1 wt% RGO-CdFe2O4复合材料：高性能丙酮气体传感器
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"本文主要研究了通过水热法制备的还原氧化石墨烯（RGO）-CdFe2O4复合材料在丙酮气体传感中的性能。研究者以不同的RGO含量（0、0.1、0.5、1、2和3 wt％）制备了复合材料，并通过X射线衍射（XRD）、热重分析（TGA）、傅立叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、氮气吸附-解吸和拉曼光谱等多种表征手段对其进行了详细分析。实验结果显示，含有1 wt％RGO的RGO-CdFe2O4复合材料传感器在检测丙酮蒸气时表现出优异的敏感性和选择性。在270°C下，针对1000 ppm和0.01 ppm丙酮蒸气，该传感器的响应值分别为1069.0和2.0，响应时间和恢复时间分别为5秒和3秒。"
这篇论文探讨的关键知识点包括：
1. **水热法制备复合材料**：这是一种在高温高压水溶液环境下合成纳米材料或复合材料的方法。在此过程中，RGO与CdFe2O4在180°C下反应12小时，形成均匀的复合材料。
2. **还原氧化石墨烯（RGO）**：氧化石墨烯经过化学还原得到的材料，具有良好的导电性和大的比表面积，能增强复合材料的传感性能。
3. **CdFe2O4**：这是一种磁性氧化物，通常称为磁赤铁矿，具有较高的热稳定性和化学稳定性，常用于气体传感器中。
4. **复合材料特性分析**：XRD用于确定材料的晶体结构；TGA测量材料的重量随温度变化，评估其热稳定性；FT-IR分析化合物的官能团；SEM观察材料表面形态；N2吸附-解吸分析孔隙结构；拉曼光谱则揭示材料的分子振动模式。
5. **气敏响应和选择性**：传感器对特定气体（丙酮）的响应程度和对其他气体的区分能力是评价其性能的重要指标。实验发现1 wt％RGO-CdFe2O4复合材料的传感器在这两方面表现突出。
6. **丙酮传感性能**：在270°C下，1 wt％RGO-CdFe2O4传感器对丙酮具有高响应度，对于1000 ppm和0.01 ppm丙酮的响应值分别为1069.0和2.0，且具有快速的响应和恢复时间，这表明其在低浓度丙酮检测上的潜力。
7. **应用前景**：鉴于其出色的丙酮检测性能，这种RGO-CdFe2O4复合材料传感器可能在环境监测、工业生产过程控制以及医疗诊断等领域有广泛的应用价值。
这篇研究展示了RGO-CdFe2O4复合材料在气体传感领域的优越性能，尤其是在丙酮检测方面，为设计新型高性能气体传感器提供了新的思路。
Acetone sensing properties of reduced graphene
oxide–CdFe
2
O
4
composites prepared by hydrothermal method
Tao Hu
a
, Xiangfeng Chu
a,
n
, Feng Gao
b
, Yongping Dong
a
,
Wenqi Sun
a
, Linshan Bai
a
a
School of Chemistry and Chemical Engineering, Anhui University of Technology, Maanshan 243002, PR China
b
Department of Materials Science and Engineering, Nanjing University, Nanjing 210093, PR China
article info
Available online 3 March 2015
Keywords:
Reduced graphene oxide
CdFe
2
O
4
Gas sensor
Acetone vapor
abstract
Reduced graphene oxide (RGO)–CdFe
2
O
4
composites with different amounts of RGO (0, 0.1,
0.5, 1, 2 and 3 wt%) wer e prepared via a hydrothermal method at 180 1Cfor12h.Theas-
prepared RGO–CdFe
2
O
4
composites were characterized by X-ra y diffraction (XRD), Thermo-
gravimetric analysis (T G A), Fourier transform infrared spectra (FT-IR), Scanning electron
microscopy (SEM), N
2
adsorption–desorption and Raman spectroscopy, respectively. The
effect of the amount of RGO in the composites on the gas-sensing responses and the gas-
sensing selectivity of the materials was investigated. The experimental results revealed that
thesensorbasedon1wt%RGO–CdFe
2
O
4
composite (180 1C, 12 h) exhibited high response
and good selectivity to acetone vapor, and the response to 1 000 ppm and 0.01 ppm acetone
vapor attained 1069.0 and 2.0 when operating at 270 1C, respectively. The response time and
recovery time for 0.01 ppm acetone vapor were only 5 s and 3 s, respectively.
& 2015 Published by Elsevier Ltd.
1. Introduction
Acetone is often used as an organic solvent (plastic, fiber
and spray-paint) or chemical intermediate (dyestuff, rubber
and lubricating oil). Although it is popularly regarded as a low
toxic compound, it may cause headache, bronchitis and even
narcosis when the concentration of acetone vapor in air is
higher than 10,000 ppm [1]. The medical reports indicate that
acetone is one of the products e xhaled by diabetic patients
who hav e higher the concentration of acetone in their blood
and spittle than healthy person [2,3].Theconcentrationof
acetone in exhaled air of a health y person varies from 0.3 to
0.9 ppm, but the concentration of acetone in exhalation of
diabetic patient increases to be higher than 1 .8 ppm [4,5].
Accord ing to hy gienic standard for the design of industrial
enterprises (TJ36-79) [6], the concentration of acetone in
workshop should be lower than 400 mg/m
3
(1 54.5 ppm).
Hence, it is of great significance to measure the concentration
of acetone for our work environment safety and human health.
In the past decades, gas sensors have been applied in
many fields, such as industrial process control, detection of
toxic environmental pollutants, human health and the pre-
vention of hazardous gas leakages [7,8]. The gas sensing
properties of man y metal oxides, mixed oxides and complex
oxides have been deeply investigated in recent years. Spinel-
type oxides with a formula of AB
2
O
4
, such as the ferrites
(ZnFe
2
O
4
[8,9],CoFe
2
O
4
[10],NiFe
2
O
4
[11],CuFe
2
O
4
[1 2] and
CdFe
2
O
4
[13–15]), have been proven to be important complex
oxides in the field of gas sensors. Lou et al. [1 3 ] reported that
the response of the sensor based on CdFe
2
O
4
powder pre-
pared by sol–gel method to 100 ppm acetone was only 6.9
when operating at 250 1C. Our group [14] fabricated the
sensor based on CdFe
2
O
4
thick film prepared by co-
precipitati on method, the CdFe
2
O
4
thick film was capable of
detecting H
2
SandCH
3
SH at 250 1C. Yang et al. [1 5] prepared
CdFe
2
O
4
using an inverse titration chemical coprecipitation
method and investigat ed their acetone- sensing properties,
they found that the optimal operating temperature of the
Contents lists available at ScienceDirect
journal homepage: www.elsevier.com/locate/mssp
Materials Science in Semiconductor Processing
http://dx.doi.org/10.1016/j.mssp.2015.02.037
1369-8001/& 2015 Published by Elsevier Ltd.
n
Corresponding author. Tel.: þ 86 555 2311822; fax: þ 86 551 2311822.
E-mail address: xfchu99@ahut.edu.cn (X. Chu).
Materials Science in Semiconductor Processing 34 (2015) 146–153
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