Affi Nur Hidayah

National Research and Innovation Agency (BRIN)

Gold nanoparticles with tunable size and shape are effectively synthesized with a femtosecond laser using the seed and growth method by reducing a KAuCl4 solution with polyvinylpyrrolidone (PVP) surfactant as a stabilizer. The sizes of gold nanoparticles, including 7.30 to 9.90, 11.0, 12.0, 14.1, 17.3, 22, 23.0, 24.4, and 27.2 nm, are effectively a...

Gold nanoclusters have recently emerged a new class of functional material whose unique intermediate properties between bulk nanoparticles and single molecule. In this study, we describe a photochemical route for the preparation of gold nanoclusters (AuNCs) with glutathione (GSH) as a ligand. The GSH stabilized AuNCs (GSH-AuNCs) display molecule-li...

The investigation of Au-Ag nanoalloys as SERS (Surface Enhanced Raman Scattering) substrate in enhancement of Raman Signal was interested. In this work, we reported the performance of Au-Ag nanoalloys as SERS substrate on silicon wafer in enhancement Deltamethrin Pesticides Signal. Au0Ag100, Au50Ag50 and Au100Ag0 was synthesized using photochemical...

On Whatman Filter Paper, Surface Enhanced Raman Scattering (SERS) Substrate was created from colloidal silver nanoparticles by drop casting in varied volume colloidal nanoparticles of 3 ml and 6 ml. Using Raman Spectroscopy, SERS substrates were investigated for their ability to enhance 500 ppm of Deltamethrin pesticides Raman Signal. The number of...

Silver nanoparticle is useful metallic nanoparticle due to plasmonic property. One of the most important application of silver nanoparticle is enhancing Raman spectrum using so-called surface-enhanced Raman spectroscopy (SERS). Mostly, researchers synthesize colloidal silver nanoparticles and deposite on substrate to form SERS substrates. In this w...

Colloidal nanoalloys have been shown to have combined advantageous properties of their metallic constituents. However, the research on the electrical properties of colloidal nanoalloys is still lacking. We report an electrical properties study of gold-silver nanoalloys of various compositions suspended in Milli-Q water using impedance spectroscopy....

Deltamethrin pesticides can cause inflammation, nephrotoxicity and hepatotoxicity as well as affect the activity of antioxidant enzymes in tissues. As a result of this concern, there is a rising focus on the development of fast and reliable pesticide residue testing to minimise potential risks to humans. The goal of this study is to use Au-Ag collo...

This study investigated the effect of molar concentration of colloidal silver nanoparticles that enhanced Raman signal on Surface-Enhanced Raman Scattering (SERS) substrate performance. Colloidal silver nanoparticles were fabricated as SERS substrate on a glass microscope using drop-casting method. Colloidal silver nanoparticles have been synthesiz...

In this work we investigated the optical and electrical properties of Au-Ag nanoalloys in various volume ratios. The nanoparticles have been prepared from gold and silver ions reduced by direct irradiation femtosecond laser. The samples were added into a quartz cuvette and irradiated for 10 minutes. Each sample was observed the optical property whe...

Au-Ag nanoalloys have been successfully synthesized using femtosecond laser from the colloidal mixture of gold nanoparticles (Au NPs) and silver nanoparticles (Ag NPs). In the formation of Au-Ag nanoalloys, there was a phenomenon of laser melting and alloying. Au nanoparticles and Ag nanoparticles were prepared and were mixed with different composi...

Sari. Pestisida banyak digunakan petani untuk mencegah hama pada proses penanaman daun teh, padahal jika tertelan manusia bisa menimbulkan banyak penyakit. Kita perlu mempelajari metode yang mudah untuk mendeteksi kandungan pestisida. Pada penelitian ini, pestisida deltamethrin pada daun teh dideteksi dengan menggunakan alat spektroskopi Raman. Dau...

