11 research outputs found
Rancang Bangun Pengkondisi Sinyal Kondisioning Instrumen Biosensor Berbasis Mikrokontroler
No full textSistem sensor yang dikembangkan dalam penelitianini bersifat pintar (intelligent) yaitu memiliki kemampuan untukmendeteksi keadaan sensor, serta dapat melakukan kalibrasisendiri (self callibration). Produk yang dihasilkan diaplikasikanpada bidang monitoring kesehatan. Pengukuran kinerjarangkaian akuisisi data dilakukan secara bertahap diawali daribagian signal conditioning yang terdiri atas peubah arus ketegangan dan penguat tegangan hingga konversi tegangan kedalam format digital pada bagian ADC. Pada tahap pertamadari bagian signal conditioning, rangkaian peubah arus ketegangan diberi masukan sinyal berupa arus sebesar 0 – 100 μAsecara bertahap kemudian diamati besaran luaran tegangannya.Untuk kenaikan arus sebesar 10 μA maka respon tegangan yangdihasilkan mendekati linier dengan error maksimum hingga ±0,1V.Selanjutnya pada tahap kedua dari bagian signal conditioning,tegangan hasil konversi dikuatkan dua kali untuk menghasilkannilai tegangan yang bervariasi antara 0 – 2 V. Untuk setiapmasukan arus pada peubah arus dan tegangan maka luarantegangan setelah dikuatkan, dapat dilihat bahwa linieritasrangkaian penguat cukup baik sehingga total error yangdihasilkan bagian signal conditioning tetap bernilai ±0,1 V.Luaran sinyal tegangan dari bagian signal conditioningselanjutnya menjadi masukan bagi bagian peubah sinyal analogke sinyal digital (ADC). Untuk setiap nilai tegangan antara 0 – 2V akan diubah kedalam format digital 10 bit. Hasil pengamatanmemperlihatkan untuk setiap arus masukan signal conditioningyang telah diubah dalam bentuk tegangan
Rancang Bangun Rangkaian Pengkondisi Sinyal Untuk Sensor Deteksi Kandungan Nitrat
Get PDFCircuit Design for Sensor Detection Signal Conditioner Nitrate Content. Nitrate is one of macro nutrients very important for agriculture. The availability of nitrate in soil is limited because it is very easy to leaching by rain, therefore nitrate could be contaminated ground water by over-process of fertilizer. This process could also produce inefficiency in agriculture if it happened continuesly without pre-analysis of farm field. The answer those problems, it is need to develop the ion sensor system to measure concentrations of nitrat in soil. The system is consist of nitrate ion sensor device, signal conditioning and data acquisition circuit. The design and fabrications of signal conditioning circuit which integrated into ion nitrate sensor system and will apply for agriculture. This sensor has been used amperometric with three electrodes configuration: working, reference and auxiliarry; the ion senstive membrane has use conductive polymer. The screen printing technique has been choosen to fabricate electrodes and deposition technique for ion sensitive membrane is electropolymerization. The characterization of sensor has been conducted using nitrate standard solution with range of concentration between 1 µM–1 mM. The characterization has shown that sensor has a good response with cureent output between 2.8–4.71 µA, liniearity factor is 99.65% and time response 250 second.  
Phosphate ion sensor fabrication based on conductive polymer polypyrrole film coatings in doped phosphate using thick film technology
No full textThis study describes the development of chemical sensors to detect polypyrrole (PPy) based phosphate sensors in doped di-ammonium hydrogen phosphate (DAP) with thick film technology (TFT). Manufacturing screen-printed carbon electrode (SPCE) with thick film uses alumina substrate provided a more portable, miniature, inexpensive, and reduced use of samples and reagents. Polymer polypyrrole and di-ammonium hydrogen phosphate as sensitive membranes are electrodeposition on carbon electrodes. Characterization has been conducted to see the electrode morphology in scanning electron microscopy (SEM) test, which showed that sensitive material particles were distributed evenly on the surface of the sample and spherical. The energy dispersive spectroscopy (EDS) experiment results showed the atomic composition respectively carbon 86.95 %, nitrogen 6.94 %, oxygen 5.9 %, and phosphate 0.21 %, which were exposed to the electrode. The performance test of electrodes with a phosphate standard solution has proceeded at a concentration between 5 to 100 mg/l, which is measured using the galvanostatic method. The voltage range was from 0.252 to 0.957 V with R2 at approximately 90.265 %. The results of sensor performance were concluded that the electrode was able to detect phosphate ions
Structural and Morphological Analysis of Nanocomposite SnO<sub>2</sub>-Graphene Synthesized by Sol-Gel Method
No full textGas sensor performance is strongly influenced by the crystal structure, composition and morphology of the material used. In this paper, structural and morphological analysis of nanocomposite SnO2-Graphene synthesized by Sol-Gel method with the composition of 1:1, 1:2, 1:3 will be described. Analysis of the morphology and structure of nanocomposite SnO2-Graphene is investigated using XRD, SEM and TEM with the purpose of obtaining the crystal structure, morphology, composition and size of the resulting particles. The XRD results showed that the formation of the crystalline phase can be recorded at 2θ = 26.64; 34.2; 51.92, where the results of SEM show that the nanomaterial SnO2 has tetragonal structure while the graphene has hexagonal structure. The nanocomposite SnO2-Graphene has nanorod pattern. Furthermore, the surface analysis using TEM of nanocomposite SnO2-Graphene shows that the surface has the rod diameter in the range of 5-8 nm. The unique nanopattern of SnO2-Graphene will have potential applicability as the sensing material for CO gas sensor.</jats:p
