Key Laboratory of Food Colloids and Biotechnology

Wuxi, China

Key Laboratory of Food Colloids and Biotechnology

Wuxi, China

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Wang H.,Jiangnan University | Yang Y.,Wuxi Institute of Technology | Zhou X.,Jiangnan University | Li R.,Jiangnan University | And 2 more authors.
New Journal of Chemistry | Year: 2017

This paper reports a new NiCo2S4/tryptophan-functionalized graphene quantum dot nanohybrid (NiCo2S4/Trp-GQDs). NiCo2S4 was fabricated by a one-step hydrothermal reaction and then hybridized with Trp-GQDs to form NiCo2S4/Trp-GQDs. The result shows that the NiCo2S4 offers better structural stability and specific surface area compared to NiCo2S4 prepared by the traditional two-step method. The introduction of Trp-GQDs greatly enhances the electron/ion conductivity of NiCo2S4 and the mechanical properties of the binder layer. The hybrid of NiCo2S4 with Trp-GQDs achieves significant electrochemical synergy. The NiCo2S4/Trp-GQD electrode for supercapacitors provides high specific capacitance (1453.1 F g-1 at a current density of 1 A g-1) and rate-capability (455.6 F g-1 at a current density of 20 A g-1) in a 3.0 M KOH electrolyte using a three-electrode test system. The asymmetric supercapacitor of NiCo2S4/Trp-GQDs/activated carbon exhibits an energy density of 157.1 W h kg-1 at a power density of 800 W kg-1 and 103.2 W h kg-1 at a power density of 4000 W kg-1 in a 3.0 M KOH electrolyte. The energy density is much higher than that of a single NiCo2S4 electrode (67.9 W h kg-1 at a power density of 800 W kg-1 and 37.5 W h kg-1 at a power density of 4000 W kg-1). The excellent capacitive performance means the nanohybrid can be applied in next-generation high-performance supercapacitors. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.


Li M.,Jiangnan University | Cao Y.,Jiangnan University | Cao Y.,Key Laboratory of Food Colloids and Biotechnology | Ni X.,Jiangnan University | Cao G.,Jiangnan University
New Journal of Chemistry | Year: 2017

Three-dimensional photonic crystals with structural regularity and metallic luster have been prepared via a rapid evaporation-induced self-assembly process using Fe3O4@C magnetic nanocomposites (MNCPs) as building blocks. The MNCPs self-assembled into one-dimensional nanochains during solvothermal synthesis. Then the nanochains directly stacked into three-dimensional photonic structures induced by evaporation which greatly accelerated the self-assembly process within 2.5 hours. Effects of three important parameters including temperature, dispersion concentration and the solvent type on evaporation-induced self-assembly have been investigated. It was proved that these factors have a significant impact on structural regularity and lustrousness of the resulting photonic crystals. Meanwhile, photonic crystals with different diffraction colors were obtained by controlling the particle size of MNCPs through adjusting the solvothermal reaction temperature. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.


Lijuan K.,Jiangnan University | Ruiyi L.,Jiangnan University | Yongqiang Y.,Wuxi Institute of Technology | Zaijun L.,Jiangnan University | Zaijun L.,Key Laboratory of Food Colloids and Biotechnology
RSC Advances | Year: 2016

Silicon has great potential to revolutionize the energy storage capacities of lithium ion batteries (LIBs) to meet the ever increasing power demands of next generation technologies. The study reports a multi-faceted design of a silicon anode for high performance LIBs. First, silicon nanoparticles (Si) were encapsulated in three-dimensional interconnected networks of multiple graphene aerogel (MGA-n, inner shell). The inner shell offers a much higher mechanical strength and electronic conductivity compared to common graphene aerogel. Then, MGA-n/Si was embedded in the binder layer (outside shell) composed of tryptophan-functionalized graphene quantum dots (Trp-GQD) and sodium alginate. The introduction of Trp-GQD greatly improves the mechanical strength, elasticity and electronic conductivity of the outside shell. The integration of the inner shell with the outside shell achieves simultaneously good structural integrity, SEI stability at the silicon-electrolyte interface and high ionic/electronic conductivity of the silicon anode. As a result, the Trp-GQD@MGA-n/Si electrode exhibits excellent electrochemical performance for LIBs. The specific capacity is 1427 mA h g-1 at 100 mA g-1, 1115 mA h g-1 at 1000 mA g-1 and 637 mA h g-1 at 4200 mA g-1. The capacity retention is more than 93.3% after 100 cycles at 100 mA g-1 with a high columbic efficiency of about 99.8%. Such a multi-faceted design can also be used for the fabrication of other large-volume-change electrodes for LIBs. ©2016 Royal Society of Chemistry.


