A new approach to flexible humidity sensors using graphene quantum dots

Hosseini, Zahra; zad, Azam Iraji; Ghiass, Mohammad Adel; Fardindoost, Somayeh; Hatamie, Shadie

doi:10.1039/c7tc01740e

Cited by 53 publications

(40 citation statements)

References 43 publications

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“…The sensor showed an exponential dependence of sensitivity with the RH in the range of 15–80%, and a fast response time estimated at around 5 s. The capillary condensation of water molecules on the GQD surfaces accounted for the sensing performance. Then, Alizadeh et al prepared a GQD humidity sensor by using a similar approach [151], which exhibited outstanding sensitivity to the variation of environment humidity with a response time of about 10 s. However, they found there were two different sensing mechanisms existing between 0–52% and 52–97%. In the low RH range, the adsorption of water molecules increased the hole-type carriers, thus decreasing the electrical resistance, while in the high RH range, the improved ionic proton transportation devoted by the adsorbed water molecules induced the resistance decrease of the sensor.…”

Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

“…The sensor showed an exponential behavior response towards humidity in the RH range of 12–100%, with a response and recovery time of 12 and 43 s, respectively (Figure 13c). The device exhibited a fast response when exposed to a flow of exhaled breath with about 90% RH (Figure 13d) [151]. From the performance summary in Table 3, it can be found that GQDs-based humidity sensors have some advantages, such as high response, high selectivity, and relatively fast response and recovery.…”

Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

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Recent Advances in Graphene-Based Humidity Sensors

Luo

et al. 2019

Nanomaterials

164

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Humidity sensors are a common, but important type of sensors in our daily life and industrial processing. Graphene and graphene-based materials have shown great potential for detecting humidity due to their ultrahigh specific surface areas, extremely high electron mobility at room temperature, and low electrical noise due to the quality of its crystal lattice and its very high electrical conductivity. However, there are still no specific reviews on the progresses of graphene-based humidity sensors. This review focuses on the recent advances in graphene-based humidity sensors, starting from an introduction on the preparation and properties of graphene materials and the sensing mechanisms of seven types of commonly studied graphene-based humidity sensors, and mainly summarizes the recent advances in the preparation and performance of humidity sensors based on pristine graphene, graphene oxide, reduced graphene oxide, graphene quantum dots, and a wide variety of graphene based composite materials, including chemical modification, polymer, metal, metal oxide, and other 2D materials. The remaining challenges along with future trends in high-performance graphene-based humidity sensors are also discussed.

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Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

Section: Humidity Sensors Based On Graphene Materialsmentioning

confidence: 99%

Recent Advances in Graphene-Based Humidity Sensors

Luo

et al. 2019

Nanomaterials

164

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“…Compared with other films for humidity sensing, the as‐fabricated GOA film possessed competitive ultrafast response time in a thicker case, which had more space to improve responsiveness. It can be observed that the response time decreased with decreased thickness for the same type materials, such as the GO‐based films (pink dotted line) and rGO‐based films (blue dotted line) in the figure . In the ultrafast response region marked as yellow, there were three films with the response time smaller than 100 ms. GOA film can maintain ultrafast response at 140 μm thickness, whereas other two films holding ultrafast response were limited to a thickness less than 1 μm.…”

Section: Resultsmentioning

confidence: 91%

Ultrafast‐Response Humidity Sensor with High Humidity Durability Based on a Freestanding Film of Graphene Oxide Supramolecular

Tang

Zhang

et al. 2019

Physica Status Solidi (a)

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Humidity sensors with ultrafast response and recovery speed are highly desired in applications of dynamic situations, such as medical monitoring and industrial detection. A freestanding film for humidity sensing with ultrafast response is easily fabricated by supramolecular polymerization of graphene oxide and aniline (GOA). Its response/recovery time is as short as about 50 ms. The high-speed adsorption and desorption of water vapor on the surface of GOA benefit from the unique moderate hydrophobic surface caused by the hydrophilicity of the oxygencontaining functional group and the hydrophobicity of the benzene ring. Furthermore, the GOA sensor can work at high humidity and recover rapidly from full-water condition. Such ultrafast response and excellent water-durable property of GOA film facilitate the application for physiological or psychological monitoring by detecting humidity fluctuations of human body in real time.

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“…Preparation of graphene: GO was reduced using dimethylformamide (DMF) to form graphene, (Fardindoost, Hosseini, & Hatamie, ; Ghafary, Nikkhah, Hatamie, & Hosseinkhani, ; Hosseini, Iraji Zad, Ghiass, Fardindoost, & Hatamie, ). Initially, the appropriate amount of the GO was dissolved in 20 ml DMF using stirrer.…”

Section: Methodsmentioning

confidence: 99%

Systems toxicology assessment revealed the impact of graphene‐based materials on cell cycle regulators

Farahani

Rezaei‐Tavirani

Zali

et al. 2020

J Biomedical Materials Res

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Understanding the cellular and molecular toxicity of graphene and its derivatives is essential for their biomedical applications. Herein, gene expression profile of graphene-exposed cells was retrieved from the Gene expression omnibus database.Differentially expressed genes and their functional roles were then investigated through the pathway, protein-protein interaction (PPI) network, and module analysis.High degree (hub) and high betweenness centrality (bottleneck) nodes were subsequently identified. The functional analysis of central genes indicated that these graphene-gene interactions could be of great value for further investigation. Accordingly, we also followed the expression of five hub-bottleneck genes in graphenetreated murine peritoneal macrophages and human breast cancer cell line by realtime PCR. The five hub-bottleneck genes related to graphene cytotoxicity; CDK1, CCNB1, PLK1, TOP2A, and CCNA2 were identified through network analysis, which were highly correlated with regulation of cell cycle processes. The module analysis indicated the cell cycle pathway to be the predominant one. Gene expression evaluation showed downregulation of these genes in the macrophages and cancer cells treated with graphene. These results provided some new intuitions concerning the graphene-cell interactions and unveiled targeting critical cell cycle regulators. The present study indicated some toxic effects of graphene-based materials through systems toxicology assessment. Integrating gene expression and PPI network may help explaining biological responses of graphene and lead to beneficial impacts in nanomedicine. K E Y W O R D Scell cycle, gene expression, graphene, protein-protein interaction network, systems toxicology

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A new approach to flexible humidity sensors using graphene quantum dots

Abstract: Highly sensitive flexible humidity sensors based on graphene quantum dots (GQDs) were developed. The GQD sensors have potential for application in wearable electronics and RH monitoring.

Cited by 53 publications

References 43 publications

Recent Advances in Graphene-Based Humidity Sensors

Recent Advances in Graphene-Based Humidity Sensors

Ultrafast‐Response Humidity Sensor with High Humidity Durability Based on a Freestanding Film of Graphene Oxide Supramolecular

Systems toxicology assessment revealed the impact of graphene‐based materials on cell cycle regulators

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