Processable aqueous dispersions of graphene nanosheets

Li, Dan; Müller, Marc B.; Gilje, Scott; Kaner, Richard B.; Wallace, Gordon G.

doi:10.1038/nnano.2007.451

Cited by 8,582 publications

(5,668 citation statements)

References 31 publications

Supporting

253

Mentioning

5,238

Contrasting

Unclassified

Order By: Relevance

“…The basic characteristics of GO are presented in Figure S5, Supporting Information. The height of GO and the Raman spectra of GO we obtained were consistent with the previous studies 26. The amyloid peptide was incubated for 8 h at 37 °C with GO, and finally the complex was obtained.…”

Section: Resultssupporting

confidence: 89%

Identification of a Novel Parallel β‐Strand Conformation within Molecular Monolayer of Amyloid Peptide

Liu

Zhang

et al. 2016

Advanced Science

View full text Add to dashboard Cite

The differentiation of protein properties and biological functions arises from the variation in the primary and secondary structure. Specifically, in abnormal assemblies of protein, such as amyloid peptide, the secondary structure is closely correlated with the stable ensemble and the cytotoxicity. In this work, the early Aβ33‐42 aggregates forming the molecular monolayer at hydrophobic interface are investigated. The molecular monolayer of amyloid peptide Aβ33‐42 consisting of novel parallel β‐strand‐like structure is further revealed by means of a quantitative nanomechanical spectroscopy technique with force controlled in pico‐Newton range, combining with molecular dynamic simulation. The identified parallel β‐strand‐like structure of molecular monolayer is distinct from the antiparallel β‐strand structure of Aβ33‐42 amyloid fibril. This finding enriches the molecular structures of amyloid peptide aggregation, which could be closely related to the pathogenesis of amyloid disease.

show abstract

Section: Resultssupporting

confidence: 89%

Identification of a Novel Parallel β‐Strand Conformation within Molecular Monolayer of Amyloid Peptide

Liu

Zhang

et al. 2016

Advanced Science

View full text Add to dashboard Cite

show abstract

“…Significantly, our RGO Na-NH3 sample shows a lowest oxygen percentage (5.62 wt%) and nitrogen percentage (0.86 wt%). Our ARTICLE products are quite distinct from all the other RGOs, such as a hydrazine reduction product (oxygen wt% 11.57%, nitrogen wt% 3.78%) 31 (Supplementary Table S1). …”

Section: Resultsmentioning

confidence: 86%

A low-temperature method to produce highly reduced graphene oxide

et al. 2013

View full text Add to dashboard Cite

Chemical reduction of graphene oxide can be used to produce large quantities of reduced graphene oxide for potential application in electronics, optoelectronics, composite materials and energy-storage devices. Here we report a highly efficient one-pot reduction of graphene oxide using a sodium-ammonia solution as the reducing agent. The solvated electrons in sodium-ammonia solution can effectively facilitate the de-oxygenation of graphene oxide and the restoration of p-conjugation to produce reduced graphene oxide samples with an oxygen content of 5.6 wt%. Electrical characterization of single reduced graphene oxide flakes demonstrates a high hole mobility of 123 cm 2 Vs À 1 . In addition, we show that the pre-formed graphene oxide thin film can be directly reduced to form reduced graphene oxide film with a combined low sheet resistance (B350 O per square with B80% transmittance). Our study demonstrates a new, low-temperature solution processing approach to high-quality graphene materials with lowest sheet resistance and highest carrier mobility.

show abstract

“…Preparation of graphene oxide [27] Graphene oxide was prepared from graphite powder (Alfa Aesar, 200 mesh) according to a modified Hummers' method. In more detail, graphite powder (0.5 g) was placed into a mixture of sulfuric acid (40 mL, 98 %) and sodium nitrate (0.375 g).…”

Section: Methodsmentioning

confidence: 99%

Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells

et al. 2016

View full text Add to dashboard Cite

In this work we systematically investigated the role of reduced graphene oxide (rGO) in hybrid perovskite solar cells (PSCs). By mixing rGO within the mesoporous TiO 2 (m-TiO 2 ) matrix, highly efficient solar cells with power conversion efficiency values up to 19.54 % were realized. In addition, the boosted beneficial role of rGO with and without Li-treated m-TiO 2 is highlighted, improving transport and injection of photoexcited electrons. This combined system may pave the way for further development and optimization of electron transport and collection in high efficiency PSCs.Since its isolation in 2004, [1] graphene has had a huge impact on applications in optoelectronic and photon energy conversion, owing to its unique electronic, optical, and mechanical properties. [2][3][4][5] The development of solution-processable graphene, such as the chemical exfoliation of graphite into graphene oxide, allowed the functionalization and processing of graphene, extending its use in the different layers of solutionprocessable solar cells. [6,7] Among different solar cell technologies, organic-inorganic hybrid perovskite solar cells (PSCs) have been dominating the interest of the scientific research community for their impressive technological development with power conversion efficiency (PCE) values beyond 22 % in a short of six years of research. [8] However, further improvements are necessary to optimize the PSC device operation and stability, and enhance the device performance. From this point, mixed graphene-based derivatives have been proposed to further enhance the device properties. [7] Used in various forms and with different functionalities, either incorporated in mesoscopic or in planar device configuration, [9,10] functionalized reduced graphene oxide (rGO) derivatives have been successfully employed for improved charge extraction in the electrontransport material (ETM) [9,11,12] or hole-transport material (HTM) [13] in PSCs. Its ability to effectively reduce the chargerecombination pathways and decrease the leakage currents has been demonstrated, with a similar role as in organic solar cells. [14][15][16] However, all of the PCEs reported are limited to less than 14 % and the perovskite was not formed as a perfect film, which casts the doubt on the real beneficial role of rGO on high-efficiency PSCs. In contrast to many applications of carbon-based materials that are usually introduced at the perovskite/TiO 2 or perovskite/HTM interfaces, or in substitution of the HTM itself, [17,18] here we propose a systematic study by exploring three different configurations as shown in Figure 1.We integrated the rGO: 1) in the 2,2',7,7'-tetrakis(N,N'-di-pmethoxyphenylamine)-9,9'-spirobifluorene (spiro-OMeTAD) HTM, 2) in the matrix of the active perovskite layer, and 3) within the mesoporous TiO 2 (m-TiO 2 ) ETM. In this study, mesoscopic PSCs are composed of a fluorine doped tin oxide (FTO)-coated glass substrate, a compact TiO 2 layer followed by a m-TiO 2 layer, a mixed (FAPbI 3 ) 0.85 (MAPbBr 3 ) 0.15 (FA = formamidin...

show abstract

Processable aqueous dispersions of graphene nanosheets

Cited by 8,582 publications

References 31 publications

Identification of a Novel Parallel β‐Strand Conformation within Molecular Monolayer of Amyloid Peptide

Identification of a Novel Parallel β‐Strand Conformation within Molecular Monolayer of Amyloid Peptide

A low-temperature method to produce highly reduced graphene oxide

Beneficial Role of Reduced Graphene Oxide for Electron Extraction in Highly Efficient Perovskite Solar Cells

Contact Info

Product

Resources

About