Wang J.,Jiangnan University | Li R.,Jiangnan University | Long X.,Jiangnan University | Li Z.,Jiangnan University | Li Z.,Key Laboratory of Food Colloids and Biotechnology
Sensors and Actuators, B: Chemical | Year: 2016

Silicon quantum dots have become attractive nanomaterials due to their excellent biocompatibility and optical performance. However, poor water-solubility greatly limits their wide applications. The paper reported a facile synthesis of imidazole-functionalized silicon quantum dots (termed as IF@SiQDs) via a simple hydrothermal method, in which N-trimethysilylimidazole and sodium citrate were used as the silicon precursor and reducing agent, respectively. The resulted IF@SiQDs exhibits good water-solubility, strong fluorescence with the quantum yield of 30.6% and high photo-stability. More importantly, the competitive coordination of Cu2+ between L-histidine (His) and IF@SiQD creates the unique fluorescence “off-on” response to His. Firstly, Cu2+ was firmly fixed at the surface of IF@SiQD by the coordination bond between Cu2+ and imidazole group to form stable Cum(IF@SiQD)n complex (m > 1, n > 1). A low concentration of His was introduced to partly replace the IF@SiQD in the complex to produce His-Cu-IF@SiQD, leading to an obvious fluorescence quenching. Based on the fluorescence “off” behaviour, IF@SiQD was developed as a novel optical nanosensor for the detection of His at a low level. Its peak fluorescence intensity linearly decreases with the increase the concentration of His in the range of 1.6 × 10−6–2 × 10−4 M with the detection limit of 5.2 × 10−7 M. Further, the His-Cu-IF@SiQD can be changed into non-fluorescent Cu(His)2 complex in the presence of a high concentration of His, accompanying the release of free IF@SiQDs and increase in the fluorescence intensity. Based on the fluorescence “on” behaviour, IF@SiQDs was used for the optical detection of His at a high level. Its peak fluorescence intensity linearly increases with the increase the concentration of His in the range of 2.8–5 × 10−3 M with the detection limit of 2.2 × 10−3 M. The as-proposed method provides the advantage of sensitivity, selectivity and linear range, it has been successfully applied in the fluorescent detection of His in human urine and in medical amino acid injection. The study also opens an avenue for the design of various functional silicon quantum dots that hold the great promise in the potential applications such as nanosensors, biocatalyst and cell imaging. © 2016 Elsevier B.V.


Juanjuan Z.,Jiangnan University | Ruiyi L.,University of Birmingham | Zaijun L.,Jiangnan University | Zaijun L.,Key Laboratory of Food Colloids and Biotechnology | And 3 more authors.
Nanoscale | Year: 2014

Graphene aerogel materials have attracted increasing attention owing to their large specific surface area, high conductivity and electronic interactions. Here, we report for the first time a novel strategy for the synthesis of nitrogen-doped activated graphene aerogel/gold nanoparticles (N-doped AGA/GNs). First, the mixture of graphite oxide, 2,4,6- trihydroxybenzaldehyde, urea and potassium hydroxide was dispersed in water and subsequently heated to form a graphene oxide hydrogel. Then, the hydrogel was dried by freeze-drying and reduced by thermal annealing in an Ar/H2 environment in sequence. Finally, GNs were adsorbed on the surface of the N-doped AGA. The resulting N-doped AGA/GNs offers excellent electronic conductivity (2.8 × 103 S m-1), specific surface area (1258 m2 g-1), well-defined 3D hierarchical porous structure and apparent heterogeneous electron transfer rate constant (40.78 ± 0.15 cm s-1), which are notably better than that of previous graphene aerogel materials. Moreover, the N-doped AGA/GNs was used as a new sensing material for the electrochemical detection of hydroquinone (HQ) and o-dihydroxybenzene (DHB). Owing to the greatly enhanced electron transfer and mass transport, the sensor displays ultrasensitive electrochemical response to HQ and DHB. Its differential pulse voltammetric peak current linearly increases with the increase of HQ and DHB in the range of 5.0 × 10-8 to 1.8 × 10-4 M for HQ and 1 × 10-8 to 2.0 × 10-4 M for DHB. The detection limit is 1.5 × 10 -8 M for HQ and 3.3 × 10-9 M for DHB (S/N = 3). This method provides the advantage of sensitivity, repeatability and stability compared with other HQ and DHB sensors. The sensor has been successfully applied to detection of HQ and DHB in real water samples with the spiked recovery in the range of 96.8-103.2%. The study also provides a promising approach for the fabrication of various graphene aerogel materials with improved electrochemical performances, which can be potentially applied in biosensors, electrocatalysis, and energy storage/conversion devices. This journal is © the Partner Organisations 2014.


