Efficient Reducing Method of Graphene Oxide for Gas Sensor Applications

Lee, H.-K.; Lee, J.; Choi, Nak-Jin; Moon, Seung Eon; Lee, H.; Yang, Woo Seok

doi:10.1016/j.proeng.2011.12.219

Cited by 12 publications

(3 citation statements)

References 5 publications

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“…Many reported as available on the use of RGO for detecting gas molecules like NH 3 , NO 2 , H 2 , etc. [31][32][33]. These sensors are tested in lower gas concentrations, and they exhibit high sensing response and reversibility at ambient temperature with low power consumptions.…”

Section: Carbon-based Nanosensormentioning

confidence: 99%

Environmental Gas Sensors Based on Nanostructured Thin Films

Sureshkumar¹,

Dutta²

2020

Multilayer Thin Films - Versatile Applications for Materials Engineering

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Since the discovery of electron microscopes, nanomaterials and nanotechnology have been influencing academic and industrial research greatly for bringing out newer and better products with improved materials' properties. In the field of environmental gas sensors too, the demonstration of nanomaterials for sensing various gases has become a common practice. Environmental gas pollution has turned out to be a huge concern in the society due to the progress of civilization. The awareness of health hazard for different toxic/polluting gases and rectification measure by imposing stricter norms has prompted extensive research to develop efficient gas sensors to detect trace level of pollution from various sources. Thin film, ultrathin film, and nanostructure materials of metal oxide semiconductor, polymer, metal, carbon nanotube, graphene, etc. with or without sensitizers have been investigated for sensing various toxic gases. New device structures have been fabricated to achieve high sensitivity, selectivity, fast response, etc. The microstructure and thickness of film are found to influence the performance greatly. Various methods of preparations and mechanism of sensing are being explored. All these aspects and the challenges were discussed in this chapter.

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Section: Carbon-based Nanosensormentioning

confidence: 99%

Environmental Gas Sensors Based on Nanostructured Thin Films

Sureshkumar¹,

Dutta²

2020

Multilayer Thin Films - Versatile Applications for Materials Engineering

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“…Post reaction mixture was purified using hydrochloric acid solution and deionized water. Reduction of GO was carried out by a simple, quick and cost effective method [25,26]. 5 ml of GO water suspension (concentration 10 mg/ml) was diluted with 200 ml of deionized water and 10 ml of 57% concentrated HI was added.…”

mentioning

confidence: 99%

Linearly polarized, Q-switched Er-doped fiber laser based on reduced graphene oxide saturable absorber

Soboń

Sotor

Jagiełło

et al. 2012

Applied Physics Letters

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We demonstrate generation of linearly polarized pulses from a passively Q-switched Erbiumdoped fiber laser. The cavity was designed using only polarization maintaining (PM) fibers and components, resulting in linearly polarized output beam with degree of polarization (DOP) at the level of 97.6%. Reduced graphene oxide (rGO) was used as a saturable absorber for Q-switched operation. The laser was capable of delivering 1.85 µs pulses with 125 nJ pulse energy at 115 kHz repetition rate.Graphene, due to its unique nonlinear optical properties, has been widely used as a saturable absorber (SA) for various types of lasers. Since the demonstration of a mode-locked fiber laser [1], many setups were presented, utilizing erbium-[1-4], ytterbium- [5,6] and thulium-doped fibers [7]. Thanks to the high modulation depth, broad operation range and ultrafast recovery time, graphene may be used to generate ultrashort pulses (e.g. 174 fs [4]) from passively mode-locked lasers. Recently, also passive Q-switching with graphene-SA has been demonstrated [8][9][10][11]. In a passively Q-switched laser, the cavity losses are automatically modulated by the saturable absorber, so there is no need of placing an active component (e.g. acoustooptic modulator) inside the resonator. The repetition rates of such lasers are lower and the pulses are longer in comparison to mode-locked lasers, but the achieved pulse energies usually exceed those which are achievable from mode-locked oscillators. Recent reports have shown the possibility of achieving 40 nJ pulses from graphene Q-switched Er-doped lasers [8]. Nevertheless, all previous reports on graphene Q-switched lasers were related to non-polarization maintaining cavities. Therefore, the polarization state of the output beam was undetermined. Such setups require polarization controllers (PC) placed in the laser cavity in order to induce the pulsed operation. In many practical applications (industrial or scientific) it is extremely important to maintain the linear polarization state of the laser output. In general, the saturable absorption in graphene is a polarization-independent process, which was verified experimentally by Zhang et al. [12]. It means, that graphene-based saturable absorbers may be used in PM cavities with only one, well-defined polarization state, without affecting the saturable absorption. This opens a possibility to generate scalar solitons in mode-locked lasers [13,14] or linearly polarized pulses from Q-switched lasers, with the DOP near to 100%.Up till now, many various methods were used to fabricate graphene saturable absorbers. For example, Bao et. al and Zhang et. al [1,2] demonstrated the usage of chemical vapor deposition (CVD) to synthetize graphene on Ni films. Also mechanical exfoliation of graphene from bulk graphite may lead to efficient fiber laser mode-locking [15]. Wet chemistry offers a wide spectrum of techniques of preparing flake graphene and its derivatives. Among them two methods are most attractive and efficient. The first is direct exfoliation of gra...

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“…Hence, RGO based sensors have been studied in detection of various gaseous species. 108,117,120,121 Illustrating the advantage of RGO, non-reduced, as prepared GO sheets showed no response to NO 2 or NH 3 , indicating negligible change in the electrical transport property of the non-reduced GO. The thermally-reduced GO showed p-type semiconducting behavior in ambient conditions and was responsive to low-concentration NO 2 and NH 3 gases diluted in air at room temperature.…”

Section: Introductionmentioning

confidence: 99%

Editors’ Choice—Critical Review—A Critical Review of Solid State Gas Sensors

Hunter

Akbar

Bhansali

et al. 2020

J. Electrochem. Soc.

132

101

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Solid state gas sensors are a core enabling technology to a range of measurement applications including industrial, safety, and environmental monitoring. The technology associated with solid-state gas sensors has evolved in recent years with advances in materials, and improvements in processing and miniaturization. In this review, we examine the state-of-the-art of solid state gas sensors with the goal of understanding the core technology and approaches, various sensor design methods to provide targeted functionality, and future prospects in the field. The structure, detection mechanism, and sensing properties of several types of solid state gas sensors will be discussed. In particular, electrochemical cells (solid and liquid), impedance/resistance based sensors (metal oxide, polymer, and carbon based structures), and mechanical sensing structures (resonators, cantilevers, and acoustic wave devices) as well as sensor arrays and supporting technologies, are described. Development areas for this field includes increased control of material properties for improved sensor response and durability, increased integration and miniaturization, and new material systems, including nano-materials and nano-structures, to address shortcomings of existing solid state gas sensors.

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Efficient Reducing Method of Graphene Oxide for Gas Sensor Applications

Cited by 12 publications

References 5 publications

Environmental Gas Sensors Based on Nanostructured Thin Films

Environmental Gas Sensors Based on Nanostructured Thin Films

Linearly polarized, Q-switched Er-doped fiber laser based on reduced graphene oxide saturable absorber

Editors’ Choice—Critical Review—A Critical Review of Solid State Gas Sensors

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