Effect of Au nanoparticle size on the gas-sensing performance of p-CuO nanowires

Lee, Jun-Seong; Katoch, Akash; Kim, Jae‐Hun; Kim, Sang Sub

doi:10.1016/j.snb.2015.08.037

Cited by 85 publications

(35 citation statements)

References 35 publications

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“…For instance, the loading of Pt, Au, and Pd is known to increase the gas response or to change the gas selectivity of NiO-, [108][109][110][111][112][113] Co 3 O 4 -, [114][115][116][117][118] Cr 2 O 3 -, [119,120] and CuObased based sensors. [121] This can be explained by the catalytic promotion of sensing reactions (chemical sensitization) and/or by a decrease in background hole concentration due to contact with noble metals with different work function values (electronic sensitization).…”

Section: P-type Oxide Semiconductor Chemiresistorsmentioning

confidence: 99%

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

2020

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With rapid progress in device integration and computing power, the realization of highly miniaturized one-chip artificial olfaction with superior performance is close and should be further supported by the rational design of chemical sensors and chemical sensing materials. The number of gas sensors tends to increase in order to sniff more complex odors with the progress of civilization. This explains the evolution from a single chemical sensor to complicated artificial olfaction using sensor arrays. At the advent of oxide chemiresistive gas sensors in the 1960s and 1970s, a single gas sensor was widely used to detect toxic, explosive, dangerous, and harmful gases, such as CO, C 3 H 8 , CH 4 , H 2 S, and NO 2 , in a selective manner. [26,27] However, a single sensor is often insufficient for recognizing most of the natural odors encountered in daily life, which consist of hundreds to thousands of different chemicals. [28] In the mammalian olfactory system, odorants are initially detected by olfactory receptors (ORs) covering the surface of the cilia projected from olfactory sensory neurons (OSNs), which are located in the olfactory epithelium lining the nasal cavity. These signals are transmitted to the glomeruli in the olfactory bulb, where a high degree of signal integration happens (Figure 1a). [29] Finally, the signals are sent through mitral cells to a higher brain region (olfactory cortex), and the signals are subsequently combined or modified in a variety of ways by parallel processing for analysis and interpretation (Figure 1b). [30] Each OR can detect various kinds of odorants, and similarly, each odorant can also be recognized by a number of ORs. That is, the olfactory system determines multiple odorants from various combinations of ORs (Figure 1c). [31] For better olfaction, both OSNs and ORs should be abundant. A larger number of OSNs is advantageous for detecting trace concentrations of analytes and ligands. [32] For instance, dogs with more OSNs are better than humans at detecting explosives, searching and rescuing, diagnosing disease, and assessing agricultural products. [33] If a mammal can detect larger numbers of faint gas components within odors, he can perceive and identify the odors more accurately. From this perspective, gas sensors with lower detection limits would be assembled to the stronger artificial olfaction. Kinds of ORs are also important. Mammals are known to have ≈1000 different kinds of ORs, and combinations of dissimilar ORs enable the discrimination of a myriad of odorants. [29] To mimic this, sensor arrays consisting of small number (5-20) of sensors that show Artificial olfaction based on gas sensor arrays aims to substitute for, support, and surpass human olfaction. Like mammalian olfaction, a larger number of sensors and more signal processing are crucial for strengthening artificial olfaction. Due to rapid progress in computing capabilities and machinelearning algorithms, on-demand high-performance artificial olfaction that can eclipse human olfaction becomes inevitable onc...

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Section: P-type Oxide Semiconductor Chemiresistorsmentioning

confidence: 99%

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

2020

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“…Nanoscale transition metal oxide nanostructures have been attracting much attention in recent years because of their unique physical and chemical properties as well as promising applications in micro/nanoscale devices. [1][2][3][4] Cupric oxide (CuO) is a p-type semiconductor with a narrow band gap, and it has shown attractive properties and potential applications in eld emissions, 5 gas/bio sensors, 6 photo detectors, 7 photocatalysis, 8 and superconductors. 9 Thermal oxidation is a very simple, efficient, low temperature, and low-cost preparation method, which is suitable for the large scale synthesis of nanostructures.…”

Section: Introductionmentioning

confidence: 99%

Electric field assisted growth and field emission properties of thermally oxidized CuO nanowires

et al. 2017

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“… 7 − 9 Using metal nanoparticles for sensing is a good approach to sensor miniaturization. 10 − 12 Intrinsically, many metal nanoparticles exhibit environment-dependent LSPR, 13 − 15 which not only reveals the physical and chemical changes of the environment but also shows how a nanoparticle interacts with its microscopic surroundings.…”

Section: Introductionmentioning

confidence: 99%

Binary Gas Analyzer Based on a Single Gold Nanoparticle Photothermal Response

Hong

Zhang

2020

ACS Omega

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Although thermal conductivity gas analyzers are ubiquitous in industry, shrinking the sensing unit to a microscopic scale is rarely achieved. Since heat transfer between a metal nanoparticle and its ambient gas changes the temperature, refractive index, and density of the gaseous surrounding, one may tackle the problem using a single nanoparticle’s photothermal effect. Upon heating by a 532 nm laser, a single gold nanoparticle transfers heat to the surrounding gas environment, which results in a change in the photothermal polarization of a 633 nm probe laser. The amplitude of the photothermal signal correlates directly with the concentration of binary gas mixture. In He/Ar, He/N 2 , He/air, and H 2 /Ar binary gas mixtures, the signal is linearly proportional to the He and H 2 molar concentrations up to about 10%. The photothermal response comes from the microscopic gaseous environment of a single gold nanoparticle, extending from the nanoparticle roughly to the length of the gas molecule’s mean free path. This study points to a way of sensing binary gas composition in a microscopic volume using a single metal nanoparticle.

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Effect of Au nanoparticle size on the gas-sensing performance of p-CuO nanowires

Cited by 85 publications

References 35 publications

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

Rational Design of Semiconductor‐Based Chemiresistors and their Libraries for Next‐Generation Artificial Olfaction

Electric field assisted growth and field emission properties of thermally oxidized CuO nanowires

Binary Gas Analyzer Based on a Single Gold Nanoparticle Photothermal Response

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