Yan T.,Jiangnan University | Li R.,Jiangnan University | Yang T.,Jiangnan University | Li Z.,Jiangnan University | Li Z.,Key Laboratory of Food Colloids and Biotechnology
Electrochimica Acta | Year: 2015

Electroactive materials with hollow nanostructures received great attractiveness due to large surface area, low density and superior structure permeablity. The paper reported a new template synthesis of nickel/cobalt layered double hydroxides (Ni/Co-LDH) without any adscititious alkali source, oxidant and step for removal of the template. Nickel nitrate, cobalt nitrate and SiO2 nanosphere were dispersed in an ethanol solution. Then, the mixed soution was heated at 160°C for 6 h to obtain Ni/Co-LDH product. During the process, ethanol and nitrate underwent a redox reaction releasing hydroxide ions, which will react with nickel and cobalt ions to form ultrathin Ni/Co-LDH nanoflakes. Meanwhile, SiO2 template was gently dissolved by hydroxide ions. Interestingly, perfect match between generation rate of Ni/Co-LDH nanoflakes and removal rate of the template creates an elaborate three-dimensional structure with well-defined hollow interior and hydrangea-like exterior. The unique structure will greatly improve electron and mass transfer during the faradic redox reaction. The Ni/Co-LDH electrode exhibits excellent electrochemical performance for supercapacitors. Its specific capacitance is up to 2158.7 F g-1 at the current density of 1 A g-1 and 1965.6 F g-1 at the current density of 5 A g-1. The capacitance can keep at least 97.5% of initial value after 1500 cycles. The study also provides prominent approach for the fabrication of hollow nanomaterials with three-dimensional structure for supercapacitors, Li-ion batteries, catalyst and sensors. © 2014 Elsevier Ltd. All rights reserved.


Xiaofei W.,Jiangnan University | Ruiyi L.,University of Birmingham | Zaijun L.,Jiangnan University | Zaijun L.,Key Laboratory of Food Colloids and Biotechnology | And 3 more authors.
RSC Advances | Year: 2014

Gold nanoclusters possess outstanding physical and chemical attributes that make them excellent scaffolds for construction of chemical and biological sensors. The paper reported synthesis of double gold nanoclusters/graphene oxide (D-GNCs/GO) and its application as a new fluorescence probe for Hg2+ detection. In the study, the amine group was introduced into GO sheets through the EDC/NHS mediated reaction to form positively charged GO sheets (GO-NH 3 +). After GNC@Lys was mixed with GNC@BSA to form negatively charged D-GNCs, the D-GNCs was assembled on the surface of GO-NH 3 + with electrostatic interaction. The study demonstrated that the interaction between GNC@Lys and GNC@BSA increases fluorescence intensity of the GNC@BSA and leads to more sensitive fluorescence response towards Hg2+, for which the sensitivity is more than 3-fold that of single GNC@BSA. The interaction between GO and GNCs accelerates the reaction of D-GNCs/GO with Hg2+, for which the reaction rate is more than 3-fold that of single D-GNCs. Owing to prominent synergistic effects between GNC@Lys, GNC@BSA and GO, the nanosensor based on the D-GNCs/GO displays a surprisingly enhanced sensitivity and rapidity for Hg2+ detection. The fluorescence peak intensity linearly decreases with increasing Hg2+ concentration in the range of 1.0 × 10-5 to 5.0 × 10 -13 M with a detection limit of 1.8 × 10-13 M (S/N = 3). The analytical method presents an obvious advantage of sensitivity, rapidity and repeatability when compared with present Hg2+ optical sensors. It has been successfully applied to detection of Hg2+ in water samples. The study also opens a new avenue for fabrication of fluorescent hybrids, which holds great potential applications in sensing, spectral encoding, bioimaging and catalysis. © 2014 the Partner Organisations.


