On the charge transfer between single-walled carbon nanotubes and graphene

Rao, Rahul; Pierce, Neal; Dasgupta, Archi

doi:10.1063/1.4893698

Cited by 26 publications

(20 citation statements)

References 27 publications

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“…cm −1 , respectively (Liu et al, 2017), as shown in Figure 4B. The downshift of several wavenumbers indicates electron transfer from Fe 3 O 4 nanospheres to 3D RGO, as illustrated in the literature (Rao et al, 2014;Hu et al, 2018b). This also confirms the formation of heterostructures between RGO and Fe 3 O 4 in Fe 3 O 4 @RGO.…”

Section: Microstructure Characterizationssupporting

confidence: 75%

Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors

Zou

et al. 2019

Front. Mater.

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Metal oxide/reduced graphene oxide (RGO) heterojunctions have been widely used to fabricate room-temperature gas sensors due to large specific surface areas of RGO nanosheets and enhanced carrier separation efficiency at the interface. However, the sheet stacking of RGO nanosheets limits the full utilization of metal oxide/RGO heterojunctions. Herein, we demonstrate a high-performance room-temperature NO 2 gas sensor based on 3D Fe 3 O 4 @RGO p-n heterojunctions with a core-shell structure, which were synthesized by self-assembly method and further reduction. The effects of different Fe 3 O 4 /RGO ratios and the relative humidity on the sensing performances have been investigated. The experimental results suggest that the 3D Fe 3 O 4 @RGO sensor exhibits a good selectivity and high sensitivity of 183.1% for 50 ppm NO 2 , which is about 8.17 times higher than that of the pure 2D RGO sensor. When exposed to 50 ppb of NO 2 , the response value still reaches 17.8%. This enhanced sensing performance is mainly ascribed to the formed heterojunctions and the larger surface area of RGO nanosheets. This 2D to 3D heterostructure strategy provides a general route to fabricating ultrahigh-performance room-temperature RGO-based gas sensors.

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Section: Microstructure Characterizationssupporting

confidence: 75%

Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors

Zou

et al. 2019

Front. Mater.

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“…Upon contact with semiconducting CNTs, the G‐peak of graphene is positively shifted by ≈10 cm −1 , implying p‐type doping of the graphene. Doping of graphene would be caused by hole transfer from CNTs to graphene …”

Section: Resultsmentioning

confidence: 99%

“…The scanning electron microscope (SEM) image in Figure 3a presents the boundary between the PET substrate and the graphene electrode of the fabricated sensor, which indicates that the graphene is clearly defined, and the CNTs are uniformly dispersed over the entire area without aggregation. [34] Figure 4a shows an optical image of the fabricated UV sensor, which demonstrates that all components of the device are fully transparent. We also measured the Raman spectra of CNT, graphene, and a CNT-graphene hybrid with 532 nm laser excitation.…”

Section: Wwwadvelectronicmatdementioning

confidence: 99%

A Fully Transparent, Flexible, Sensitive, and Visible‐Blind Ultraviolet Sensor Based on Carbon Nanotube–Graphene Hybrid

Pyo

Choi

Kim

2018

Adv Elect Materials

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generates free-radical chemical species that cause various skin diseases such as inflammatory disorders, aging, and skin cancer. [2] With recent advances in smart health care technology, the demand for transparent and flexible UV sensors that can be integrated into portable or wearable devices is rapidly growing for numerous potential applications, including smart watches/bands, smart glasses, and patchable devices. [3][4][5] However, Si-based UV sensors, the most established commercial sensors, are unsuitable for use in such applications because of their lack of mechanical flexibility and optical transparency and their need for high operating voltage and a long-pass filter to block low energy photons. [6] To overcome these shortcomings, nanomaterial-based UV sensors have been extensively studied. [7][8][9][10] 1D and 2D semiconducting materials such as ZnO, TiO 2 , GaTe, and MoS 2 are promising candidates for photodetection because of their direct bandgap at room temperature, transparency in the visible region, and mechanical flexibility. [11][12][13][14] Accordingly, those materials have been used for the active component of sensitive, transparent, and flexible UV sensors. [15][16][17][18][19] The UV sensors based on nanomaterials generally show high-performance in terms of photoresponsivity and response/recovery time, but most of them still rely on intrinsically opaque metal electrodes. [15,16] Although a few works have reported UV sensors where all the active or passive components were transparent, [17,18] the brittle electrode (e.g., indium tin oxide; ITO) limits the flexibility of the sensor, since ITO easily fractures under a strain of only 1%. [20] To achieve both optical transparency and mechanical flexibility, all the components of the UV sensor must be transparent and flexible. In addition, contact resistance between the photoactive material and the electrodes is a significant factor influencing the performance of UV sensors and must be considered in order to induce an effective charge transfer from the photoactive material to the electrodes. [21,22] This implies that selection of both photoresponsive and electrode materials would regulate the overall photoresponse as well as transparency and flexibility of the UV sensor.One of the promising alternatives is a combination of carbon nanomaterials, including 1D carbon nanotubes (CNTs) and

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“…Variations in the electronic structure of SWNTs have previously been reported when in contact with graphene nanoribbons. 20 A few experimental studies have [21][22][23] addressed the shis in the Raman mode frequencies of SWNTs and SLG in the hybrid system and it was claimed that the shis occur as a consequence of charge transfer between the two at the heterojunction. In these studies, the charge transfer between SWNTs and SLG, responsible for the Raman peak shis, is ascribed to the work-function difference between these structures and any other atomic interaction between the two components is not taken into account.…”

Section: Introductionmentioning

confidence: 99%

Tight-binding investigation of the structural and vibrational properties of graphene–single wall carbon nanotube junctions

Srivastava

Gaur

2021

Nanoscale Adv.

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On the charge transfer between single-walled carbon nanotubes and graphene

Cited by 26 publications

References 27 publications

Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors

Three-Dimensional Fe3O4@Reduced Graphene Oxide Heterojunctions for High-Performance Room-Temperature NO2 Sensors

A Fully Transparent, Flexible, Sensitive, and Visible‐Blind Ultraviolet Sensor Based on Carbon Nanotube–Graphene Hybrid

Tight-binding investigation of the structural and vibrational properties of graphene–single wall carbon nanotube junctions

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