Au-Ag nanoalloys have been synthesized using the photochemical reduction method by femtosecond laser from dissolving of potassium gold (III) chloride (KAuCl 4 ) and silver nitrate (AgNO 3 ) added into a quartz cuvette in various volume ratios with a total volume of 3 ml. The samples were then called Au x Ag y , where x and y were the volume fractio...

Van der Waals attraction between nanoparticles will create aggregation, therefore, adding a capping agent is needed to stabilize the nanoparticles. We have synthesized Au50Ag50 nanoalloys from a mixture of silver and gold metal ions using a femtosecond laser irradiated for 5, 10, and 15 minutes. The process occurred in a water-only medium and in a...

Au-Ag nanoalloys have been synthesized by laser irradiation technique. First, Au and Ag nanoparticles were prepared from Au and Ag pure metal (99.9%) ablated using an 800 nm femtosecond laser in distilled water. Using the same laser, Au and Ag nanoparticle with 1:1 ratio were subsequently mixed and irradiated with various irradiation time, i.e. 0,...

Preliminary analysis of lithium in Lithium Iron Phosphate (LiFePO4) powder using laser induced plasma spectroscopy at low pressure had been done. Recently, LiFePO4–based batteries are widely used in most electric cars and bikes due to less toxic. However, lithium (Li) element is very difficult to detect since it is a very light element. In this wor...

Pure metals Aluminum (Al), Copper (Cu) and Brass (CuZn) have been detected using laser-induced plasma spectroscopy technique using nanosecond laser. A Q-switch pulsed Nd:YAG laser operating at infrared (1064 nm), visible (532 nm) and ultraviolet (355 nm) wavelengths have been used. The energy laser used was 12 mJ and the experiment was carried out...

Micro and nanostructures from nature are very interesting for research and applicable technologies. One of the interesting structures is beetle wing since they have unique optical properties. In this work, the researchers have investigated morphology of nano and microstructure of beetle wing from Eupholus chevrolati species. The research found that...

This paper presents the processing and characterization of electromagnetic radiation absorbing carbon sheets based on polymer. The carbon active made from Indonesia coconut carbon fibers and polymer were prepared for electromagnetic absorbers. Research Center for Physics Indonesian Institute of Sciences (P2F-LIPI) has managed to create a carbon she...

This paper presents the processing and characterization of electromagnetic radiation absorbing carbon sheets based on polymer. The carbon active made from Indonesia coconut carbon fibers and polymer were prepared for electromagnetic absorbers. Research Center for Physics Indonesian Institute of Sciences (P2F-LIPI) has managed to create a carbon she...

Study about thin film production using technique pulsed laser deposition have been done. The Pulsed Laser Deposition (PLD) method has been used for growing thin film of ZrO2 on silicon wafer substrate (111 single crystal, thickness 400μm and diameter 7.5 cm). The target made from Zirconia oxide powder mixing with PVA and press using pressure 100kgN...

A crucial safety measure to be strictly observed in the operation of heavy-water nuclear power plants is the mandatory regular inspection of the concentration of deuterium penetrated into the zircaloy fuel vessels. The existing standard method requires a tedious, destructive, and costly sample preparation process involving the removal of the remain...

An experimental study of double pulse LIBS is performed for the development of highly sensitive and quantitative analysis of Cl and Ca for the strength evaluation of concrete. The two lasers employed are arranged in orthogonal geometry and operated for delayed ablation with delay time of 10 μs, using He ambient gas at atmospheric pressure. The very...

Telah dilakukan analisa mikrostruktur dari thin film ZnO pada substrat Si dan Cu. thin film dibentuk dengan menggunakan teknik berbasis laser yang dikenal dengan Pulsed Laser Deposition (PLD). Laser yang digunakan dalam pembentukan thin film adalah laser Nd-YAG pulsa dengan panjang gelombang 532 nm, energi 75 mJ dan frekuensi 10 Hz. Substrat (Si da...