Ruiyi L.,Jiangnan University | Juanjuan Z.,Jiangnan University | Zhouping W.,Jiangnan University | Zaijun L.,Jiangnan University | And 4 more authors.
Sensors and Actuators, B: Chemical | Year: 2015

Graphene-gold nanohybrids have become a hot research topic in material science, because the hybridization can be an effective strategy to enhance the functionality of materials and the integration of nanomaterials on graphene nanosheets potentially paves a new way to improve their electronic, chemical and electrochemical properties. The study reported a novel graphene-gold nanohybrid with excellent electrocatalytic performance for electrochemical detection of glucose. First, the monodisperse gold nanoparticles (GNs) were prepared via the citrate reduction associated with pH-shifting. The resulting GNs give an average particle size of 6 nm and narrow size distribution. Then, one part of the GN solution was mixed wikth the graphite oxide solution, which followed by the ascorbic acid reduction and unidirectional freeze-drying to prepare graphene aerogel@GNs (GA@GNs). The formed GA@GNs offers a well-defined three-dimensional and orientated porous structure. In addition, the most of GNs in the aerogel was embedded in the intertwined graphene sheets. Finally, another part of the GN solution was sucked into the GA@GNs to obtain GA@GNs/GNs. It was subjected to freeze-drying and thermal annealing in air at 180°C to remove the citrate modified on the surface of GNs. Because their active sites were well exposed outside, the adsorbed GNs are of high catalytic activity. The study shows that the asprepared GA@GNs/GNs gives high electrical conductivity (15.4 S m-1), specific surface area (291.6 m2 g-1) and apparent heterogeneous electron transfer rate constant (14.8 ± 0.12 cm s-1). The sensor based on the GA@GNs/GNs displays ultrasensitive electrochemical response to glucose, owing to largely enhanced electron transfer, mass transport and catalytic activity. Its peak current linearly increases with the increase of glucose in the range from 0.01 to 16 mM with the detection limit of 0.004 mM (S/N = 3). The analytical method presents the advantage of sensitivity, repeatability and stability compared with present glucose sensors. It has been successfully applied in the detection of glucose in serum samples with the spiked recovery of 95.7-104.2%. The study also provides a promising approach for building on various graphene-metal nanohybrids with excellent electrochemical performance for sensing, catalysis and energy storage/conversion devices. © 2014 Elsevier B.V. All rights reserved.


Ruiyi L.,Jiangnan University | Ling L.,Jiangnan University | Hongxia B.,Jiangnan University | Zaijun L.,Jiangnan University | Zaijun L.,Key Laboratory of Food Colloids and Biotechnology
Biosensors and Bioelectronics | Year: 2016

Graphene aerogel has attracted increasing attention due to its large specific surface area, high-conductivity and electronic interaction. The paper reported a facile synthesis of nitrogen-doped multiple graphene aerogel/gold nanostar (termed as N-doped MGA/GNS) and its use as the electrochemical sensing platform for detection of double stranded (dsDNA). On the one hand, the N-doped MGA offers a much better electrochemical performance compared with classical graphene aerogel. Interestingly, the performance can be enhanced by only increasing the cycle number of graphene oxide gelation. On the other hand, the hybridization with GNS further enhances the electrocatalytic activity towards Fe(CN)63-/4-. In addition, the N-doped MGA/GNS provides a well-defined three-dimensional architecture. The unique structure make it is easy to combine with dsDNA to form the electroactive bioconjugate. The integration not only triggers an ultrafast DNA electron and charge transfer, but also realizes a significant synergy between N-doped MGA, GNS and dsDNA. As a result, the electrochemical sensor based on the hybrid exhibits highly sensitive differential pulse voltammetric response (DPV) towards dsDNA. The DPV signal linearly increases with the increase of dsDNA concentration in the range from 1.0×10- 21gml- 1 to 1.0×10-16gml-1 with the detection limit of 3.9×10-22gml-1 (S/N=3). The sensitivity is much more than that of all reported DNA sensors. The analytical method was successfully applied in the electrochemical detection of circulating free DNA in human serum. The study also opens a window on the electrical properties of multiple graphene aerogel and DNA as well their hybrids to meet the needs of further applications as special nanoelectronics in molecule diagnosis, bioanalysis and catalysis. © 2015 Elsevier B.V.


Tao Y.,Jiangnan University | Ruiyi L.,Jiangnan University | Zaijun Li.,Jiangnan University | Zaijun Li.,Key Laboratory of Food Colloids and Biotechnology
Materials Letters | Year: 2016

The microwave approach along with hydrothermal treatment was used for the fabrication of NiCo2S4 for high-performance supercapacitors. The as-fabricated NiCo2S4 shows a three-dimensional structure with tremella-like morphology. The unique architecture creates an ultra-fast electron transfer and electrolyte transport during the electrochemical reaction. The NiCo2S4 electrode delivers a high specific capacitance of 1410.7 F/g at 1 A/g. The capacitance retention reaches 92.7% at 20 A/g after 3000 cycles. © 2016 Elsevier B.V. All rights reserved.

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