Defect promoted photothermoelectric effect in densely aligned ZnO nanorod arrays for self-powered position-sensitive photodetection

Du, Xueyan; Tian, Weiliang; Zhang, Ziqi; Hui, Bin; Pan, Jiahui; Sun, Jianhua; Zhang, Kewei

doi:10.1016/j.jmat.2021.11.002

Cited by 10 publications

(5 citation statements)

References 36 publications

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“…Figure g shows room-temperature PL spectra of the Bi 2 O 3 architectures annealed at different temperatures, presenting both near-band-edge (NBE) emission (ultraviolet region) and deep-level (DL) emission (visible region). By Gaussian fitting, the area ratio of DL to NBE ( I DL / I NBE ) can be estimated, which is regarded as an indicator of the relative content of defects in the samples. , As depicted in Figures g and S3, the I DL / I NBE values of the Bi 2 O 3 sample annealed at 200, 300, 400, and 500 °C are estimated to be 1.62, 1.82, 3.29, and 2.40, respectively. This result suggests that the 400 °C-annealed Bi 2 O 3 architectures possess the most abundant defects, which would result in an increased number of reactive sites for gas adsorption.…”

Section: Resultsmentioning

confidence: 99%

Porous Oxide-Functionalized Seaweed Fabric as a Flexible Breath Sensor for Noninvasive Nephropathy Diagnosis

Zhang

et al. 2022

ACS Sens.

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Ever-increasing quality of life demands low-power and reliable gas-sensing technology for point-of-care monitoring of human health by relevant breath biomarkers. However, precise identification is rather challenging due to the relatively small concentration and an abundance of interferents. Herein, a breath sensor that can detect ppb-level ammonia is constructed based on a soft–hard interface design of biocompatible seaweed fabric and nanosheet-assembled bismuth oxide architectures after undergoing heat treatment. Benefiting from abundant defective sites and surface chemical state changes, the flexible sensor can work at room temperature and exhibits superior characteristics for ammonia detection, including ultrahigh response (1296), short response/recovery time (12/6 s), small detection limit (117 ppb), and remarkable anti-interference, even after repetitive mechanical bending and long-term fatigue. Furthermore, the flexible sensor demonstrates a noticeable response to the exhaled breath of a patient with Helicobacter pylori infection. After connecting the sensor with a green-light-emitting diode (LED) in the circuit, an alarm system successfully warns about ammonia levels based on the brightness of the LED. This work provides a potential strategy for wide-range ammonia detection and opens new applications in predictive and personalized healthcare platforms for noninvasive medical diagnosis.

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Section: Resultsmentioning

confidence: 99%

Porous Oxide-Functionalized Seaweed Fabric as a Flexible Breath Sensor for Noninvasive Nephropathy Diagnosis

Zhang

et al. 2022

ACS Sens.

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“…As compared with the pure WO 3 sensor, whose peak response is 4.3 at 170 ℃, the sensor based on the 0.4-Bi 2 O 3 /WO 3 composite exhibits a much higher response (2.1-fold) to the TEA at a lower operating temperature (30 ℃-decrement), revealing the advantage of the Bi 2 O 3 /WO 3 composite in TEA detection. Herein, the performances of recent TEA sensors based on various metal oxides are compared [37][38][39][40][41][42][43][44][45][46], as summarized in Table 1. There is no doubt that the Bi 2 O 3 /WO 3 sensor possesses the ideal gas-sensing characteristics, including high response and low power consumption.…”

Section: Resultsmentioning

confidence: 99%

Interfacial energy barrier tuning of hierarchical Bi2O3/WO3 heterojunctions for advanced triethylamine sensor

Zhang

Li²,

Zhang³

et al. 2022

J Adv Ceram

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Traditional triethylamine (TEA) sensors suffer from the drawback of serious cross-sensitivity due to the low charge-transfer ability of gas-sensing materials. Herein, an advanced anti-interference TEA sensor is designed by utilizing interfacial energy barriers of hierarchical Bi2O3/WO3 composite. Benefiting from abundant slit-like pores, desirable defect features, and amplification effect of heterojunctions, the sensor based on Bi2O3/WO3 composite with 40% Bi2O3 (0.4-Bi2O3/WO3) demonstrates remarkable performance in terms of faster response/recovery time (1.7-fold/1.2-fold), higher response (2.1-fold), and lower power consumption (30 °C-decrement) as compared with the pristine WO3 sensor. Furthermore, the composite sensor exhibits long-term stability, reproducibility, and negligible response towards interfering molecules, indicating the promising potential of Bi2O3/WO3 heterojunctions in anti-interference detection of low-concentration TEA in real applications. This work not only offers a rational solution to design advanced gas sensors by tuning the interfacial energy barriers of heterojunctions, but also provides a fundamental understanding of hierarchical Bi2O3 structures in the gas-sensing field.

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“…Building a self‐powered system based on various renewable energy technologies is expected to be an effective way to address the challenges mentioned above. [ 7 , 8 , 9 , 10 , 11 , 12 ] Among them, the triboelectric nanogenerator (TENG) is particularly remarkable. This is because TENG is gaining popularity as an effective power supply for agricultural IoTs.…”

Section: Introductionmentioning

confidence: 99%

A Self‐Powered Biochemical Sensor for Intelligent Agriculture Enabled by Signal Enhanced Triboelectric Nanogenerator

Gao,

Zhou,

Cao

et al. 2024

Advanced Science

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Precise agriculture based on intelligent agriculture plays a significant role in sustainable development. The agricultural Internet of Things (IoTs) is a crucial foundation for intelligent agriculture. However, the development of agricultural IoTs has led to exponential growth in various sensors, posing a major challenge in achieving long‐term stable power supply for these distributed sensors. Introducing a self‐powered active biochemical sensor can help, but current sensors have poor sensitivity and specificity making this application challenging. To overcome this limitation, a triboelectric nanogenerator (TENG)‐based self‐powered active urea sensor which demonstrates high sensitivity and specificity is developed. This device achieves signal enhancement by introducing a volume effect to enhance the utilization of charges through a novel dual‐electrode structure, and improves the specificity of urea detection by utilizing an enzyme‐catalyzed reaction. The device is successfully used to monitor the variation of urea concentration during crop growth with concentrations as low as 4 µm, without being significantly affected by common fertilizers such as potassium chloride or ammonium dihydrogen phosphate. This is the first self‐powered active biochemical sensor capable of highly specific and highly sensitive fertilizer detection, pointing toward a new direction for developing self‐powered active biochemical sensor systems within sustainable development‐oriented agricultural IoTs.

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Defect promoted photothermoelectric effect in densely aligned ZnO nanorod arrays for self-powered position-sensitive photodetection

Cited by 10 publications

References 36 publications

Porous Oxide-Functionalized Seaweed Fabric as a Flexible Breath Sensor for Noninvasive Nephropathy Diagnosis

Porous Oxide-Functionalized Seaweed Fabric as a Flexible Breath Sensor for Noninvasive Nephropathy Diagnosis

Interfacial energy barrier tuning of hierarchical Bi2O3/WO3 heterojunctions for advanced triethylamine sensor

A Self‐Powered Biochemical Sensor for Intelligent Agriculture Enabled by Signal Enhanced Triboelectric Nanogenerator

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