Photoreduction of graphene oxide with polyoxometalate clusters and its enhanced saturable absorption

Li, Haolong; Gupta, Jyotsana; Wang, Shan; Zhang, Na; Bubeck, Christoph

doi:10.1016/j.jcis.2013.11.030

Cited by 21 publications

(9 citation statements)

References 43 publications

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“…[ 73 ] Applying GO modifi cations with laser-assisted fabrications, nanostructures can be created in graphene membranes on polymer fi lms. [ 74 ] As mentioned previously, the laser beam deposits heat locally and, in this manner, irradiated polymer instantaneously melts and vaporizes. In such a way, a singlelayer graphene membrane can adhere to the polymer surface and consequently form ≈10 nm deep wells during such a laser drilling of the polymer.…”

Section: Film Structuring and Patterningmentioning

confidence: 86%

“…In such a way, a singlelayer graphene membrane can adhere to the polymer surface and consequently form ≈10 nm deep wells during such a laser drilling of the polymer. Li et al [ 74 ] found out that, due to the short timescale of laser irradiation, heat diffusion into the polymer was negligible, and the excitation energy was highly confi ned in the polymer. A 532 nm laser with a repetition rate of 10 Hz and a pulse duration τ FWHM of 25±2 ps was used in experiments.…”

Section: Film Structuring and Patterningmentioning

confidence: 99%

“…The authors concluded that the LUMO levels of POMs should be located energetically above the work function of GO to enable electron transfer from POM to GO. [ 74 ] Hence, this was not a disadvantage since the modifi cation of non-reduced GO also improved the photocatalytic properties, allowing it to be employed in practical applications.…”

Section: Laser-induced Decoration Of Graphene With Inorganic Elementsmentioning

confidence: 99%

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Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Trusovas

Račiukaitis

Niaura

et al. 2015

Advanced Optical Materials

161

110

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the manipulation of graphene and its derivatives occupy a relatively insignifi cant part, i.e., less than 1%. The fi rst publications on graphene modifi cation with laser irradiation appeared in 2008, however, since 2010, the number of publications has risen exponentially.Graphene oxide (GO) has emerged as a versatile material for nanocarbon research. Several types of oxygen-containing functional groups present on the basal plane, and the sheet edge allows GO to interact with a broad range of organic and inorganic materials. [ 9 ] Furthermore, GO is an abundant and low-cost material synthesized from graphite or graphite oxide; it retains a layered structure but, at the same time, it can be characterized by the loss of electronic conjugation caused by the oxy groups at the edge or plane defects. GO has a potential use in energy, [ 10 ] electronics, [ 11 ] molecular sensing areas, [ 12 ] catalysis, [ 13 ] etc. Moreover, it can be reduced chemically or thermally in order to achieve graphenelike properties. [ 14 ] The material produced during such a procedure is usually referred to as "reduced GO" (rGO). However, residual defects such as remnant oxygen atoms, [ 15 ] Stone-Wales defects (pentagon-heptagon pairs), [ 16 ] and holes [ 17 ] appearing due to the loss of carbon (in the form of CO or CO 2 ) from the basal plane [ 18 ] limit the electronic quality of rGO.A laser is a powerful tool which is used for various applications in industry, medicine, science, and material processing. [ 19 ] It is usually employed in different processes such as ablation, etching, cutting of various materials, as well as direct A dramatic rise in research interest in laser-induced graphene oxide (GO) reduction and modifi cation requires an overview of the most recent works on this subject. Typical methods for the recognition and confi rmation of modifi ed graphene and its derivatives, such as Raman, Fourier-transform infra-red (FTIR), X-ray photoelectron (XP), and ultraviolet-visible (UV-vis) spectroscopies, are introduced briefl y in this review. A major part of the survey is devoted to the main modifi cation ways and the laser parameters used in the literature. A discussion of possible reduction and modifi cation mechanisms is also presented. Recent applications, especially in the biomedical fi eld such as cell therapy treatment, as well as signifi cant results of GO modifi cation, are discussed in detail. Finally, perspectives for the application of laser-induced GO modifi cations in passive THz photonics and biomedicine are briefl y addressed.

