SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
·
IF 4.098
Honglin Zhang,Ting Liu,Qiuhe Li,Xiyu Zhang,Hua Zhao,Yangdong Zheng,Feng Qin,Zhiguo Zhang,Tianqi Sheng,Ye Tian
The oxygen sensing enhancement based on room temperature phosphorescence (RTP) of Gd-HMME adjusted by imidazole was studied. The phosphorescence intensity I P0 and the Stern-Volmer equations under different imidazole concentration were obtained, and the physical mechanism of imidazole regulating the oxygen quenching constant K SV was analyzed. It was found that the K SV value increased by ∼46 folds in the range of 12.4(1)–576.1(5) kPa −1 , and the large-scale variation of K SV is conducive to the realization of high precision oxygen concentration measurement in a wide range. In addition, the standard deviation σ of continuous measurement results was given, and the limit of detection (LOD) was determined to be 6.6 ppm.
研究领域:
分析化学
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材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SENSORS
·
2025
·Vol. 25
·期 6
·1670
·
IF 3.5
Yujie Niu,Jinxin Wang,Zhongxing Zhang,Ting Liu
Gaseous oxygen detection is essential in numerous production and manufacturing sectors. To meet the varying oxygen detection requirements across different fields, techniques that offer a wide oxygen detection range should be developed. In this study, a wood-based oxygen sensing material was designed using balsa wood as the supporting matrix and gadolinium hemoporphyrin monomethyl ether (Gd-HMME) as the oxygen-sensitive indicator. The wood-based Gd-HMME exhibits a cellular porous structure, which not only facilitates the loading of a substantial number of indicator molecules but also enables the rapid interaction between indicators and oxygen molecules.OPis defined as the ratio of the phosphorescence intensity of the oxygen-sensing material in the anaerobic and aerobic environment. A linear relationship betweenOPand oxygen partial pressure ([O2]) was obtained within the whole range of [O2] (0–100 kPa). The wood-based Gd-HMME exhibited excellent resistance to photobleaching, along with a rapid response time (3.9 s) and recovery time (4.4 s). It was demonstrated that the measurement results obtained using wood-based Gd-HMME were not influenced by other gaseous components present in the air. An automatic oxygen detection system was developed using LabVIEW for practical use, and the limit of detection was determined to be 0.01 kPa.
研究领域:
材料科学
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光学传感
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产品关联
DOI
PubMed
高影响因子
DALTON TRANSACTIONS
·
2016
·Vol. 45
·期 42
·16889-16895
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IF 4.177
Lixin Zang,Huimin Zhao,Jianyu Hua,Feng Qin,Yangdong Zheng,Zhiguo Zhang,Wenwu Cao
A mechanism for the enhanced room-temperature phosphorescence (RTP) of gadolinium-coordinated hematoporphyrin monomethyl ether (Gd-HMME) in the presence of imidazole and free gadolinium ions (Gd3+) is revealed. Imidazole, the molten solvent used in the synthesis of Gd-HMME, was effective in enhancing the Gd-HMME RTP. In the presence of imidazole, further enhancement of the Gd-HMME RTP was observed upon adding Gd3+. Overall, a 40-fold enhancement of Gd-HMME RTP intensity was achieved by adding both imidazole and Gd3+. In addition, there was an increase in the RTP lifetime. Through spectroscopic analysis, we deduced that a protective medium is formed by the imidazole and the degree of this protection is further increased by Gd3+. The protective medium enhances the Gd-HMME RTP by partially inhibiting energy transfer from the lowest triplet state of Gd-HMME to oxygen. This was demonstrated by the presence of lower levels of singlet oxygen in the Gd-HMME solution after the addition of imidazole. These results indicate that imidazole could have potential application as an RTP enhancer or triplet state protector.
研究领域:
化学
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材料科学
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光化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF LUMINESCENCE
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2017
·
IF 2.686
Huimin Zhao,Lixin Zang,Qinyu Liu,Bingjie Ma,Meng Kou,Jinhua Lv,Chengshan Guo
The enhancement of the room-temperature phosphorescence (RTP) emissions of phosphorescent metalloporphyrins is critical toward extending their applications in many fields. Imidazole is widely used as a molten solvent in the synthesis of metalloporphyrins and can influence their RTP emissions. Here, the effects of imidazole on the RTP emissions of a series of metalloporphyrins (hematoporphyrin monomethyl ether coordinated to gadolinium (Gd-HMME), lutetium (Lu-HMME), and palladium (Pd-HMME) ions) were studied. It was found that imidazole effectively enhanced the RTP emissions of these metalloporphyrins both on a solid matrix and in solution. For metalloporphyrins on a solid matrix (filter paper), the RTP intensities of samples immersed in an imidazole solution were much higher than those immersed in methanol. Imidazole enhanced the phosphorescence quantum yields ( Φ P ) of Gd-, Lu- and Pd-HMME on filter paper by 23-, 5.0-, and 3.5-fold, respectively. For metalloporphyrins in solution (methanol), the RTP intensities increased gradually with the concentration of imidazole. These results indicate that imidazole has potential as an RTP enhancer by protecting the triplet states of phosphorescent metalloporphyrins.
研究领域:
化学
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材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）