Highly Tunable Charge Transport in Layer-by-Layer Assembled Graphene Transistors

Hwang, Hyunmin; Joo, Piljae; Kang, Moon Sung; Ahn, Gukmoon; Han, Joong Tark; Kim, Byeong Su; Cho, Jeong Ho

doi:10.1021/nn2047197

Cited by 83 publications

(70 citation statements)

References 56 publications

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“…The UV-Vis spectra exhibited a maximum absorption peak at 217 nm as displayed in Figure 1(c), which is consistent with the previous results. 16 The absorbance at the peak increases gradually with increasing number of layers, indicating that the LbL assembly was successfully achieved.…”

Section: Notesmentioning

confidence: 90%

Impedimetric Hg²⁺Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Park¹,

Kim²,

Haque³

et al. 2012

Bulletin of the Korean Chemical Society

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Recent efforts toward the development of electrochemical biosensors have emphasized the incorporation of nanomaterials, such as carbon nanotubes, metal nanoparticles, and graphene into the electrode. This incorporation, particularly of graphene, significantly improves the sensor sensitivity and selectivity.1,2 Graphene, a single-atom-thick twodimensional sp 2 carbon network material, serves as a good support for biomolecules due to its flat surface, large surface area, and rich π-conjugation structure.3-7 The combination of graphene and DNA has attracted much interest in the biosensor field. Recently, the interaction between hairpin DNA (hp-DNA) and graphene surface have been used to detect single nucleotide polymorphisms (SNP).5,8 Hp-DNA is a secondary DNA structure in which two regions of the same DNA strand form base-pairs in a double helix capped by an unpaired loop. The presence of the unpaired loop permits hp-DNA to readily adsorb onto graphene surfaces.The development of efficient methods for detection of trace Hg 2+ is of significant importance for human health and the environment because Hg 2+ is an extremely toxic heavy metal ion. Numerous strategies including optical and electrochemical methods for the detection of Hg 2+ have been developed.9 Among them, electrochemical impedance spectroscopy (EIS) as a label-free method, is highly attractive for biosensing assay due to its high sensitivity and simplicity. 10Herein, we report an Hg 2+ detection on the reduced graphene oxide (RGO) surfaces modified with hp-DNA using EIS. The RGO-modified electrode surface was prepared by the chemical reduction of layer-by-layer (LbL) assembled graphene oxide (GO) and polyethyleneimine (PEI). The hp-DNA used here as the probe DNA included a loop region containing several thymine bases. The hp-DNA was immobilized onto the RGO-modified indium-tin-oxide (ITO) electrode surface. Hg 2+ may be captured between thyminethymine (T-T) mismatched base pairs to form a duplex structure stabilized by covalent bonds between Hg 2+ and the thymine residues (T-Hg11 which results in removal of hp-DNA from graphene surface, as shown in Figure 1(a).EIS was used to monitor the interfacial changes in the electrode surface after exposure to an Hg 2+ solution. The charge transfer resistance of a redox couple was recorded using the RGO-modified ITO electrode surface after exposure to the probe hp-DNA and the subsequent interactions with Hg 2+ in the buffer solution. To the best of our knowledge, this is the first report of using RGO-modified surface for the electrochemical impedimetric detection of Hg 2+. Furthermore, Hg 2+ detection using hairpin DNA immobilized on the RGOmodified electrode surface has never been reported.GO was observed by atomic force microscopy ( Figure 1(b)), which confirms that individual single-layer GO sheets with a thickness of ~1 nm. GO is readily dispersed in water due to its intrinsic oxygen-containing groups, including phenol, carbonyl, and epoxide groups.12 The presence of these groups enables the easy adsorption ...

