to have 207 turns and include on average 42 pieces of GO sheets per scroll. By this method, GO sheets with different sizes and oxidation degrees were proved to be able to form GO nanoscrolls in a similar way. Moreover, it is interesting that the diffraction efficiency of surface-relief-gratings photoinduced on the film of azo molecular glass was significantly enhanced by doping the GO nanoscrolls with a very low content (0.5 wt%); this suggests a possible new application for the GO scrolls in optical devices. This facile approach, which is also feasible by using other organic solvents such as ethanol, can be used to fabricate GO nanoscrolls for large scale applications in supercapacitors, sensors and other devices.
研究领域:
材料科学
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纳米技术
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光学工程
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DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2017
·Vol. 28
·期 46
·465401
·
IF 3.44
Yuewen Liu,Ahmad Hassan Siddique,Heran Huang,Qile Fang,Wei Deng,Xufeng Zhou,Huanming Lu,Zhaoping Liu
A new conductive carbon hybrid combining both reduced graphene nanoscrolls and carbon nanotubes (rGNSs-CNTs) is prepared, and used to host Fe3O4 nanoparticles through an in situ synthesis method. As an anode material for LIBs, the obtained Fe3O4@rGNSs-CNTs shows good electrochemical performance. At a current density of 0.1 A g−1, the anode material shows a high reversible capacity of 1232.9 mAh g−1 after 100 cycles. Even at a current density of 1 A g−1, it still achieves a high reversible capacity of 812.3 mAh g−1 after 200 cycles. Comparing with bare Fe3O4 and Fe3O4/rGO composite anode materials without nanoscroll structure, Fe3O4@rGNSs-CNTs shows much better rate capability with a reversible capacity of 605.0 and 500.0 mAh g−1 at 3 and 5 A g−1, respectively. The excellent electrochemical performance of the Fe3O4@rGNSs-CNTs anode material can be ascribed to the hybrid structure of rGNSs-CNTs, and their strong interaction with Fe3O4 nanoparticles, which on one hand provides more pathways for lithium ions and electrons, on the other hand effectively relieves the volume change of Fe3O4 during the charge–discharge process.
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Lu Wu,Chang Xu,Mingshuai Fan,Ping Tang,Rui Zhang,Shuaitao Yang,Lujun Pan,Yuezhen Bin
Flexible sensors have wide-ranging application prospects in the field of human health motion monitoring. However, it is still a challenge to design and prepare strain sensors with both high sensitivity and wide operating range. Inspired by the fiber connection structure of lotus root, the carbon nanocoils (CNCs) with large aspect ratio (acting as the lotus root fibers) is used as a conductive bridge to connect the fragile Ti 3 C 2 -MXene nanosheet layers, significantly enhancing the sensing range of the sensor. Waterborne polyurethane (WPU) encapsulated strain sensor (Ti 3 C 2 /CNCs/WPU) can achieve GF values and sensing ranges of 474 and 220%, respectively. In addition, this sensor shows reliable responses at different frequencies and can withstand more than 1000 stretch-release cycles. More importantly, the composite strain sensor can accurately sense and monitor different limb movements and human body motion states, showing broad application prospects in real-time human health detection.
研究领域:
材料科学
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生物医学工程
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传感器技术
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产品关联
DOI
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 4
·548
·
IF 4.034
Weihao Zhao,Lin Wang,Chengjie Pei,Cong Wei,Hui You,Jindong Zhang,Hai Li
Recently, graphene oxide nanoscroll (GONS) has attracted much attention due to its excellent properties. Encapsulation of nanomaterials in GONS can greatly enhance its performance while ion encapsulation is still unexplored. Herein, various ions including hydronium ion (H3O+), Fe3+, Au3+, and Zn2+were encapsulated in GONSs by molecular combing acidic graphene oxide (GO) solution. No GONS was obtained when the pH of the GO solution was greater than 9. A few GONSs without encapsulated ion were obtained at the pH of 5–8. When the pH decreased from 5 to 0.15, high-density GONSs with encapsulated ions were formed and the average height of GONS was increased from ~50 to ~190 nm. These results could be attributed to the varied repulsion between carboxylic acid groups located at the edges of GO nanosheets. Encapsulated metal ions were converted to nanoparticles in GONS after high-temperature annealing. The resistance-type device based on reduced GONS (rGONS) mesh with encapsulated H3O+showed good response for applied pressure from 600 to 8700 Pa, which manifested much better performance compared with that of a device based on rGONS mesh without H3O+.Keywords:graphene oxide nanoscroll;pH value;ion encapsulation;mesh structure;pressure sensing