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Section: Film Structuring and Patterningmentioning

confidence: 86%

Section: Film Structuring and Patterningmentioning

confidence: 99%

Section: Laser-induced Decoration Of Graphene With Inorganic Elementsmentioning

confidence: 99%

See 1 more Smart Citation

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Trusovas

Račiukaitis

Niaura

et al. 2015

Advanced Optical Materials

161

110

View full text Add to dashboard Cite

show abstract

“…10,000 cm 2 V −1 s −1 ) and large theoretical surface area (2600 m 2 g −1 ) [32][33][34]. Therefore, the combination of graphene with semiconductors can not only inhibit the recombination of the photogenerated electron-hole pairs, but also adjust the band gap of photocatalysts and provide more photoactive sites [35][36][37]. More importantly, functionalization of N-doped graphene is a good way to improve the photocatalytic behavior.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photocatalytic Hydrogen Production of the Polyoxoniobate Modified with RGO and PPy

Heng

et al. 2020

Nanomaterials

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The development of high-efficiency, recyclable, and inexpensive photocatalysts for water splitting for hydrogen production is of great significance to the application of solar energy. Herein, a series of graphene-decorated polyoxoniobate photocatalysts Nb6/PPy-RGO (Nb6 = K7HNb6O19, RGO = reduced graphene oxide, PPy = polypyrrole), with the bridging effect of polypyrrole were prepared through a simple one-step solvothermal method, which is the first example of polyoxoniobate-graphene-based nanocomposites. The as-fabricated photocatalyst showed a photocatalytic H2 evolution activity without any co-catalyst. The rate of 1038 µmol g−1 in 5 h under optimal condition is almost 43 times higher than that of pure K7HNb6O19·13H2O. The influencing factors for photocatalysts in photocatalytic hydrogen production under simulated sunlight were studied in detail and the feasible mechanism is presented in this paper. These results demonstrate that Nb6O19 acts as the main catalyst and electron donor, RGO provides active sites, and PPy acted as an electronic bridge to extend the lifetime of photo-generated carriers, which are crucial factors for photocatalytic H2 production.

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“…SMZ*, HD-SMZ and AD-SMZ represent possible products coming from EC processes and will be discussed later in more detail. The grey region defines the energy range associated with the work function of graphene-based electrodes [32] and the dashed line illustrates an estimation of the work function of our composite electrode, W GC/rGO-AuNPs (obtained from Fig. 4).…”

Section: Molecular Modelling Studiesmentioning

confidence: 99%

Electrochemical oxidation of sulfamethazine on a glassy carbon electrode modified with graphene and gold nanoparticles

Cesarino

Simões

Lavarda

et al. 2016

Electrochimica Acta

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This work presents a comprehensive investigation of the oxidation mechanism of sulfamethazine (SMZ) combining electrochemical experiments and molecular modelling techniques. Cyclic voltammetry and differential pulse voltammetry experiments were performed in phosphate buffer solution (PBS) using a glassy carbon (GC) electrode modified with reduced graphene oxide and gold nanoparticles (rGO-AuNPs). Molecular modelling studies were performed via Density Functional Theory (DFT) employing Becke's LYP (B3LYP) exchange-correlation functional and the 6-31G(p,d) basis set. The evaluation of molecular reactivity was accomplished by Condensed-to-Atoms Fukui Indexes (CAFIs). In the theoretical studies, three species were analysed: natural SMZ (SMZ (0)) and its protolytic structures, SMZ (+H) and SMZ (ÀH). The CV results show a well-defined irreversible SMZ oxidation peak at +0.89 V. The molecular modelling studies indicate that SMZ (0) is the species that effectively participates in the oxidation process. Based on the reactivity indexes obtained, two distinct oxidation mechanisms associated with EC processes occurring in the systems were proposed.

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Photoreduction of graphene oxide with polyoxometalate clusters and its enhanced saturable absorption

Cited by 21 publications

References 43 publications

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Recent Advances in Laser Utilization in the Chemical Modification of Graphene Oxide and Its Applications

Enhanced Photocatalytic Hydrogen Production of the Polyoxoniobate Modified with RGO and PPy

Electrochemical oxidation of sulfamethazine on a glassy carbon electrode modified with graphene and gold nanoparticles

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