Synthesis and Characterization of Nanocomposites Tin Oxide-Graphene Doping Pd Using Polyol Method
No full textThis paper report on polyol method for Pd doped tin oxide-graphene nanocomposite thin film. XRD result shows sharp peaks at certain 2θ value and match with tin oxide, graphene, and Pd database. FTIR result shows peak from alcohol chain for –OH strong bonded absorption (3444 cm-1), also there are aldehyde and ketone which are indicated by C=O strong absorption (1751 cm-1). Moreover, alkene is also formed for decreasing symmetry intensity C=C (1616 cm-1), while alkyne is formed at strong deformation absorption at 646 and 613 cm-1. SEM and TEM result show SnO2 particles are attached uniformly on graphene surface layer. The composition for C, O, Sn, and Pd are 33.13, 25.58, 35.35 and 5.94%, respectively. This result indicated that the good composition is formed for Pd doped SnO2-graphene nanocomposite. The nanocomposite is promising materials for toxic gas sensor application at low temperature
Fabrication of nitrate ion sensor based on conductive polyaniline doped with nitrate using thick film technology
Get PDFNitrate is one of the nutrients that can give an effect on the environment if it is applied in excess. It is also easily soluble in water and it has the potential to be a pollutant in groundwater by the over-process of fertilizer. Therefore, it needs a detected component to give the right measure for nitrate in the soil, called a nitrate ion sensor. It consists of three electrodes configuration, namely, working, counter, and reference electrodes with conductive polyaniline doped with Nitrate (NO₃‾) which is fabricated by thick film technology. In previous research, acidic media was used as a solvent for polyaniline, while this research used water (H2O) solvent. The result of characterization showed that particles were distributed evenly on the sample with the form of particles being small balls with a dimension of 0.18 µm and the percentage of atomic elements being: 91.96 % carbon, 3.14 % nitrogen, and 4.9 % oxygen. The performance of sensors was investigated using potentiostat with four concentrations of nitrate standard solution. The result showed good response with a voltage range in each concentration of nitrate standard solution being 0.5002 Volt (10 mg/l), 1.3552 Volt (20 mg/l), 1.1208 Volt (50 mg/l), and 0.8963 Volt (100 mg/l). It was found that nitrate sensors with nitrate-doped conductive polymer, polyaniline, as the sensitive membrane responded well to detecting nitrate elements in precision farming and the sensitivity showed that for every 1 mg/l concentration in nitrate standard solution, the voltage increases by 0.0007
Carbon electrode sensitivity enhancement for lead detection using polypyrrole, ionic liquid, and nafion composite
Get PDFThis paper concerns enhancing a lead detection sensor using a combination of polypyrrole (PPy), Nafion (N), and ionic liquid (IL) with thick-film or screen-printing technology on sensitive material-based carbon electrodes. Electrode characterization using a scanning electron microscope (SEM) was conducted to see the morphology of sensitive materials, showing that the spherical particles were distributed evenly on the electrode surface. Analysis using energy dispersive spectroscopy (EDS) shows that the element's atomic composition is 84.92 %, 8.81 %, 6.26 %, and 0.01 % for carbon, nitrogen, oxygen, and bismuth, respectively. Potentiostat measurement with the ambient temperature of 25 °C on a standard lead solution with concentration ranging from 0.05 to 0.5 mg/l yields an average output voltage ranging from 2.16 to 2.27 V. It can be concluded that the sensor is able to detect lead with a sensitivity of 0.21 V in each addition of solution concentration (mg/l) and give an 84 % concentration contribution to the voltage
Synthesis and Characterization of Nanocomposites Tin Oxide-Graphene Doping Pd Using Polyol Method
No full textThis paper report on polyol method for Pd doped tin oxide-graphene nanocomposite thin film. XRD result shows sharp peaks at certain 2θ value and match with tin oxide, graphene, and Pd database. FTIR result shows peak from alcohol chain for –OH strong bonded absorption (3444 cm-1), also there are aldehyde and ketone which are indicated by C=O strong absorption (1751 cm-1). Moreover, alkene is also formed for decreasing symmetry intensity C=C (1616 cm-1), while alkyne is formed at strong deformation absorption at 646 and 613 cm-1. SEM and TEM result show SnO2 particles are attached uniformly on graphene surface layer. The composition for C, O, Sn, and Pd are 33.13, 25.58, 35.35 and 5.94%, respectively. This result indicated that the good composition is formed for Pd doped SnO2-graphene nanocomposite. The nanocomposite is promising materials for toxic gas sensor application at low temperature.</jats:p
Investigation of Nanostructured SnO 2 Synthesized with Polyol Technique for CO Gas Sensor Applications
No full textHigh Performance Carbon Monoxide Sensor Based on Nano Composite of SnO<sub>2</sub>-Graphene
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