研究领域:
材料科学
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纳米技术
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传感器技术
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产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2018
·
IF 11.698
Jiapeng Liu,Yizhe Liu,Danyun Xu,Yuanzhi Zhu,Wenchao Peng,Yang Li,Fengbao Zhang,Xiaobin Fan
Developing highly efficient noble-metal-free electrocatalysts for hydrogen evolution reaction (HER) has attracted increasing attentions. Here, we report a simple strategy to synthesize the hierarchical “nanoroll” like MoS 2 /Ti 3 C 2 T x hybrid by combining liquid nitrogen-freezing and subsequent annealing. The quick freezing of the Ti 3 C 2 T x nanosheets and ammonium tetrathiomolybdate mixture causes a sudden change in the strain of Ti 3 C 2 T x , which leads to an interesting “nanoroll” like hierarchical structure. After annealing at H 2 /Ar atmosphere, vertically aligned molybdenum sulfide (MoS 2 ) crystallites are in situ formed in and on the nanoroll like Ti 3 C 2 T x . Notably, this hierarchical MoS 2 /Ti 3 C 2 T x hybrid exhibits excellent HER catalytic activity with a small onset overpotential of 30 mV, and a more than 25-fold increase in the exchange current density compared with MoS 2 was observed.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
POLYMER COMPOSITES
·
2016
·Vol. 39
·期 2
·448-456
·
IF 2.004
Bing Xue,Huimin Wang,Maosheng Xia,Xingyuan Wang,Kuo Yang,Qianwen Chi,Fangfei Li,Yinshan Jiang
Nacrite nanorolls were prepared by the delamination and rolling of the platy nacrite particles and the nacrite nanorolls were melt-compounded with LLDPE to prepare a novel Nacrite/LLDPE composite. In this method, hexylamine was intercalated into the interlayer space of methoxy-modified nacrite precursor and the deintercalation of nacrite-hexylamine intercalation complex in toluene resulted in the delamination and rolling of nacrite layers. The nacrite nanorolls were composed with linear low-density polyethylene (LLDPE) to prepare a novel Nacrite/LLDPE composite. X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and N 2 adsorption–desorption test were used to evaluate the prepared nacrite nanorolls. The results showed that the interlayer octahedral surface of nacrite was grafted with methanol and the methoxy-modified nacrite was intercalated with hexylamine. The deintercalation of nacrite-hexylamine intercalation complex in toluene disturbed the orderly arrangement of nacrite layers, leading to a delamination of the layered particles and subsequent formation of aluminosilicate nanorolls. The specific surface area (SSA) and V por value of nacrite nanorolls reached 34.69 m 2 /g and 0.22 cm 3 /g (4.52 m 2 /g and 0.13 cm 3 /g for raw nacrite). Furthermore, the mechanical properties test confirmed that the introduction of nacrite nanorolls into LLDPE matrix could improve the tensile and tear strength. 6.4% and 6.8% higher tensile strength than the pure LLDPE were observed for Nacrite/LLDPE composite with 2 wt% and 4 wt% nacrite nanorolls filler. POLYM. COMPOS., 39:448–456, 2018. © 2016 Society of Plastics Engineers
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 9
·1581
·
IF 5.719
Zhikang Wu,Feifei Li,Xiya Li,Yang Yang,Xiao Huang,Hai Li
Due to their unique tubular and spiral structure, graphene and graphene oxide nanoscrolls (GONS) have shown extensive applications in various fields. However, it is still a challenge to improve the optoelectronic application of graphene and GONS because of the zero bandgap of graphene. Herein, ammonium tetrathiomolybdate ((NH4)2MoS4) was firstly wrapped into the ((NH4)2MoS4@GONS) by molecular combing the mixture of (NH4)2MoS4and GO solution on hydrophobic substrate. After thermal annealing, the (NH4)2MoS4and GO were converted to MoS2nanosheets and reduced GO (RGO) simultaneously, and, thus, the MoS2@RGONS was obtained. Raman spectroscopy and high-resolution transmission electron microscopy were used to confirm the formation of MoS2nanosheets among the RGONS. The amount of MoS2wrapped in RGONS increased with the increasing height of GONS, which is confirmed by the atomic force microscopy and Raman spectroscopy. The as-prepared MoS2@RGONS showed much better photoresponse than the RGONS under visible light. The photocurrent-to-dark current ratios of photodetectors based on MoS2@RGONS are ~570, 360 and 140 under blue, red and green lasers, respectively, which are 81, 144 and 35 times of the photodetectors based on RGONS. Moreover, the MoS2@RGONS-based photodetector exhibited good power-dependent photoresponse. Our work indicates that the MoS2@RGONS is expected to be a promising material in the fields of optoelectronic devices and flexible electronics.Keywords:ammonium tetrathiomolybdate;thermal annealing;MoS2@reduced graphene oxide nanoscroll;photosensitivity;photodetection
