24 July 2024
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Understanding Lung Cancer VOC Sensors

Lung cancer is one of the most prevalent and deadly forms of cancer worldwide, with early detection being crucial for effective treatment and improved outcomes. One promising avenue for early detection is through the use of volatile organic compounds (VOCs) as biomarkers for lung cancer. VOCs are organic chemicals that can be detected in exhaled breath and may indicate the presence of lung cancer.

Metal oxide semiconductors (MOS) have been explored for their sensitivity to VOCs, showing promising performance characteristics. However, the challenge lies in detecting lung cancer biomarker VOCs at very low concentrations, typically below 1 part per million (ppm). Most metal oxides struggle to respond effectively at such low levels, which can hinder early diagnosis efforts.

Developing Advanced Lung Cancer VOC Sensors

To address this challenge, a team of material scientists led by Professor Chao Zhang from Yangzhou University in China developed a novel approach using Na-doped zinc oxide nanoneedles for enhanced detection of lung cancer biomarker VOCs at low concentrations. By doping zinc oxide with sodium ions assisted by citric acid, the researchers aimed to improve the performance of metal oxide-based gas sensors, enabling high responsiveness to VOCs at sub-ppm levels.

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Metal ion doping, particularly with alkali metals like sodium, was found to enhance the sensing capabilities of zinc oxide. The solubility of alkali metals in the ZnO lattice plays a critical role in doping stability and the formation of oxygen vacancies, which are essential for gas sensing properties. The researchers employed a solvothermal method to fabricate three-dimensional nanoneedles of Na-doped ZnO, optimizing the preparation process to achieve the best results.

Enhanced Sensitivity and Performance

The experimental results demonstrated that the Na-doped ZnO gas sensor exhibited high sensitivity to lung cancer biomarker VOCs at low concentrations, outperforming pure ZnO sensors by a significant margin. The sensor showed excellent selectivity for formaldehyde, good humidity resistance, and reliable repeatability at an optimal operating temperature of 225°C.

The mechanism behind the improved performance of the Na-doped ZnO sensor involves the replacement of Zn ions with Na ions, leading to the generation of more oxygen vacancies and increased target gas adsorption sites. Furthermore, the introduction of Na as an impurity energy level near the top of the valence band reduced the bandgap width, promoting electron leaps and enhancing gas-sensitive performance.

Implications for Early Lung Cancer Diagnosis

The development of advanced gas sensors like the Na-doped ZnO nanoneedles holds significant promise for early lung cancer diagnosis through non-invasive breath tests. By enhancing the detection sensitivity and selectivity for specific VOC biomarkers associated with lung cancer, these sensors could revolutionize the field of cancer diagnostics.

The innovative approach of using Na-doped zinc oxide nanoneedles for detecting lung cancer biomarker VOCs at low concentrations represents a significant advancement in the field of gas sensor technology. With further research and development, these sensors could play a vital role in improving early detection and monitoring of lung cancer, ultimately saving lives and improving patient outcomes.

Links to additional Resources:

1. https://www.nature.com/articles/s41598-022-16494-6 2. https://www.sciencedirect.com/science/article/abs/pii/S0925400522002860 3. https://pubs.acs.org/doi/10.1021/acs.analchem.2c00733

Related Wikipedia Articles

Topics: lung cancer, volatile organic compounds (VOCs), metal oxide semiconductors

Lung cancer
Lung cancer, also known as lung carcinoma, is a malignant tumor that begins in the lung. Lung cancer is caused by genetic damage to the DNA of cells in the airways, often caused by cigarette smoking or inhaling damaging chemicals. Damaged airway cells gain the ability to multiply unchecked, causing...
Read more: Lung cancer

Volatile organic compound
Volatile organic compounds (VOCs) are organic compounds that have a high vapor pressure at room temperature. High vapor pressure correlates with a low boiling point, which relates to the number of the sample's molecules in the surrounding air, a trait known as volatility. VOCs are responsible for the odor of...
Read more: Volatile organic compound

The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET), most commonly fabricated by the controlled oxidation of silicon. It has an insulated gate, the voltage of which determines the conductivity of the device. This ability to change conductivity with the amount of applied...
Read more: MOSFET

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