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Section: Notesmentioning

confidence: 90%

Impedimetric Hg²⁺Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Park¹,

Kim²,

Haque³

et al. 2012

Bulletin of the Korean Chemical Society

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“…2019, 14,2553 -2566 www.chemasianj.org cantly expanding the LbL toolkit. [77][78][79][80] Various organic compounds/GOhybrid materials have been createdbyusing physiochemical approaches, thereby improving the processability of these materials in different solvents and utilizing the outstanding properties of the attached molecules. [81] Aw ide range of organic compounds, including aromatic dyes, ionic liquids,a nd pyrene derivatives, have also been anchored onto GO nanosheets,either in ac ovalent or noncovalent manner, for applications in catalysis, electronic devices, and solar cells.…”

Section: Lbl Assembly:acase Study Of Graphene Oxidementioning

confidence: 99%

Layer‐by‐Layer Assembly: Recent Progress from Layered Assemblies to Layered Nanoarchitectonics

Ariga

Ahn

Park

et al. 2019

Chemistry An Asian Journal

133

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As an emerging concept for the development of new materials with nanoscale features, nanoarchitectonics has received significant recent attention.A mongt he various approaches that have been developed in this area, the fixeddirection construction of functional materials, such as layered fabrication, offers ah elpful starting point to demonstrate the huge potentialo fn anoarchitectonics. In particular, the combination of nanoarchitectonics with layer-by-layer (LbL) assembly and al arge degree of freedomi nc omponent availability and technical applicability would offer significant benefits to the fabrication of functional materials. In this Minireview,r ecent progress in LbL assembly is briefly summarized. After introducing the basicso fL bL assembly,r ecent advances in LbL research are discussed, categorized according to physical, chemical, and biological innovations, along with the fabrication of hierarchical structures.E xamples of LbL assemblies with graphene oxide are also described to demonstrate the broad applicability of LbL assembly,e ven with afixed material.Scheme1.Outline of the nanoarchitectonics concept:afusion of nanotechnology and the other research fields, the harmonization of various actions, and the conversion of simple self-assemblyinto hierarchical structures.

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“…Figure 4B shows high-resolution C1s spectrum of CDs. After further fitting, it can separated into carbon skeleton O═C─O, C─O, C─N, C─H, and C─C combination states, corresponding to electron energy of 289.1, 286.3, 285.6, and 284.7 eV, 32 respectively. Figure 4C is the high-resolution O1s XPS spectrum of CDs.…”

Section: Structure Of Ag/cdsmentioning

confidence: 99%

Preparation and photocatalytic CO₂ reduction performance of silver nanoparticles coated with coal-based carbon dots

et al. 2018

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Summary Currently, the best approach to solve the increasing CO2 emission and energy shortage problems comes from catalytic CO2 reduction into organic fuels using solar radiation. Using inexpensive coal samples, here we synthesized coal‐based luminescent carbon dots (CDs) by H2O2 oxidation method. Coated composite nanoparticle Ag/CDs were then fabricated using a simple silver mirror reaction to attach CDs in situ to Ag surface. The lattice structure of Ag/CDs was characterized, and the performance of photocatalytic CO2 reduction into hydrocarbons was investigated. The surface of the composite contains a large number of oxygen groups and mesoporous interface from accumulation of uniform‐sized particles, demonstrating good adsorption capability for CO2. Thanks to the broad absorption spectra extending into the visible range and low recombination rate of photogenerated electron‐hole pairs, the composite nanoparticles can be applied in the photocatalytic CO2 reduction. Compared with individual Ag and CDs, Ag/CDs exhibit enhanced photocatalytic activity for CO2 reduction.

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Highly Tunable Charge Transport in Layer-by-Layer Assembled Graphene Transistors

Cited by 83 publications

References 56 publications

Impedimetric Hg²⁺Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Impedimetric Hg²⁺Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Layer‐by‐Layer Assembly: Recent Progress from Layered Assemblies to Layered Nanoarchitectonics

Preparation and photocatalytic CO₂ reduction performance of silver nanoparticles coated with coal-based carbon dots

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Highly Tunable Charge Transport in Layer-by-Layer Assembled Graphene Transistors

Cited by 83 publications

References 56 publications

Impedimetric Hg2+Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Impedimetric Hg2+Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Layer‐by‐Layer Assembly: Recent Progress from Layered Assemblies to Layered Nanoarchitectonics

Preparation and photocatalytic CO2 reduction performance of silver nanoparticles coated with coal-based carbon dots

Contact Info

Product

Resources

About

Impedimetric Hg²⁺Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Impedimetric Hg²⁺Detection on Multilayered Reduced Graphene Oxide-Modified Electrode

Preparation and photocatalytic CO₂ reduction performance of silver nanoparticles coated with coal-based carbon dots