研究领域:
材料科学
·
光电材料
·
纳米技术
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产品关联
DOI
PubMed
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Jiani Qin,Huannan Wu,Yanli Dong,Fangxin Zhan,Miao Liao,Bao Pan,Chuanyi Wang
The porous semi-coke activated carbon (SAC) was derived from solid waste semi-coke (SC) powder by an activation process. Subsequently, a highly efficient photocatalyst (SAC/CN) was prepared by loading SAC onto carbon nitride (CN). The SAC/CN composite exhibited an increased surface area, well-dispersed layered CN, abundant delocalization electrons, redshift in light absorption, and a more negative conduction band (CB) edge. The optimal 0.7 %SAC/CN 600 sample exhibited the highest H 2 production rate of 12.86 mmol·h −1 ·g −1 , which is 8.0-fold higher than that of pristine CN. The SAC/CN photocatalysts also demonstrated excellent stability and reusability. Photoluminescence (PL) and electrochemical measurements indicated enhanced charge separation/transfer efficiency in the SAC/CN composite. These findings propose a novel approach for recycling of coal chemical solid waste coupled with CN photocatalysts to achieve efficient solar-to-chemical energy conversion.
研究领域:
材料科学
·
能源化学
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产品关联
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 4
·959-966
·
IF 8.183
Wang Lin,Yue Qiuyan,Pei Chengjie,Fan Huacheng,Dai Jie,Huang Xiao,Li Hai,Huang Wei
Recently, transition metal dichalcogenides (TMDCs) nanoscrolls have exhibited unique electronic and optical properties due to their spiral tubular structures, which are formed by rolling up monolayer TMDCs nanosheets. Inspired by the excellent physical and chemical properties of TMDCs van der Waals heterostructures (vdWHs), it is highly desirable to scroll TMDCs vdWHs for potential optoelectronic applications. In this work, WS 2 /MoS 2 vdWHs nanoscrolls were massively prepared by dropping aqueous alkaline droplet on chemical vapor deposition (CVD)-grown bilayer WS 2 /MoS 2 vdWHs, which were formed by growing monolayer WS 2 islands on top of monolayer MoS 2 nanosheets simultaneously. The optical microscopy (OM), atomic force microscopy (AFM), ultralow frequency (ULF) Raman spectroscopy and transmission electron microscopy (TEM) were utilized to characterize the WS 2 /MoS 2 vdWHs nanoscrolls. As-obtained WS 2 /MoS 2 vdWHs nanoscrolls exhibited new ULF breathing mode as well as shear mode peaks due to the strong interlayer interaction. Notably, the photosensitivities of WS 2 /MoS 2 vdWHs nanoscrolls-based devices were about ten times higher than those of WS 2 /MoS 2 vdWHs-based devices under blue, green and red lasers, respectively, which could be attributed to the ultrafast charge transfer at alternative WS 2 /MoS 2 and MoS 2 /WS 2 multi-interfaces in scrolled structure. Our work suggested that TMDCs vdWHs scrolls could be promising candidates for optoelectronic applications.
研究领域:
材料科学
·
光学
·
纳米技术
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产品关联
DOI
高影响因子
Nanoscale
·
2015
·Vol. 8
·期 3
·1413-1420
·
IF 7.394
Bingna Zheng,Zhen Xu,Chao Gao
The output of graphene nanoscrolls (GNSs) has been greatly enhanced to the gram-level by using an improved spray-freeze-drying method without damaging the high transforming efficiency (>92%). The lowest bulk density of GNS foam reaches 0.10 mg cm−3. Due to the unique morphology and high specific surface area (386.4 m2 g−1), the specific capacitances of the GNSs (90–100 F g−1 at 1 A g−1) are all superior to those of multiwalled carbon nanotubes meanwhile maintaining excellent rate capabilities (60–80% retention at 50 A g−1). For the first time, all-graphene-based films (AGFs) are fabricated via the intercalation of GNSs into graphene layers. The AGF exhibits a capacitance of 166.8 F g−1 at 1 A g−1 and rate capability (83.9% retention at 50 A g−1) better than those of pure reduced graphene oxide (RGO) films and carbon nanotubes/graphene hybrid films (CGFs).
研究领域:
材料科学
·
能源存储
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）